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G.723.1A speech codec was standardized by ITU-T in 1996. The codec operates on each 30ms frame of 16-bit speech signals sampled at 8 KHz and generates a compressed bit-stream having bit-rates of 5.3 and 6.3 kbps respectively. It has a look-ahead delay of 7.5 ms and uses algebraic code excited linear prediction (ACELP) algorithm for the low bit-rate and Multi-Pulse Maximum Likelihood Quantization (MP-MLQ) algorithm for the high bit-rate modes. Annex A of the standard specifies a voice activity detection algorithm as well the discontinuous transmission mode of operation. The decoder supports an inherent packet loss concealment algorithm. Support for this codec is mandatory for ITU-T H.324 terminals offering audio communication. It is also widely used in VoIP applications.
Salient Features (of CouthIT implementation):
– Based on ITU-T specification.
– Optimized ASM/C implementation.
– Re-entrant implementation.
– C-callable APIs.
– Operates on speech signals sampled at 8 KHz.
– Support for 5.3 and 6.3 kbps bit-rates.
– Support for swapping the bit-rates at frame boundary.
– Support for optional high-pass filter configurable at init-time.
– Support for RTP payload format as specified in RFC 3551.
– Supports integrated DTX mode of operation configurable at init-time.
– Optional support for xDM APIs.
– The implementation supports both Little-Endian and Big-Endian (on ARM platform).
– Supports integrated Packet Loss Concealment (PLC) algorithm.
– Support for bad frame indication (CRC) at frame boundary.
– Support for post-filter operation, configurable at frame boundary.
Scope of Testing:
– Tested for bit-exactness with standard as well as a large database of non-standard test vectors.
– Tested for any illegal memory access by the module (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.
– Tested for packet loss conditions with 5% loss to 25% loss.
– ARM implementation validated on OMAP3530 (Cortex-A8) and DM6446/DM6467 (ARM926EJ-S) platforms.
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