DECOMPOSITION IN NOISE AND PERIODIC SIGNAL WAVEFORMS IN WAVEFORM INTERPOLATION

摘要

A method of coding a speech signal is described. In accordance with themethod, a plurality of sets of indexed parameters are generated based onsamples ofthe speech signal. Each set of indexed parameters corresponds to a waveformcharacterizing the speech signal at a discrete point in time. Parameters oftheplurality of sets are grouped based on index value to form a first set ofsignals whichrepresents the evolution of characterizing waveform shape; the signals of thefirst setare filtered to remove low frequency components and thereby produce a secondsetof signals which represents relatively high rates of evolution ofcharacterizingwaveform shape. The speech signal is then coded based on the second set ofsignalsrepresenting high rates of characterizing waveform shape evolution. Coding ofthespeech signal may further be based on a set of smoothed first signals.