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G.711 Vocoder by Perry Keller
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G.711 Vocoder |
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Business,Electronics
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Toronto, Canada - GAO Research Inc. (www.GAOResearch.com) is offering its G.711 Vocoder for telephone networks. It provides a compression /decompression (companding) algorithm to deliver precision transmissions of encoded speech signals sampled at the rate of 8 kHz in conformance with the ITU-T G.711 standard. This G.711 vocoder operates at 64 kbps. It includes independent user-callable functions that perform all of the µ-law and A-law encoding and decoding operations. It uses pulse code modulation (PCM) to compress, decompress, encode, and decode analog speech, which can then be transmitted and received as binary data. Two forms of companding standards, the µ-law and the A-law, are specified. G.711 µ-law compresses frames of 14-bit linear PCM samples into frames of 8-bit logarithmic PCM code words and G.711 A-law compresses 13-bit linear PCM samples into 8-bit logarithmic PCM code words. This G.711 vocoder belongs to GAO’s family of Speech Vocoders. This line of products also includes G.729, G.729A and G.729AB Speech Vocoder which is ideal for visual telephony, wireless communications, and digital satellite communication systems, G.726 Vocoder which is used in numerous applications such as speech transmission over digital networks, video conferencing, multimedia, and ISDN communications, G.722 Vocoder and GSM-AMR (AMR-NB) Vocoder which is used mainly in 3rd generation mobile telephony devices to compress toll-quality speech at 8000 samples/second. About GAO Research Inc. GAO Research Inc. (www.GAOResearch.com) 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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