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High Performance G.728 Vocoder Implements LD-CELP

This software is well-suited for embedded applications in digital circuit multiplication equipment, videoconferencing, digital telephony, and multimedia products. The software encodes 5 sample frames of 16-bit linear PCM data into 10-bit code words and employs backward-adaptive linear predictive coding analysis to achieve a low transcoding delay.

It uses backward adaptation of predictors and gains to achieve an algorithmic delay of only 0.625ms. The ITU-T G.728 standard specifies the encoding of 8kHz sampled speech signals for transmission over a 16kbps channel. The vocoder runs on most commercially available DSPs/microprocessors and under most popular real time operating systems.

About GAO Research Inc. GAO Research Inc. ( is a recognized international leading provider of communications software to telecom and electronics companies and provides the most comprehensive and unique suite of modem, fax, telephony, speech software, VoIP, FoIP, fax relay and fax/modem/voice relay software for embedded applications for DSP and microprocessors.
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