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GSM-AMR (AMR-NB) Vocoder for Speech Compression

GSM-AMR (AMR-NB) Vocoder for Speech Compression

Toronto 5/13/2013 02:06 AM GMT (LinkMyStock)

GAO Research Inc.  is offering its GSM-AMR (AMR-NB) vocoder. It is mainly used for speech compression in the 3rd generation mobile telephony at 8000 samples/second.

This vocoder features optimized C or assembly code, low data and program memory requirements. GSM-AMR is a standard adapted by the 3rd Generation Partnership Project (3GPP). It is an Adaptive Multi Rate-Narrow Band (AMR-NB) speech codec. GAO’s GSM-AMR codec has eight adaptive basic bit rates, 12.2, 10.2, 7.95, 7.40, 6.70, 5.90, 5.15 and 4.75 kbit/s. This codec works on the principle of Algebraic Code Excited Linear Prediction (ACELP) for all bit rates.


To reduce average bit rate, this codec supports the discontinuous transmission (DTX), using Voice Activity Detection (VAD) and Comfort Noise Generation (CNG) algorithms.

This GSM-AMR (AMR-NB) vocoder belongs to GAO’s family of Speech Vocoders. This line includes a wide variety of vocoders such as G.726 Vocoder and G.729, G.729A and G.729AB Speech Vocoder which is ideal for visual telephony, wireless communications, and digital satellite communication systems and other similar products.GAO Research Inc. is a world-renowned provider of high quality, reliable telecommunications software including embedded modem software, fax modem software, speech codes, and telephony software for a wide range of DSPs and microprocessors.


About GAO Research Inc.

GAO Research Inc. is a world-renowned provider of high quality, reliable telecommunications software including embedded modem software, fax modem software, speech codes, and telephony software for a wide range of DSPs and microprocessors.


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