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Principles of Digital Audio, Sixth Edition, 6th Edition by Ken C. Pohlmann

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CHAPTER 12Speech Coding for Transmission

The purpose of speech coding is to represent speech signals in a format that can be used efficiently for communication. Speech codecs must provide good speech intelligibility, while using signal compression to reduce the bit rate. Although speech codecs have goals that are similar to music codecs, their design is fundamentally different. In particular, unlike music codecs, most speech codecs employ source modeling that tailors the codec to the characteristics of the human voice. Speech codecs thus perform well with speech signals, and relatively poorly with nonspeech signals.

Because most transmission channels have a very limited bit-rate capability, speech coding presents many challenges. In addition ...

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