Consilient's G.729AB by CONSILIENT TECHNOLOGIES PVT LTD

Audio and Voice Solutions

Product Description

G.729 Annex A with Annex B (G.729AB) is a low bit rate speech coder standard from International Telecommunication Union–Telecommunication standardization sector (ITU-T), for compressing toll quality speech (8000 samples/second).  G.729AB is algorithmically simpler to G.729.  The coders G.729 and G.729A are inter-operable, i.e., G.729 packet can be decoded by G.729A decoder and vice versa.  The typical applications of this speech coder are in telephony over packet networks, like Voice-over-Internet-Protocol (VoIP).  This is a very robust speech coder, with very good speech quality comparable to 32 Kbps ADPCM coder.

This coder works at bit rate of 8000 bits/second.  Like G.729 Codec, G.729AB is also based on the principle of Complementary Symmetry - Algebraic Code Excited Linear Prediction (CS-ACELP).  The coder works on a frame of 80 speech samples (10 msec).  Besides, there is a look ahead of 40 samples (5 msec).  So the total algorithmic delay for the coder is 15 msec.

Features

• Fully compatible/bit-exact with the ITU-T G.729A standard with Annex B, version 1.3, with discontinuous transmission (DTX) support, using Voice Activity Detection (VAD) and Comfort Noise Generation (CNG).
• DTX (VAD/CNG) enabling or disabling can be done on a frame basis.
• Full duplex multi-channel capability.
• Flexible interface with ‘C’ callability, with a single archive file for all functions.
• Built-in scratch memory management to avoid run-time overloading of system stack memory.
• The code is interruptible and frame re-entrant. It can be used in systems with multi threaded software architecture.

Consilient's implementation has been optimised for minimum Mhz for both ARM9E and NEON based platforms.

 

Consilient's G.729AB

Market Segment(s)

• Embedded
• Enterprise
• Mobile
• Mobile Computing

Target Platform(s)

• Android
• Other OS

ARM Processor(s)

• ARM926EJ-S
• Cortex-A8
• ARMv5
• ARMv6
• ARMv7

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