G.729AB

ITU-T recommendation G.729 annex A (referred as G.729A) is the reduced complexity version of G.729 recommendation and operates at 8 kbits/sec. G.729A uses Conjugate-Structure Algebraic-Code-Excited Linear Prediction (CS-ACELP) to compress speech sampled at 8khz to 8kbps. The coder operates on 10ms frames with an algorithmic delay of 15 ms. Annex B implements silence compression techniques (Voice Activity Detection (VAD) algorithms and Comfort Noise) to reduce the transmitted bit rate during the silent intervals of speech.

Technical Specification

• Bit rate of 8 kbps at 8 khz sampling rate
• Voice Activity Detection / Comfort Noise Generation (VAD / CNG)
• C callable API for initialization, encoding and decoding of speech data
• Supports Multi-channel capability
• Optimized implementation
• Bit Compliant with ITU-T test vectors

Applications

• Voice over Internet (VoIP) applications
• Videoconferencing (H.323) systems
• Multimedia services at low bitrate
• Store and forward messaging (voice mail)

Platforms

• Currently supported on TI C64x™ (TMS320C64xx™)and TI C64x+™/DaVinci™ (DM644x™)
• For further details contact mkt@ittiam.com

For a demonstration of G.729AB capabilities contact mkt@ittiam.com