Patent ID: 6741960
Filing Date: 2004-05-25
Classification: G10L

Abstract:
A harmonic-noise speech coder of the mixed signal of voiced/unvoiced sound using harmonic model, which comprises a noise spectral estimating means for coding the noise component by predicting the spectral by LPC analysis method after separating the noise component that is unvoiced sound component from the inputted LPC residual signal using cepstrum said noise spectral estimating means comprising a logarithmic value extracting means for extracting the negative logarithmic value of the extracted cepstrum in said cepstrum analysis; an amplitude extracting means for extracting the spectral valley portion of the mixed signal corresponding to said extracted negative logarithmic value of the spectrum region; an LPC analyzing means for extracting the spectral information by applying IDFT to said extracted noise spectral; an LSP transforming means for transforming said extracted LPC parameter to LSP parameter; and a gain computing means for computing the gain value of the noise component.