Patent ID: 6470310
Filing Date: 2002-10-22
Classification: G10L

Abstract:
A speech encoding method for encoding an input speech signal with the pitch period of the input speech signal, said method comprising:dividing the input speech signal into a plurality of frames of a predetermined length and dividing each frame of the input speech signal into a plurality of subframes; determining a search range searched to find the pitch period of a present subframe to be encoded, according to the length of the pitch period found in a previous subframe prior to the present subframe; finding the pitch period of the present subframe from the search range; and encoding the pitch period of the present subframe; wherein: when the pitch period of the present subframe is found, the search range is searched to find a plurality of candidates for the pitch period of the present subframe; the candidates that are closer to the pitch period found in the previous subframe are spaced closely to each other; and the candidates that are widely different from the pitch period found in the previous subframe are spaced widely from each other.