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G.729

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The One-Stop-Shopping the Telecommunication Industry Has Been Waiting For!

The G.729 IPR Pool is the outcome of the Sipro Lab Telecom vision of one-stop-shopping for intellectual property rights (IPR) relative to specific telecommunication standards. Many industry leaders adhere to the Sipro G.729 one-stop-shopping concept. Prior to establishment of the Pool, the complexity of negotiating IPRs with each intellectual property owner discouraged potential integrators. Now, thanks to the G.729 IPR Pool, integrators have centralized access to G.729 IPRs, which significantly contributes to the emergence of this high-end line of codecs.

The technical community recognizes the G.729 standard as a major advance in the field of digital audio compression. Benefiting immediately from this state-of-the-art standard are applications like conferencing, voice over fax, voice over IP, voice over ATM, voice over frame relay, cellular phones, and other applications where quality, delay, and bandwidth are central.

On behalf of the IPR owners, Sipro Lab Telecom is mandated to centralize and administer the licensing process for rights to G.729 in accordance with ITU-T policies as well as to promote wider acceptance of this state-of-the-art standard. Sipro Lab Telecom thus acts as an intermediary between owners and licensees, representing the rights of the IPR owners regarding licensees and the concerns of licensees regarding the IPR owners. Sipro Lab Telecom facilitates the negotiation of licenses from commercial and legal perspectives while offering technical expertise whenever necessary.

G.729: multi-purpose ITU-T standard for increased bandwidth availability and short delay
In November 1995, the G.729 standard, also referred to as CS-ACELP® (Note 1), was adopted by the International Telecommunication Union, a United Nations organization. Like the G.728 standard, the G.729 algorithm speech codec is based on the renowned Code Excited Linear Prediction (CELP) model. Similar in quality to 32 Kbps ADPCM, G.729 offers toll-quality speech at only 8 Kbps, creating opportunities for significant increases in bandwidth utilization to existing telephony and wireless applications. Operating on 10 ms frames, this multi-purpose standard also allows moderate transmission delays.

As a proven standard, G.729 is being widely adopted in many new VoIP applications. The benefits of toll-quality speech at 8 Kbps, with moderate delay and processing requirements, make G.729 popular in applications like Internet Telephony, web collaboration tools, and visual telephony, where quality, delay, and bandwidth are key.

G.729 Annex A: Digital Simultaneous Voice & Data (DSVD)
In 1995, the top industry players turned to the ITU-T to rule on an international standard in the matter of Digital Simultaneous Voice & Data (DSVD). At the time, there were many speech codecs in use in the modem market, and this standard reduced the confusion and led the way toward signal uniformity and compatibility.

The DSVD system also opened the door to voice over fax, voice over Internet, and voice e-mail. The codec, established as the official DSVD international standard by the ITU-T, was presented by the Université de Sherbrooke from Canada in collaboration with Sipro Lab Telecom Inc., their commercial representative. The toll-quality codec is known as the G.729 Annex A (G.DSVD) standard and is based on the renowned ACELP® (Note 1) system and its unique code book search, conceived by the Université de Sherbrooke.


This 8 Kbps codec offers remarkable features such as:

  • Low complexity (MIPS, RAM, ROM)
  • Low delay (10ms)
  • Toll quality (Note 2)
  • Interoperability with G.729

Interoperability with G.729 is hardly negligible, as G.729—one of the most prestigious ITU-T standards—is on its way to becoming the worldwide standard for the telephone industry. Furthermore, interoperability has the advantage of eliminating the need for transcoding, thus preserving and maximizing signal quality. The standard for video conferencing on POTS (H.324) includes an escape sequence to use G.729 as an optional codec, thereby making all multimedia systems compatible with G.729 Annex A.

Standards
Bit rate (kbit/s)
Implementation
Description
Comments
G.729
8
Fixed-point
Main body
--
Annex A
8
Fixed-point
Low complexity version, DSVD
(Digital Simultaneous Voice and Data)
--
Annex B
8/1.6/0
Fixed-point
VAD/DTX/CNG
Two codes:
G.729 & G.729A
Annex C
8
Floating-point
Only G.729 & G.729A
Annex B not included in
floating-point
Annex D
6.4
Fixed-point
Integrated with G.729
8/6.4
(Annex B not included)
Annex E
11.8
Fixed-point
Integrated with G.729
11.8/8
(Annex B not included)
Annex C+
11.8/8/6.4/1.6/0
Floating-point
All above Annexes integrated
Rate switching on frame basis, all rates with or without Annex B
Annex F
8/6.4/1.6/0
Fixed-point
Annexes D+B
Integrating VAD/DTX/CN
to Annex D
Annex G
11.8/8/1.6/0
Fixed-point
Annexes E+B
Integrating VAD/DTX/CN
to Annex E
Annex H
11.8/8/6.4
Fixed-point
Annexes D+E
(whitout Annex B)
Rate switching on frame basis, all rates with or without Annex B
Annex I
11.8/8/6.4/1.6/0
Fixed-point
All rates integrated
Similar to Annex C+
Rate switching on frame basis, all rates with or without Annex B


LICENSING PROGRAMS
AMR-WB
AMR-WB+
G 711 Appendix III
G.711.1
G 711.1 Appendix I
G 722 Appendix IV
G.723.1
G.729
G.729.1
W-CDMA

PATENT CALLS
3GPP W-CDMA
ITU-T G.729.1
ITU-T G.711.1
ITU-T G.711.0
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