G.729AB Speech Codec

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Tensilica’s G.729AB Speech Application Package

The G.729AB speech codec, used in Voice over IP (VoIP) applications, is fully compliant with ITU (International Telecommunication Union) specifications for the G.729 standard with annexes A and B. As an ITU standard, G.729 is one of the most tested and lowest bandwidth digital speech transmission standards.

The G.729 data compression algorithm compresses voice audio at low bit rates, offering opportunities for significant increases in bandwidth utilization in existing telephony applications. Tensilica's codec implements G.729A, which is compatible with G.729 but requires less computation, and G.729B, which is a silence compression scheme with Discontinuous Transmission (DTX), Voice Activity Detection (VAD), Comfort Noise Generator (CNG) and Silence Insertion Descriptor (SID).

Feature Summary

  • Implements G.729A and G.729B speech compression

Specifications - 8 Kbps


Clock Rate*
Code Size (ROM)
Table Size (ROM)
Total RAM**
13.7 MHz 36 Kbytes 6 Kbytes 8.7 Kbytes

* Average MHz required for single-cycle memory.
**Total RAM includes persistent, stack and scratch

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