G.723.1 Speech codec by CONSILIENT TECHNOLOGIES PVT LTD

Audio and Voice Solutions

Product Description

This coder has two bit rates, 5.3 and 6.3 Kbps.  Both bit rates share the same short-term analysis techniques for processing the speech.  For long-term analysis of speech, the algorithms used are different.  For 5.3 Kbps coder, Algebraic Code Excited Linear Prediction (ACELP) principles are used where as in 6.3 Kbps coder, Multi Pulse-Maximum Likelihood Quantization (MP-MLQ) techniques are used.

The coder works on a frame of 240 speech samples (30 msec).  Besides, there is a look ahead of 60 samples (7.5 msec).  So the total algorithmic delay for the coder is 37.5 msec.

Features

• Fully compatible/bit-exact with the ITU-T G.723.1 standard with Annex A, version 5.1, with discontinuous transmission (DTX) support, using Voice Activity Detection (VAD) and Comfort Noise Generation (CNG).
• Works in little endian mode.  The system should be configured for little endian mode.
• Front-end high pass filter in encoder and post filter in decoder can be enabled or disabled at the time of channel initialization.
• Coder bit rate selection (6.3 or 5.3 Kbps) and 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.
• Relocatable program and data spaces.  Static (state) and scratch data spaces are dynamically relocatable.  Program and table data spaces can be fragmented.
• The code is interruptible and re-entrant. It can be used in systems with multi threaded software architecture.
• Fully optimised to ARM architectures

 

 

G.723.1 Speech codec

Market Segment(s)

• Embedded
• Mobile

Target Platform(s)

• Android
• Linux
• Other OS

ARM Processor(s)

• ARM926EJ-S
• Cortex-A8
• Cortex-A9
• ARMv5

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