The authors provide an accurate scheme for generating the excitation sequence in multipulse speech coding. The method is based on spiky deconvolution techniques, which take advantage of the sparse character of the multipulse sequence. It is shown how a threshold deconvolution procedure, formerly developed by some of the authors, can be extended to deal with all-pole filters, and, consequently, how the multipulse sequence can be estimated on every frame of speech data. Quantization procedures for coding the multipulse sequence are also discussed in order to achieve a bit rate transmission lower than 6.5 kb/s.
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