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ITU-T G.729

Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)

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Organization: ITU-T
Publication Date: 1 June 2012
Status: active
Page Count: 152
scope:

This Recommendation contains the description of an algorithm for the coding of speech signals at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP). This Recommendation includes an electronic attachment containing reference C code and test vectors for fixed-point implementation of CS-ACELP at 8 kbit/s.

The ITU-T G.729 coder is designed to operate with a digital signal obtained by first performing telephone bandwidth filtering specified by [ITU-T G.712] of the analogue input signal, then sampling it at 8 000 Hz, followed by conversion to 16-bit linear pulse code modulation (PCM) for the input to the encoder. The output of the decoder should be converted back to an analogue signal by similar means. Other input/output characteristics, such as those specified by [ITU-T G.711] for 64 kbit/s PCM data, should be converted to 16-bit linear PCM before encoding, or from 16-bit linear PCM to the appropriate format after decoding. The bit stream from the encoder to the decoder is defined within this Recommendation.

This Recommendation is organized as follows: clause 2 gives a general outline of the CS-ACELP algorithm. Clauses 3 and 4 discuss the CS-ACELP encoder and decoder principles, respectively. Clause 5 describes the software that defines this coder in 16-bit fixed-point arithmetic.

Document History

ITU-T G.729
June 1, 2012
Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)
This Recommendation contains the description of an algorithm for the coding of speech signals at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP). This...
January 1, 2007
Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear prediction (CS-ACELP)
A description is not available for this item.
May 1, 2006
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - General Aspects of Digital Transmission Systems
A description is not available for this item.
April 1, 2006
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - General Aspects of Digital Transmission Systems
A description is not available for this item.
August 1, 2005
Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP) Appendix II: G.729 Annex B Enhancements in Voice-over-IP Applications – Option 1
A description is not available for this item.
August 1, 2005
Coding of speech at 8 kbit/s using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP) Appendix III: G.729 Annex B Enhancements in Voice-over-IP Applications – Option 2
A description is not available for this item.
July 3, 2002
Coding of Speech at 8 Kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - Annex B: A Silence Compression Scheme for G.729 Optimized for Terminals Conforming to Recommendation V.70.
A description is not available for this item.
July 3, 2002
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP) Annex C+: Reference Floating-Point Implementation for Integrating G.729 CS-ACELP Speech Coding Main Body with Annexes B, D and E
A description is not available for this item.
July 2, 2002
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP)-Annex F: Referenced Implementation of G.729 Annex B DTX Functionality for Annex D.
A description is not available for this item.
July 2, 2002
Coding of Speech at 8 kbit/s Using Conjugate Structure Algebraic Code-Excited Linear Prediction (CS-ACELP) Annex I: Referenced Fixed-Point Implementation for Integrating G.729 CS-ACELP Speech Coding Main Body with Annexes B,D&E Series G: Transmission Systems and Media, Digital Systems and Networks Digital Transmission Systems-Terminal Equipments-Coding of Analogue Signals by Methods Other Than PCM
A description is not available for this item.
July 2, 2002
Coding of Speech at 8 kbit/s Using Conjugate Structure Algebraic Code-Excited Linear Prediction (CS-ACELP) Annex G: Reference Implementation of G.729 Annex B DTX Functionality for Annex E.
A description is not available for this item.
June 1, 2001
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) Appendix 1: External Synchronous Reset Performance for G.729 Codecs in Systems using External VAD/DTX/CNG Series G: Transmission Systems and Media, Digital Systems and Networks Digital Terminal Equipments - Coding od Analogue Signals by Methods other than PCM
A description is not available for this item.
February 1, 2000
Coding of Speech at 8 kbit/s Using Conjugate Structure Algebraic Code-Excited Linear Prediction (CS-ACELP) Annex H: Referenced Implementation of Switching Procedure between G.729 Annexes D and E Series G: Transmission Systems and Media, Digital Systems and Networks Digital Transmission Systems - Terminal Equipments - Coding of Analogue Signals by Methods Other Than PCM
A description is not available for this item.
September 1, 1998
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - Annex E: 11.8 kbit/s CS-ACELP Speech Coding Algorithm
A description is not available for this item.
September 1, 1998
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - Annex C: Reference Floating-Point Implementation for G.729 CS-ACELP 8 kbit/s Speech Coding - Series G: Transmission Systems and Media, Digital Systems and Networks - Digital Transmission Systems - Terminal Equipments - Coding of Analogue Signals by Methods Other Than PCM
A description is not available for this item.
September 1, 1998
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - Annex D: 6.4 kbit/s CS-ACELP 8 kbit/s Speech Coding Algorithm
A description is not available for this item.
November 1, 1996
Coding of Speech at 8 Kbit/s Using Conjugate Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - Series G: Transmission Systems and Media Digital Transmission Systems - Terminal Equipments - Coding of Analogue Signals by Methods Other Than PCM
A description is not available for this item.
January 1, 1996
Coding of Speech at 8 kbit/s Using Conjugate-Structure Algebraic-Code-Excited Linear-Prediction (CS-ACELP) - General Aspects of Digital Transmission Systems
A description is not available for this item.

References

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