FUNCTIONS OF THE VOICE CODER
The principal function of a voice coder is to encode pulse code modulation (PCM) user speech samples into a small number of bits (a frame) in such a manner that the speech is robust in the presence of link errors, jittery networks, and bursty transmissions. At the receiver, the frames are decoded back to the PCM speech samples, and then converted to the waveform.
Figure 4-1. Analysis-by-synthesis operations [WEST96]
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