G.711 Vocoder With Independent User-callable Functions

Toronto, Canada - GAO Research Inc

Toronto, Canada - GAO Research Inc. (www.GAOResearch.com) has announced the release of its G.711 Vocoder for telephone networks. The G.711 codec provides a compression /decompression (companding) algorithm to deliver precision transmission of encoded speech signals sampled at the rate of 8 kHz in conformance with the ITU-T G.711 standard.

ITU-T G.711 is a standard to represent 8 bit compressed pulse code modulation (PCM) samples for signals of voice frequencies sampled at the rate of 8000 samples/second. The G.711 encoder creates a 64 Kbps bitstream. This standard has two forms: A-Law and -Law. The A-Law G.711 PCM encoder converts 13 bit linear PCM samples into 8 bit compressed PCM (logarithmic form) samples, and the decoder reverses the process. The -Law G.711 PCM encoder converts 14 bit linear PCM samples into 8 bit compressed PCM samples.

GAO's G.711 implementation includes independent user-callable functions that perform all of the -law and A-law encoding and decoding operations. The G.711 standard uses pulse code modulation (PCM) to compress, decompress, encode, and decode analog speech, which can then be transmitted and received as binary data.

This G.711 vocoder belongs to GAO's family of Speech Vocoders. This line has provided various speech vocoders that can be used in different occasions. A featured and advanced product is G.722 Vocoder which utilizes a SB-ADPCM decoder and complies with the ITU-T H.320 standard for video conferencing. Another one is G.723.1 Dual Rate Speech Vocoder which specifies a coded representation that can be used for compressing the speech or other audio signal component of multimedia services at a very low bit rate as part of the overall H.324 family of standards. This line of vocoders complies with the ITU-T vocoder standards for speech processing software and audio processing codecs.

Toronto, Canada - GAO Research Inc. (www.GAOResearch.com) has announced the release of its G.711 Vocoder for telephone networks. The G.711 codec provides a compression /decompression (companding) algorithm to deliver precision transmission of encoded speech signals sampled at the rate of 8 kHz in conformance with the ITU-T G.711 standard.

ITU-T G.711 is a standard to represent 8 bit compressed pulse code modulation (PCM) samples for signals of voice frequencies sampled at the rate of 8000 samples/second. The G.711 encoder creates a 64 Kbps bitstream. This standard has two forms: A-Law and -Law. The A-Law G.711 PCM encoder converts 13 bit linear PCM samples into 8 bit compressed PCM (logarithmic form) samples, and the decoder reverses the process. The -Law G.711 PCM encoder converts 14 bit linear PCM samples into 8 bit compressed PCM samples.

by: Perry Keller

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