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Audio band signal transmission system and method Number:6,751,215 from the United States Patent and Trademark Office (PTO) owispatent

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Title: Audio band signal transmission system and method

Abstract: An identification number inserting portion 26 in a multiplexing portion 33 in an audio transmission system 10 inserts a connection identification number for own connection into an audio band signal cell which is to be transmitted via an up line 60. An identification number detecting portion 30B detects that the connection identification number is transmitted again from a switching system 1 to the audio transmission system 10 via a down line 70. When an identification number detecting portion 30 confirms based on this detection that a communication path is extended in sequence over 37 the audio transmission system 10, the switching system 1, and the audio transmission system 10", it controls a slot/channel number converting portion 22 and a change-over switch to correct a routine such that a cell which is to be transmitted the up line 60 in the multiplexing portion 33 can be transmitted to a cell multiplexing portion 34 via a change-over switch 23 on the up line 60, a slot/channel number converting portion 22, and a change-over switch on the down line 70.

Patent Number: 6,751,215 Issued on 06/15/2004 to Kawanobe,   et al.


Inventors: Kawanobe; Takeshi (Kanagawa, JP), Suganuma; Toshiya (Kanagawa, JP), Aoki; Masao (Kanagawa, JP), Fuse; Hidetoshi (Kanagawa, JP)
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Appl. No.: 09/593,325
Filed: June 13, 2000


Foreign Application Priority Data

Sep 01, 1999 [JP] 11-247975

Current U.S. Class: 370/352 ; 370/412; 370/477; 710/68
Current International Class: H04Q 11/04 (20060101)
Field of Search: 370/352-356,400,401,386,375,389,477,428,429,412-418


References Cited [Referenced By]

U.S. Patent Documents
6600741 July 2003 Chrin et al.
6628652 September 2003 Chrin et al.
Foreign Patent Documents
9-55753 Feb., 1997 JP
9-261239 Mar., 1997 JP
10-23573 Jan., 1998 JP
Primary Examiner: Pezzlo; John
Attorney, Agent or Firm: Pearne & Gordon LLP

Claims



What is claimed is:

1. An audio band signal transmission system having an audio transmission system which is arranged between a switching system and a cell switching system, and transmits an audio band signal comprising a plurality of audio band signal cells via an up line from the cell switching system to the switching system and a down line from the switching system to the cell switching system for each one of a plurality of connections, and has a cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line, comprising, for each of said plurality of connections: a connection identification number inserting portion of the audio transmission system for setting a connection identification number which identifies the connection, and for inserting said connection identification number into an audio band signal cell which is to be transmitted to the switching system via the up line for the connection; a connection identification number detecting portion of the audio transmission system for detecting the connection identification number contained in the audio band signal cell which is to be transmitted from the switching system via the down line for the connection; and

a routine correcting portion of the audio transmission system for correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for the connection in response to a predetermined control signal, is input into the connection identification number inserting portion corresponding to the connection, to thus transmit the audio band signal cell via the down line corresponding to the connection without intervention of the switching system and the cell delay variation absorbing buffer; wherein, when the connection identification number detecting portion of one of the plurality of connections detects another connection identification number of another one of the plurality of connections via the down line for the connection, the connection identification number detecting portion instructs the connection identification number detecting portion of the other connection to output the predetermined control signal.

2. An audio band signal transmission system according to claim 1, wherein the audio transmission system includes, a switching system interface portion of the audio transmission system for transmitting the audio band signal between the switching system and the audio transmission system, a transmission line interface portion of the audio transmission system for transmitting the audio band signal between the cell switching system and the audio transmission system, and a multiplexing portion of the audio transmission system arranged between the switching system interface portion and the transmission line interface portion, for transmitting the audio band signal between the switching system and the cell switching system, wherein the switching system interface portion has the cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line.

3. An audio band signal transmission system according to claim 2, wherein the multiplexing portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion for each of the plurality of the connections, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to the connection when it confirms in response to the instruction from the other connection identification number detecting portion that a communication path for the connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to transmit the audio band signal to the down line without intervention of the switching system interface portion and the switching system.

4. An audio band signal transmission system according to claim 3, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the audio transmission system for compressed-coding the audio band signal transmitted from the switching system via the down line, and a compressed decoding portion of the audio transmission system for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

5. An audio band signal transmission system according to claim 2, wherein the switching system interface portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion arranged at a preceding stage of the cell delay variation absorbing buffer for each of the plurality of connections, the connection identification number detecting portion outputs a predetermined control signal to the routine correcting portion which corresponds to the connection when it confirms that a communication path for the connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the cell delay variation absorbing buffer and the switching system.

6. An audio band signal transmission system according to claim 5, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system interface for compressed-coding the audio band signal which is transmitted from the switching system via the down line to then transmit a compressed-coded audio band signal to the connection identification number detecting portion, and a compressed decoding portion of the switching system interface for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

7. An audio band signal transmission system according to claim 2, wherein the transmission line interface portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when the connection identification number detecting portion confirms in response to the instruction from the other connection identification number detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the multiplexing portion, the switching system interface portion, and the switching system.

8. An audio band signal transmission system according to claim 7, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

9. An audio band signal transmission system according to claim 1, wherein the cell switching system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number detecting portion that a communication path for connection is extended in sequence over the cell switching system, the audio transmission system, the switching system, the audio transmission system, and the cell switching system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to then transmit the audio band signal to the down line without intervention of the audio transmission system and the switching system.

10. An audio band signal transmission system according to claim 9, wherein the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

11. An audio band signal transmission system having an audio transmission system which is arranged between a switching system and a cell switching system, and transmits an audio band signal comprising a plurality of audio band signal cells via an up line from the cell switching system to the switching system and a down line from the switching system to the cell switching system for each of a plurality of connections, and has a cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line, comprising, for each of the plurality of connections: a connection identification number cell transmitting portion of the audio transmission system setting a connection identification number which is to be identified, and transmitting a control cell containing the connection identification number, which is paired with the audio band signal cell, separately from the audio band signal cell which is to be transmitted to the switching system via the up line for the connection; a connection identification number cell detecting portion of the audio transmission system detecting a control cell which is paired with the audio band signal cell to be transmitted from the switching system via the down line for the connection, and then detecting the connection identification number contained in the control cell; and a routine correcting portion of the audio transmission system for correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for connection in response to a predetermined control signal, is input into the connection identification number cell transmitting portion corresponding to this connection, to thus transmit the audio band signal cell via the down line corresponding to this connection without intervention of the switching system and the cell delay variation absorbing buffer; wherein, when the connection identification number cell detecting portion of the connection identification number detecting portion for one of the plurality of connections detects another connection identification number of another one of the plurality of connections via the down line for the connection, the connection identification number cell detecting portion instructs the connection identification number cell detecting portion of the other connection to output the predetermined control signal.

12. An audio band signal transmission system according to claim 11, wherein the audio transmission system includes, a switching system interface portion for transmitting the audio band signal between the switching system and the audio transmission system, a transmission line interface portion for transmitting the audio band signal between the cell switching system and the audio transmission system, and a multiplexing portion arranged between the switching system interface portion and the transmission line interface portion, for transmitting the audio band signal between the switching system and the cell switching system, wherein the switching system interface portion has the cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line.

13. An audio band signal transmission system according to claim 12, wherein the multiplexing portion of the audio transmission system contains a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to transmit the audio band signal to the down line without intervention of the switching system interface portion and the switching system.

14. An audio band signal transmission system according to claim 13, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

15. An audio band signal transmission system according to claim 12, wherein the switching system interface portion of the audio transmission system contains, for each of the plurality of connections, a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion arranged at a preceding stage of the cell delay variation absorbing buffer, the connection identification number cell detecting portion outputs a predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in answer to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in answer to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the cell delay variation absorbing buffer and the switching system.

16. An audio band signal transmission system according to claim 15, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line to then transmit a compressed-coded audio band signal to the connection identification number cell detecting portion, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

17. An audio band signal transmission system according to claim 12, wherein the transmission line interface portion of the audio transmission system contains a connection identification number cell transmitting portion, connection identification number cell detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the multiplexing portion, the switching system interface portion, and the switching system.

18. An audio band signal transmission system according to claim 17, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

19. An audio band signal transmission system according to claim 11, wherein the cell switching system contains a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to then transmit the audio band signal to the down line without intervention of the audio transmission system and the switching system.

20. An audio band signal transmission system according to claim 19, wherein the audio transmission system includes, a compressed coding portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

21. An audio band signal transmission method of transmitting an audio band signal comprising a plurality of audio band signal cells via an up line from a cell switching system to a switching system and a down line from the switching system to the cell switching system for each of a plurality of connections by using an audio transmission system arranged between the switching system and the cell switching system, and then delayed-reading the audio band signal, which is transmitted via the up line, by using a cell delay variation absorbing buffer in the audio transmission system, comprising, for each of the plurality of connections, the steps of: setting a connection identification number which identifies the connection, and inserting the connection identification number into an audio band signal cell, which is to be transmitted to the switching system via the up line for the connection, by using a connection identification number inserting portion of the audio transmission system; detecting the connection identification number contained in the audio band signal cell, which is to be transmitted from the switching system via the down line for the connection, by using a connection identification number detecting portion of the audio transmission system; correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for the connection in response to a predetermined control signal, is input into the connection identification number inserting portion corresponding to the connection by using a routine correcting portion of the audio transmission system, to thus transmit the audio band signal cell via the down line corresponding to the connection without intervention of the switching system and the cell delay variation absorbing buffer; and instructing the connection identification number detecting portion of one of the plurality of connections, which corresponds to the connection identification number, to output the predetermined control signal by the connection identification number detecting portion of the connection identification number detecting portion for another one of the plurality of connections when the connection identification number detecting portion detects the connection identification number via the down line for the connection.

22. An audio band signal transmission method according to claim 21, wherein the audio transmission system includes, a switching system interface portion of the audio transmission system for transmitting the audio band signal between the switching system and the audio transmission system, a transmission line interface portion of the audio transmission system for transmitting the audio band signal between the cell switching system and the audio transmission system, and a multiplexing portion of the audio transmission system arranged between the switching system interface portion and the transmission line interface portion, for transmitting the audio band signal between the switching system and the cell switching system, wherein the switching system interface portion has the cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line.

23. An audio band signal transmission method according to claim 22, wherein the multiplexing portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to instruction from the connection identification number detecting portion for another one of the plurality of connections that a communication path for the connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to transmit the audio band signal to the down line without intervention of the switching system interface portion and the switching system.

24. An audio band signal transmission method according to claim 23, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system interface portion for compressed-coding the audio band signal transmitted from the switching system via the down line, and a compressed decoding portion of the switching system interface portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

25. An audio band signal transmission method according to claim 22, wherein the switching system interface portion of the audio transmission system contains, for each of the plurality of connections, a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion arranged at a preceding stage of the cell delay variation absorbing buffer, the connection identification number detecting portion outputs a predetermined control signal to the routine correcting portion which corresponds to connection when it confirms that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the cell delay variation absorbing buffer and the switching system.

26. An audio band signal transmission method according to claim 25, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system interface portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line to then transmit a compressed-coded audio band signal to the connection identification number detecting portion, and a compressed decoding portion of the switching system interface portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

27. An audio band signal transmission method according to claim 22, wherein the transmission line interface portion of the audio transmission system contains, for each of the plurality of connections, a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to instruction from the other connection identification number detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the multiplexing portion, the switching system interface portion, and the switching system.

28. An audio band signal transmission method according to claim 27, the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system interface portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion of the switching system interface portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

29. An audio band signal transmission method according to claim 21, wherein the cell switching system contains, for each of the plurality of connections, a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion, the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number detecting portion: that a communication path for connection is extended in sequence over the cell switching system, the audio transmission system, the switching system, the audio transmission system, and the cell switching system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to then transmit the audio band signal to the down line without intervention of the audio transmission system and the switching system.

30. An audio band signal transmission method according to claim 29, wherein the audio transmission system includes, a compressed coding portion of the audio transmission system for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion of the audio transmission system for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

31. An audio band signal transmission method of transmitting an audio band signal comprising a plurality of audio band signal cells via an up line from a cell switching system to a switching system and a down line from the switching system to the cell switching system for each of a plurality of connections by using an audio transmission system which is arranged between the switching system and the cell switching system, and then delayed-reading the audio band signal, which is transmitted via the up line, by using a cell delay variation absorbing buffer in the audio transmission system, comprising, for each of the plurality of connections, the steps of: setting a connection identification number which identifies the connection, and then transmitting a control cell containing the connection identification number, which is paired with the audio band signal cell, separately from the audio band signal cell, which is to be transmitted to the switching system via the up line for the connection, by using a connection identification number cell transmitting portion of the audio transmission system; detecting a control cell which is paired with the audio band signal cell to be transmitted from the switching system via the down line for the connection, and then detecting the connection identification number contained in the control cell, by using a connection identification number cell detecting portion of the audio transmission system; correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for the connection in response to a predetermined control signal, is input into the connection identification number cell transmitting portion corresponding to this connection by using a routine correcting portion of the audio transmission system, to thus transmit the audio band signal cell via the down line corresponding to this the connection without intervention of the switching system and the cell delay variation absorbing buffer; and instructing the connection identification number cell detecting portion of one of the plurality of connections, which corresponds to the connection identification number, to output the predetermined control signal by the connection identification number cell detecting portion of the connection identification number detecting portion of another one of the plurality of connections when the connection identification number cell detecting portion detects the connection identification number via the down line for the connection.

32. An audio band signal transmission method according to claim 31, wherein the audio transmission system includes, a switching system interface portion for transmitting the audio band signal between the switching system and the audio transmission system, a transmission line interface portion of the audio transmission system for transmitting the audio band signal between the cell switching system and the audio transmission system, and a multiplexing portion of the audio transmission system arranged between the switching system interface portion and the transmission line interface portion, for transmitting the audio band signal between the switching system and the cell switching system, wherein the switching system interface portion has the cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line.

33. An audio band signal transmission method according to claim 32, wherein the multiplexing portion of the audio transmission system contains, for each of the plurality of connections, a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to transmit the audio band signal to the down line without intervention of the switching system interface portion and the switching system.

34. An audio band signal transmission method according to claim 33, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the audio transmission system for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion of the audio transmission system for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

35. An audio band signal transmission method according to claim 32, wherein the switching system interface portion of the audio transmission system contains, for each of the plurality of connections, a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion, all are arranged at a preceding stage of the cell delay variation absorbing buffer, the connection identification number cell detecting portion outputs a predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in answer to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in answer to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the cell delay variation absorbing buffer and the switching system.

36. An audio band signal transmission method according to claim 35, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line to then transmit a compressed-coded audio band signal to the connection identification number cell detecting portion, and a compressed decoding portion of the switching system portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

37. An audio band signal transmission method according to claim 32, wherein the transmission line interface portion of the audio transmission system contains a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number cell detecting portion that a communication path for connection is extended in sequence over the audio transmission system, the switching system, and the audio transmission system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus transmit the audio band signal to the down line without intervention of the multiplexing portion, the switching system interface portion, and the switching system.

38. An audio band signal transmission method according to claim 37, wherein the switching system interface portion of the audio transmission system includes, a compressed coding portion of the switching system portion for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion of the switching system portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

39. An audio band signal transmission method according to claim 31, wherein the cell switching system contains a connection identification number cell transmitting portion, a connection identification number cell detecting portion, and a routine correcting portion for each of the plurality of connections, the connection identification number cell detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to connection when it confirms in response to the instruction from the other connection identification number cell detecting portion that a communication path for connection is, extended in sequence over the cell switching system, the audio transmission system, the switching system, the audio transmission system, and the cell switching system, and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to then transmit the audio band signal to the down line without intervention of the audio transmission system and the switching system.

40. An audio band signal transmission method according to claim 39, wherein the audio transmission system includes, a compressed coding portion of the audio transmission system for compressed-coding the audio band signal which is transmitted from the switching system via the down line, and a compressed decoding portion of the audio transmission system for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.
Description



BACKGROUND OF THE INVENTION

The present invention relates to an audio band signal transmission system having an audio transmission system which is arranged between a switching system and a cell switching system to transmit an audio band signal via an up line from the cell switching system to the switching system and a down line from the switching system to the cell switching system every connection, and an audio band signal transmission method.

In the prior art, in transmitting the audio signal, such a system is employed that high-efficiency audio compressed coding/decoding processes are performed so as to achieve effective use of the capacity of lines and also one channel is allocated to an audio compressed signal on one line by using time-division multiplex.

However, according to such time-division multiplex, idleness of the lines is generated since channels are still occupied in their idle state. Therefore, in order to achieve the effective use of the lines by such idleness of the lines, the audio signal is divided into compressed-coded audio frames and then transmitted as cells.

According to such system configuration, the method is utilized which enables other lines to utilize the idle transmission lines by transmitting no cell over the idle transmission lines to thus improve statistically a transmission efficiency.

Meanwhile, since compressed-coding cannot be applied to an audio band data signal employed in FAX, MODEM, etc. unlike the audio signal, the audio band data signal is formulated into the cells without compression and then transmitted as it is. Each cell consists of a header area which indicates supplementary information such as an address, data type, etc. and a data area which contains the compressed-coded audio signal or the audio signal per se.

In such above prior art, if the audio band signal transmission system is composed of a large scale network, as disclosed in Patent Application Publication (KOKAI) Hei 9-261239 as shown in FIG. 22, the audio band signal is transmitted to a telephone 103 as a calling destination to pass through relay principal points of a switching system 102 via an audio transmission system 100 and a transmission line 101. At this time, line switching of the audio is carried out at the relay principal points by the switching system 102.

Therefore, the audio transmission system 100 must absorb cell delay variationcell delay variation by delayed-reading the audio band signal, which is subjected to audio compressed coding by an audio compressed coding portion 2B, by using a cell delay variationcell delay variation absorbing buffer 3B, then decode the audio cells into the original state by audio compressed-decoding the audio band signal, which is subjected to cell delay variation absorption by using an audio compressed decoding portion 1B, and then transfer the decoded audio to the switching system 102.

Therefore, according to such audio band signal transmission system in the prior art, the message can be transferred between these telephones 103 in the communication network for the relay transmission, nevertheless various processes such as the audio compressed coding process, the audio compressed decoding process, the cell delay variation absorbing process, etc. are carried out repeatedly by the audio compressed coding portion 2B, the audio compressed decoding portion 1B, the cell delay variation absorbing buffer 3B, etc. respectively every audio transmission system 100 even if such processes are not needed. As a result, there is such a problem that, because of such useless processes, not only degradation of the audio quality but also the delay time in process is increased.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an audio band signal transmission system and an audio band signal transmission method, which are capable of suppressing a process delay time to the lowest minimum without degradation of audio quality of an audio band signal.

In order to achieve the above object, according to the present invention, there is provided an audio band signal transmission system having an audio transmission system which is arranged between a switching system and a cell switching system, and transmits an audio band signal via an up line from the cell switching system to the switching system and a down line from the switching system to the cell switching system every connection, and has a cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line, comprising a connection identification number inserting portion provided for every connection, for setting a connection identification number which is to be identified every connection, and inserting own connection identification number into an audio band signal cell which is to be transmitted to the switching system via the up line for own connection; a connection identification number detecting portion provided for every connection, for detecting the connection identification number contained in the audio band signal cell which is to be transmitted from the switching system via the down line for own connection; and a routine correcting portion provided for every connection, for correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for own connection in response to a predetermined control signal, is input into the connection identification number inserting portion corresponding to this connection, to thus transmit the audio band signal cell via the down line corresponding to own connection without intervention of the switching system and the cell delay variation absorbing buffer; wherein, when one connection identification number detecting portion of connection identification number detecting portions provided for every connection detects the connection identification number via the down line for own connection, it informs the connection identification number detecting portion which corresponds to the connection identification number to output the predetermined control signal.

Therefore, according to the audio band signal transmission system of the present invention, when it is decided in response to notification issued from other connection identification number detecting portion that the audio band signal cell which is to be transmitted to own connection is transmitted via the communication path which is extended over "the audio transmission system, the switching system, and the audio transmission system" in sequence, the routine of the cell is corrected before the audio band signal cell which is to be transmitted to the switching system via the up line for own connection is input into the connection identification number inserting portion which corresponds to this connection. Hence, the audio band signal cell can be transmitted via the down line corresponding to this own connection, without intervention of the switching system and the cell delay variation absorbing buffer. As a result, a process delay time can be suppressed to the lowest minimum without degradation of the audio quality of the audio band signal by omitting useless processes such as cell disassembling/assembling processes, etc. generated when the cell is transmitted to the switching system, cell delay variation absorbing process by the cell delay variation absorbing buffer, etc.

Also, according to the present invention, there is provided an audio band signal transmission method of transmitting an audio band signal via an up line from a cell switching system to a switching system and a down line from the switching system to the cell switching system every connection by using an audio transmission system arranged between the switching system and the cell switching system, and then delayed-reading the audio band signal, which is transmitted via the up line, by using a cell delay variation absorbing buffer in the audio transmission system, comprising the steps of setting a connection identification number which is to be identified every connection, and inserting own connection identification number into an audio band signal cell, which is to be transmitted to the switching system via the up line for own connection, by using a connection identification number inserting portion provided for every connection; detecting the connection identification number contained in the audio band signal cell, which is to be transmitted from the switching system via the down line for own connection, by using a connection identification number detecting portion provided for every connection; correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for own connection in response to a predetermined control signal, is input into the connection identification number inserting portion corresponding to this connection by using a routine correcting portion provided for every connection, to thus transmit the audio band signal cell via the down line corresponding to own connection without intervention of the switching system and the cell delay variation absorbing buffer; and informing the connection identification number detecting portion, which corresponds to the connection identification number, to output the predetermined control signal by one connection identification number detecting portion of connection identification number detecting portions provided for every connection when such connection identification number detecting portion detects the connection identification number via the down line for own connection.

Therefore, according to the audio band signal transmission method of the present invention, when it is decided in response to notification issued from other connection identification number detecting portion that the audio band signal cell which is to be transmitted to own connection is transmitted via the communication path which is extended over "the audio transmission system, the switching system, and the audio transmission system" in sequence, the routine of the cell is corrected before the audio band signal cell which is to be transmitted to the switching system via the up line for own connection is input into the connection identification number inserting portion which corresponds to this connection. Hence, the audio band signal cell can be transmitted via the down line corresponding to this own connection, without intervention of the switching system and the cell delay variation absorbing buffer. As a result, a process delay time can be suppressed to the lowest minimum without degradation of the audio quality of the audio band signal by omitting useless processes such as cell disassembling/assembling processes, etc. generated when the cell is transmitted to the switching system, cell delay variation absorbing process by the cell delay variation absorbing buffer, etc.

There is provided, as set forth in the first aspect of the present invention, an audio band signal transmission system having an audio transmission system which is arranged between a switching system and a cell switching system, and transmits an audio band signal via an up line from the cell switching system to the switching system and a down line from the switching system to the cell switching system every connection, and has a cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line, comprising: a connection identification number inserting portion provided for every connection, for setting a connection identification number which is to be identified every connection, and inserting own connection identification number into an audio band signal cell which is to be transmitted to the switching system via the up line for own connection; a connection identification number detecting portion provided for every connection, for detecting the connection identification number contained in the audio band signal cell which is to be transmitted from the switching system via the down line for own connection; and a routine correcting portion provided for every connection, for correcting a routine before the audio band signal cell, which is transmitted to the switching system via the up line for own connection in response to a predetermined control signal, is input into the connection identification number inserting portion corresponding to this connection, to thus transmit the audio band signal cell via the down line corresponding to own connection without intervention of the switching system and the cell delay variation absorbing buffer; wherein, when one connection identification number detecting portion out of connection identification number detecting portions provided for every connection detects the connection identification number via the down line for own connection, it informs the connection identification number detecting portion which corresponds to the connection identification number to output the predetermined control signal.

Therefore, according to the audio band signal transmission system set forth in the first aspect of the present invention, when it is decided in response to notification issued from other connection identification number detecting portion that the audio band signal cell which is to be transmitted to own connection is transmitted via the communication path which is extended over "the audio transmission system, the switching system, and the audio transmission system" in sequence, the routine of the cell is corrected before the audio band signal cell which is to be transmitted to the switching system and the cell delay variation absorbing buffer via the up line for own connection is input into the connection identification number inserting portion which corresponds to this connection. Hence, the audio band signal cell can be transmitted via the down line corresponding to this own connection, without intervention of the switching system and the cell delay variation absorbing buffer. As a result, a process delay time can be suppressed to the lowest minimum without degradation of the audio quality of the audio band signal by omitting useless processes such as cell disassembling/assembling processes, etc. generated when the cell is transmitted to the switching system, cell delay variation absorbing process by the cell delay variation absorbing buffer, etc. In this case, the similar advantage can also be achieved by the audio band signal transmission method set forth in the twenty-first aspect of the present invention.

In an audio band signal transmission system set forth in the second aspect of the present invention, in addition to a configuration according to the first aspect of the invention, the audio transmission system includes a switching system interface portion for transmitting the audio band signal between the switching system and the audio transmission system, a transmission line interface portion for transmitting the audio band signal between the cell switching system and the audio transmission system, and a multiplexing portion arranged between the switching system interface portion and the transmission line interface portion, for transmitting the audio band signal between the switching system and the cell switching system, wherein the switching system interface portion has the cell delay variation absorbing buffer for delayed-reading the audio band signal which is transmitted via the up line.

Therefore, according to the audio band signal transmission system set forth in the second aspect of the present invention, the audio transmission system consists of three portions of the switching system interface portion, the transmission line interface portion, and the multiplexing portion. In this case, the similar advantage can also be achieved by the audio band signal transmission method set forth in the twenty-second aspect of the present invention.

In an audio band signal transmission system set forth in the third aspect of the present invention, in addition to a configuration according to the second aspect of the invention, the multiplexing portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion every connection, and the connection identification number detecting portion outputs the predetermined control signal to the routine correcting portion which corresponds to own connection when it confirms in response to notification from other connection identification number detecting portion that a communication path for own connection is extended in sequence over "the audio transmission system, the switching system, and the audio transmission system", and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to transmit the audio band signal to the down line without intervention of the switching system interface portion and the switching system.

Therefore, according to the audio band signal transmission system set forth in the third aspect of the present invention, when it is confirmed in response to notification issued from other connection identification number detecting portion that the communication path for own connection is extended in sequence over "the audio transmission system, the switching system, and the audio transmission system", the routine of the cell is corrected before the audio band signal cell which is to be transmitted to the switching system via the up line for own connection is input into the identification number inserting portion which corresponds to this connection. Therefore, the audio band signal cell can be transmitted via the down line corresponding to this own connection, without the intervention of the switching system interface portion and the switching system. As a result, the process delay time can be suppressed to the lowest minimum without degradation of the audio quality of the audio band signal by omitting useless processes such as the cell disassembling/assembling processes, the cell delay variation absorbing process, etc. generated in the switching system interface portion, the process generated in the switching system, etc. In this case, the similar advantage can also be achieved by the audio band signal transmission method set forth in twenty-third aspect of the present invention.

In an audio band signal transmission system set forth in the fourth aspect of the present invention, in addition to a configuration according to the third aspect of the invention, the switching system interface portion of the audio transmission system includes a compressed coding portion for compressed-coding the audio band signal transmitted from the switching system via the down line, and a compressed decoding portion for compressed-decoding the audio band signal which is delayed-read by the cell delay variation absorbing buffer.

Therefore, according to the audio band signal transmission system set forth in the fourth aspect of the present invention, when it is confirmed in response to notification issued from other connection identification number detecting portion that the communication path for own connection is extended in sequence over "the audio transmission system, the switching system, and the audio transmission system", the routine of the cell is corrected before the audio band signal cell which is to be transmitted to the switching system via the up line for own connection is input into the identification number inserting portion which corresponds to this connection. Therefore, the audio band signal cell can be transmitted via the down line corresponding to this own connection, without the intervention of the switching system interface portion and the switching system. As a result, the process delay time can be suppressed to the lowest minimum without degradation of the audio quality of the audio band signal by omitting useless processes such as the cell disassembling/assembling processes, the cell delay variation absorbing process, and the audio compressed coding/decoding processes in the switching system interface portion, the process generated in the switching system, etc. In this case, the similar advantage can also be achieved by the audio band signal transmission method set forth in the twenty-fourth aspect of the present invention.

In an audio band signal transmission system set forth in the fifth aspect of the present invention, in addition to a configuration according to the second aspect of the invention, the switching system interface portion of the audio transmission system contains a connection identification number inserting portion, a connection identification number detecting portion, and a routine correcting portion, all are arranged at a preceding stage of the cell delay variation absorbing buffer, every connection, the connection identification number detecting portion outputs a predetermined control signal to the routine correcting portion which corresponds to own connection when it confirms that a communication path for own connection is extended in sequence over "the audio transmission system, the switching system, and the audio transmission system", and the routine correcting portion corrects the routine of the audio band signal from the up line in response to the predetermined control signal to thus tra


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