G.726 Speech Vocoder Complies with ITU-T G.721 and G.723 Standards
GAO Research Inc. is offering its G.726 vocoder which converts a 64 kbps A - law or μ-law PCM channel to or from a 40, 32, 24 or 16 kbps channel. This speech vocoder can be used in numerous applications such as speech transmission over digital networks, video conferencing, multimedia, and ISDN communications.
GAO Research’s G.726 vocoder complies with the ITU-T standard and operates at 40, 32, 24, and 16 kbps. ITU-T G.726 is a superset of the ITU-T G.721 and G.723 standards and was originally designed as a half-rate alternative to G.711 audio companding. The conversion is applied to the PCM bit stream using an ADPCM transcoding technique thus the scheme has switchable transmission rates providing 4 kHz of audio bandwidth in conformance with the ITU-T standard.
This G.726 vocoder can encode 13 or 14-bit PCM samples or 8-bit, A-law or μlaw encoded data into 2, 3, 4, or 5-bit code words. Since the algorithm encodes one sample at a time, the coding or decoding delay is effectively zero providing for robust, quality audio. In addition, processing frame size and input/output formats are user selectable.
This high performance G.726 Vocoder belongs to GAO's family of Speech Vocoders. Other featured products in this line are GSM-AMR Vocoder which is used mainly in 3rd generation mobile telephony devices to compress toll-quality speech at 8000 samples/second, G.711 Vocoder which 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 and G.729, G.729A and G.729AB Speech Vocoders which provide toll-quality speech with only moderate processing requirements and delay times and also perform well in the presence of random bit errors.
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.
