Internet telephony signal conversion

• US 6,195,358 B1
• Filed: 08/19/1997
• Issued: 02/27/2001
• Est. Priority Date: 03/15/1997
• Status: Expired due to Term

• Current Assignee: Oath Inc. (Verizon Communications Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: Davies, Simon Robert, Bowater, Ronald John, Porter, Lawrence Leon, Thomas, Mark George Stewart Reid
• Primary Examiner(s): Pham, Chi H.
• Assistant Examiner(s): YAO, KWANG BIN
• Application Number:
  US08/914,111
• Time in Patent Office: 1,288 Days
• Field of Search: 370/212, 370/213, 370/276, 370/294, 370/357, 370/353, 370/354, 370/355, 370/356, 370/401, 370/465, 370/466, 370/467, 370/468
• US Class Current: 370/401
• CPC Class Codes: H04L 69/08 Protocols for interworking; Protocol conversion
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04M 2201/40 using speech recognition
• CPC Class Codes: H04M 2201/60 Medium conversion
• CPC Class Codes: H04M 3/56 Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities video conference systems H04N7/15
• CPC Class Codes: H04M 7/006 Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42

Abstract

The disclosure concerns a method of processing Internet telephony messages at gateway computer such as an IBM RISC/6000 system, comprising the steps of: receiving an Internet telephony message in a first compression scheme from a computer running an Internet telephone software application which uses the first compression scheme; converting the Internet telephony message into a compression scheme optionally via an intermediate format; sending the Internet message telephony to another computer running another Internet telephone software application using the second format.

Claims

1. A method of processing, at a voice processing gateway system, an internet telephony message comprising voice data said method comprising the steps of:

receiving said message in accordance with the Internet Protocol at said gateway system in a first internet telephony format from a first computer connected to the internet;

performing on a digital signal processor channel at said gateway system a first conversion of the message from the first internet telephony format to an intermediate format in conformity with the internal processing of said gateway system;

performing on an adjacent digital signal processor channel at said gateway system a second conversion of the message from the intermediate format to a second format said second format being a different format to said first format whereby said second conversion is not a conversion back to said first format but a conversion to a format different to said first format;

sending from said gateway system in accordance with the Internet Protocol the message in the second format to a second computer connected to the internet.

2. A method according to claim 1 wherein the intermediate format is a non internet voice data format.

3. A method according to claim 1 wherein the intermediate format is Pulse Code Modulation.

4. A method according to claim 1 wherein the converting is performed by a single Digital Signal Processor (DSP) having at least two processing channels.

5. A method according to claim 1 wherein the converting is performed by a first and second digital processor within the same gateway system.

6. A method according to claim 5 wherein the first DSP converts the first formatted first message into the intermediate format and the second DSP converts the intermediate formatted message into the second format.

7. A method according to claim 1 wherein the converting is performed at a node intermediate the first and second computer network telephones.

8. A method according to claim 7 wherein the message is a first message and a second message in the second format is received from the second computer network, the second format is converted into the first format and the second message is sent to the first computer network for two way communication.

9. A method according to claim 8 wherein the respective formats of the first and second messages are converted simultaneously for full duplex communication.

10. A method according to claim 9 wherein the respective formats of the first and second messages are converted to a third format and messages having the third format are sent to a third computer network telephone and a third message is converted from a third format into said first and second format and sent to said first and second computer network telephone respectively for conference communication.

11. A method according to claim 1 wherein the DSPs communicate with each other over a dedicated bus connecting them.

12. A method according to claim 11 wherein the dedicated bus is a Time Division Multiplexed bus (TDM).

13. A method according to claim 1 wherein the DSPs communicate with each other through voice channels routed through a private branch switch (PBX).

14. A method according to claim 1 wherein the intermediate message is an uncompressed digital message.

15. A method according to claim 1 wherein the message is a voice message and the step of converting is a voice recognition step that converts the voice message into text and whereby the second format is a text format.

16. A method according to claim 1 wherein the message is a voice message and the step of converting the message from the intermediate format into the second format is a voice recognition step that converts the voice message into text.

17. A method according to claim 1 wherein said message is a voice message and said method comprises a further conversion step that converts the message from its intermediate format into text.

18. A method as claimed in claim 17 wherein said message is sent to the second computer network telephone in the second format and as text.

19. A method according to claim 1 wherein the method further comprises:

identifying the internet telephony format of the first computer; and

selecting an appropriate algorithm from a plurality of conversion algorithms to perform said first conversion.

20. A method according to claim 1 wherein the method further comprises identifying the internet telephony format of the second computer;

and

selecting an appropriate algorithm from a plurality of conversion algorithms to perform said second conversion.

21. A voice processing gateway system for processing an internet telephony message, said message comprising voice data said system comprising:

means for receiving said message in accordance with the Internet Protocol in a first internet telephony format from a first computer connected to the internet;

means for performing on a digital signal processor channel a first conversion of the message from the first internet telephony format to an intermediate format in conformity with the internal processing of said gateway system;

means for performing on an adjacent digital signal processor channel a second conversion of the message from the intermediate format to a second internet telephone format said second format being a different format to said first format whereby said second conversion is not a conversion back to said first format but a conversion to a format different to said first format; and

means for sending in accordance with the Internet Protocol the message in the second format to a second computer connected to the internet.

22. A system according to claim 21 further comprising:

a plurality of conversion algorithms for converting an internet telephony message from one of a plurality of formats to said intermediate format;

means for identifying the internet telephony format of the first computer and selecting the appropriate algorithm to perform the first conversion; and

means for identifying the internet telephony format of the second computer and selecting the appropriate format to perform the second conversion.