CIT_G723.1A by CouthIT

Audio and Voice Solutions

Product Description

Product Overview:

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.


For most current information on the performance specifications and availability of developed implementation on ARM cores, please send in your enquiry to info@couthit.com

CIT_G723.1A

Market Segment(s)

• Embedded
• Enterprise
• Home
• Mobile

Target Platform(s)

• Android
• Linux
• Windows Embedded CE

ARM Processor(s)

• ARM926EJ-S
• ARM946E-S
• ARM966E-S
• ARM968E-S
• ARM1136J-S
• ARM1136JF-S
• ARM1156T2(F)-S
• ARM1176JZ(F)-S
• ARM11 MPCore
• Cortex-A53
• Cortex-A57
• Cortex-A8
• Cortex-A9
• ARMv5
• ARMv6
• ARMv7
• ARMv8

 Contact Us