G.726

Testimonials

G.726

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Codec overview

G.726 speech codec was standardized by ITU-T in 1990. The codec converts a G.711 encoded speech signals sampled at 8 KHz to a 16, 24, 32, or 40 kbps bit-stream respectively and vice-versa. It is based on Adaptive Differential Pulse Code Modulation (ADPCM) algorithm. Annex A allows use of uniform PCM interface at input and output. It is used in VoIP applications.

Salient features

  • Based on ITU-T specification.
  • Optimized ASM/C implementation.
  • Re-entrant implementation.
  • C-callable APIs.
  • Operates on G.711 encoded bit-stream or speech signals sampled at 8 KHz.
  • Support for 16, 24, 32, 40 kbps bit-rates.
  • Support for configurable frame sizes.
  • Support for RTP payload format as specified in RFC 3551.
  • Optional support for VAD/DTX/CNG and PLC modules.
  • The implementation supports both Little-Endian and Big-Endian (on ARM and C64x platforms).
  • Optional support for xDM APIs on TI platforms.

Testing features

  • Tested for bit-exactness with standard as well as a large database of non-standard test vectors.
  • Module is fully interruptible (Maximum interrupt latency on C64x is 6000 cycles).
  • Tested for any illegal memory access by the module (C64x and ARM).
  • Tested for compliance with register preservation requirements.
  • Tested for Input buffer corruption.
  • Tested for I/O buffer alignment requirements.
  • Tested for multi-instance implementation.
  • Tested for 100% code coverage.
  • Range validation for all the API parameters.
  • Tested with scratch contamination at frame boundaries.
  • ARM implementation validated on OMAP3530 (Cortex-A8) and DM6446/DM6467 (ARM926EJ-S) platforms.
  • TI C64x implementation validated on Spectrum Digital C6416 DSK.
  • TI C55x implementation validated on Spectrum Digital C5510 DSK.

Available Platform(s)

ARM9E, ARM11, Cortex-A8, Cortex-A9, TI C55x, and TI C64.

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