G.726 fell from favor in the 1990s due to its inability to carrymodem and fax signals, but because of its bandwidth/CPU performanceratio it is now making a comeback. This is possible because rather than sending theresult of the quantization measurement, it sends only enough informationto describe the difference between the current sample and the previousone. As of this writing, Asterisk currently supports only theADPCM-32 rate, which is far and away the most popular rate for thiscodec.G.726 offers quality nearly identical to G.711, but it uses onlyhalf the bandwidth. The most common rates are 16 Kbps, 24 Kbps, and32 Kbps. It is alsoknown as Adaptive Differential Pulse-Code Modulation (ADPCM), and it canrun at several bitrates. G.726This codec has been around for some time (it used to be G.721, which is nowobsolete), and it is one of the original compressed codecs. What is true is that G.711 is the base codec from which allof the others are derived.G.711 imposes minimal (almost zero) load on the CPU.
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