Patent ID: 6611797
Filing Date: 2003-08-26
Classification: G10L

Abstract:
A speech coding method, comprising:analyzing an input speech signal (1) to divide the input speech signal into a parameter representing a frequency characteristic of speech and an excitation signal, the excitation signal being an input signal to a synthesis filter, the synthesis filter generated based on the parameter, and (2) to output a first index specifying the parameter as a coded result, the excitation signal being formed of a pulse train including pulses selected from first pulses and second pulses, the first pulses being set at first positions located on sampling points of the excitation signal, and the second pulses being set at second positions located between the sampling points of the excitation signal; generating a synthesized speech signal based on the coded result and the excitation signal; generating a second index indicating a parameter with which an error between the input speech signal and the synthesized speech signal is minimized; selecting a pulse position candidate from a pulse position codebook in accordance with the second index; and outputting the first and second indexes.