Excitation synchronous time encoding vocoder and method

Details Excitation synchronous time encoding vocoder and method Excitation synchronous time encoding vocoder and method

H - Electricity

04

L

H04L 9/00 (2006.01) G10L 19/04 (2006.01) G10L 9/14 (1990.01)

Patent

CA 2123187

EXCITATION SYNCHRONOUS TIME ENCODING VOCODER AND METHOD Abstract of the Disclosure A method for excitation synchronous time encoding of speech signals. The method includes steps of providing an input speech signal, processing the input speech signal to characterize qualities including linear predictive coding (LPC) coefficients, epoch length and voicing and characterizing the input speech signals on a single epoch time domain basis when the input speech signals comprise voiced speech to provide a parameterized voiced excitation function. The method further includes steps of characterizing the input speech signals for at least a portion of a frame when the input speech signals comprise unvoiced speech to provide a parameterized unvoiced excitation function and encoding a composite excitation function including the parameterized unvoiced excitation function and the parameterized voiced excitation function to provide a digital output signal representing the input speech signal.

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