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The speech signal for telecommunication purposes, can be defined as the time varying electrical waveform, resulting from the output of a transducer. The transducer transforms the acoustic pressure wave resulting from the human speech production mechanism, into a time varying voltage or current representing our speech signal. Speech processing can be defined as the mathematical manipulation of the digitised version of this signal. Speech processing can be
divided into three main areas: speech coding, speech synthesis and speech recognition.
Source coding can be defined as representing analog waveforms by a sequence of binary digits. The simplest of the codec systems consists of a sampler and an instantaneous quantiser, taking each sample of the waveform and representing every a
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