G.722 Wideband codec by CONSILIENT TECHNOLOGIES PVT LTD

Audio and Voice Solutions

Product Description

 Consilient’s G.722

The codec uses sub-band adaptive differential pulse code modulation (SB-ADPCM) within a bit-rate of 64 kbit/s. In the SB-ADPCM technique used, the frequency band is split into two sub-bands (higher and lower) and the signals in each sub-band are encoded using ADPCM.

The system has three basic modes of operation corresponding to the bit rates used for 7 kHz audio coding: 64, 56 and 48 kbit/s. The latter two modes allow an auxiliary data channel of 8 and 16 kbit/s respectively to be provided within the 64 kbit/s by making use of bits from the lower sub-band.

The encoder encodes with 64 kbit/s at all times irrespective of the mode of operation. But for decoder, the input is 64, 56 or 48 kbit/s corresponding to the modes of operation 1, 2 or 3 respectively.

The coder works on a frame of 160 speech samples (10 msec at 16KHz sampling rate)

This firmware fully compatible with the ITU-T G722, and has been tested for compliance with bit-exact test vectors.

Major architectural features are :

• Flexible interface with ‘C’ callability.
• The code is interruptible and frame re-entrant.  This code can be used in systems with multi threaded software architecture.
• The firmware supports multi-channel operation, with the number of channels limited only by the availability of processor resources.
• Optimised for ARM architectures

 

 

 

 

G.722 Wideband codec

Market Segment(s)

• General Purpose Products/Services

Target Platform(s)

• Android
• Linux

ARM Processor(s)

• ARM1136J-S
• Cortex-A8
• Cortex-A9
• Cortex-M4
• ARMv5
• ARMv6
• ARMv7

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