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Vocoder

G.722.2 (AMR-WB) Vocoder Supports Half and Full Duplex Modes

Toronto, Canada -GAO Research Inc. (www.GAOResearch.com) recommends this G.722.2 (AMR-WB) vocoder, which is ITU-T G.722.2 compliant and has passed all ITU-T test vectors. The G.722.2 standard uses a wideband, adaptive multi-rate algorithm. It is available for applications including video phones,audio/video conferencing and media gateways.
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ITU-T G.723.1 Compliant Vocoder Now Available

Toronto, Canada - GAO Research Inc. (www.GAOResearch.com) recommends its latest enhanced ITU-T G.723.1 compliant vocoder which performs compression and decompression of 8kHz speech signals. It encodes 16-bit PCM samples into 16-bit code-words yielding 10 or 12 code-words per 240 sample frames for the 5.3Kbps and 6.3Kbps channels respectively.
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G.726 Vocoder Suited for Numerous Applications

Toronto, Canada-GAO Research Inc. (www.GAOResearch.com) recommends this high performance G.726 vocoder which has been widely used in applications such as speech transmission over digital networks, video conferencing, multimedia and ISDN communications. This G.726 vocoder complies with the ITU-T standard and operates at 40, 32, 24, and 16kbps.  It was introduced to supersede both G.721, which covered ADPCM at 32 kbit/s, and G.723, which described ADPCM for 24 and 40 kbit/s. G.726 also introduced a new 16 kbit/s rate. The four bit rates associated with G.726 are often referred to by the bit size of a sample, which are 2-bits, 3-bits, 4-bits, and 5-bits respectively.
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