Communication apparatus for speech signal

Details Communication apparatus for speech signal Communication apparatus for speech signal

H - Electricity

04

K

379/1

H04K 1/00 (2006.01) G10L 19/08 (2006.01)

Patent

CA 2037326

Disclosed is a communication apparatus for an input speech signal which calculates linear predictive coefficients of the input speech signal and inversely filters the speech signal by using the linear predictive coefficients in order to flatten the spectral envelope of the input speech signal and produce a predictive residual signal. A low power frequency component is adaptively removed out of frequency components of the predictive residual signal by using the calculated linear predictive coefficients. The linear predictive coefficients are converted into a signal having the removed frequency components. The converted signal and the removed predictive residual signal are combined. This configuration of the present invention make it possible to faithfully transmit an important speech component including the Formant component without having to increase a data amount of transmitted information, and thereby to provide a communication apparatus for a speech signal which ensures high sound quality.

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