Accurate, critically sampled characteristic waveform surface construction for waveform interpolation decomposition

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Electronics Letters, ISSN: 0013-5194, Vol: 36, Issue: 14, Page: 1245-1247

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N. R. Chong-White; I. S. Burnett
Institution of Engineering and Technology (IET); IET Digital Library
Engineering; Physical Sciences and Mathematics
article description
A waveform-matched waveform interpolation (WMWI) technique is presented which offers improved signal analysis over standard WI coders and, in the unquantized case, perfect reconstruction. In WMWI, an accurate representation of speech evolution is formed by extracting consecutive pitch periods of a time-warped, constant pitch residual. A pitch track optimization technique is described which ensures that the critically sampled pitch periods can be effectively decomposed into a slowly evolving and rapidly evolving waveform, allowing efficient quantization.