Method and system for tunneling wideband telephony through the PSTN

• US 7,522,586 B2
• Filed: 11/21/2002
• Issued: 04/21/2009
• Est. Priority Date: 05/22/2002
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Unger, Kenneth J
• Primary Examiner(s): Orgad; Edan
• Assistant Examiner(s): Ho; Chuong T
• Application Number:
  US10/300,897
• Publication Number:
  US 20030219009A1
• Time in Patent Office: 2,343 Days
• Field of Search: 370351-357, 370/401, 370/466, 370/521, 370/202, 370/435, 370/442, 370/468, 370/477, 370/328, 379/93.08, 379/188.1, 379/68, 379/7, 379/35, 375/240, 375/240.25, 375/241, 375/242, 375/222, 704/212, 704/500, 704/503, 707/101, 710/68
• US Class Current: 370/356
• CPC Class Codes: G10L 19/173 Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• 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
• CPC Class Codes: H04M 7/124 where PSTN/ISDN interconnects two networks other than PSTN/ISDN

Abstract

A system for tunneling wideband telephony, comprises a communication device configured to produce a compressed wideband audio signal. The compressed wideband audio signal has (i) an audio frequency passband greater than that of an 8 kHz sampled audio signal, and (ii) a compressed data rate that is less than or equal to 64 kbps. The system also includes an apparatus, such as a voice gateway, coupled to the communication device and a data link, including a transcoder bypass configured to convert, without transcoding, the compressed wideband audio signal into a data stream including wideband compressed audio data for transmission over the data link.

Claims

1. A system configured to tunnel a compressed wideband audio data stream through a data link intended for a narrowband audio data stream, comprising:

a first apparatus, comprising

a first transcoder configured to transcode a first compressed wideband audio signal into a narrowband audio data stream, and

a first transcoder bypass configured to convert, without transcoding, the compressed wideband audio signal into a 64 kbps compressed wideband audio data stream for transmission over the data link, wherein the data link is configured to transmit the narrowband audio data stream at a data rate less than or equal to 64 kbps; and

a second apparatus, comprising

a second transcoder configured to transcode the narrowband audio data stream into a second compressed wideband audio signal, and

a second transcoder bypass configured to convert, without transcoding, the 64 kbps compressed wideband audio data stream into the second compressed wideband audio signal wherein a sampling frequency greater than 8 kHz is used to produce a sampled wideband audio signal, which is subsequently encoded to produce the compressed wideband audio signal.

2. The system of claim 1, wherein, the first transcoder is configured to transcode the narrowband audio signal into a transcoded PCM data stream when the transcoder bypass is not configured to convert, without transcoding, the compressed wideband audio signal into the compressed wideband audio data stream.

3. The system of claim 1, further comprising:

a controller for selectively enabling either the first transcoder bypass or the first transcoder.

4. The system of claim 1, wherein the first transcoder bypass is coupled to a PSTN data link, and is configured to transmit the compressed wideband audio data stream over the PSTN data link.

5. The system of claim 1, wherein the first apparatus is a portion of a voice gateway.

6. The system of claim 1, wherein the first compressed wideband audio data stream is one of a TDM data format and a packet data format.

7. A system for tunneling wideband telephony through a data link intended for a narrowband audio data stream, comprising:

a communication device configured to produce a compressed wideband audio signal;

a first apparatus, coupled to the communication device, including a first transcoder and a first transcoder bypass configured to convert, without transcoding, the compressed wideband audio signal into the compressed wideband audio data stream, wherein a sampling frequency greater than 8 kHz is used to produce a sampled wideband audio signal, which is subsequently encoded to produce the compressed wideband audio signal wherein the data link is configured to transmit a narrowband audio data stream at a data rate less than or equal to 64 kbps and is coupled to the first apparatus, and wherein the first apparatus is configured to transmit the compressed wideband audio data stream over the data link

a second apparatus configured to receive the compressed wideband audio data stream from the data link, the second apparatus including a second transcoder bypass configured to convert, without transcoding, the received wideband audio data stream into a compressed wideband audio signal representative of the compressed wideband audio signal produced by the communication device.

8. The system of claim 7, wherein the first transcoder bypass in configured to convert, without transcoding, the compressed wideband audio signal into the compressed wideband audio data stream while maintaining an audio frequency passband of the compressed wideband audio signal.

9. The system of claim 7, wherein the first apparatus further includes a first transcoder for transcoding a narrowband audio signal into a transcoded PCM data stream when the first transcoder bypass is not configured to convert, without transcoding, the compressed wideband audio signal into the compressed wideband audio data stream.

10. The system of claim 7, wherein the compressed wideband audio data stream has a data rate equal to 64 kbps.

11. The system of claim 7, wherein the communication device includes an encoder configured to encode the sampled wideband audio signal into the compressed wideband audio signal.

12. The system of claim 10, wherein the communication device further includes an ADC configured to sample an analog wideband audio signal at the sampling frequency, to produce the sampled wideband audio signal.

13. The system of claim 11, further comprising a PSTN data link coupled to the first apparatus, wherein the first apparatus is configured to transmit the compressed wideband audio data stream over the data link at 64 kbps.

14. The system of claim 7, wherein the first apparatus is a portion of a voice gateway.

15. A system for tunneling wideband telephony through a PSTN data link, comprising:

a first apparatus configured to receive a first compressed wideband audio signal, the first apparatus including a first transcoder and a first transcoder bypass configured to convert, without transcoding, the first compressed wideband audio signal into a compressed wideband audio data stream for transmission through the PSTN data link; and

a second apparatus configured to receive the compressed wideband audio data stream from the PSTN data link, the second apparatus including a second transcoder and a second transcoder bypass configured to convert, without transcoding, the received compressed wideband audio data stream into a second compressed wideband audio signal representative of the first compressed wideband audio signal;

wherein the data link is configured to transmit a narrowband audio data stream at a data rate less than or equal to 64 kbps; and

wherein a sampling frequency greater than 8 kHz is used to produce a sampled wideband audio signal, which is subsequently encoded to produce the first compressed wideband audio signal.

16. The system of claim 15, wherein the first and second apparatuses are respective portions of first and second voice gateways.