Patent ID: 7542898
Filing Date: 2009-06-02
Classification: G10L

Abstract:
1. A pitch cycle search range setting apparatus that sets a pitch cycle search object in pitch cycle search processing for searching for a pitch cycle included in a linear predictive residual on a per subframe basis, the pitch cycle search range setting apparatus comprising: a pitch cycle indicator that sequentially outputs pitch cycle candidates within a predetermined pitch cycle search range at integral accuracy; a previous subframe integral pitch cycle memory that stores an integral component of a pitch cycle selected in pitch cycle search processing of a previous subframe; and an adaptive sound source vector generator that sets, as the pitch cycle search object in pitch cycle search processing in a processing subframe section, a group of candidates comprising a group of integral-accuracy pitch cycle candidates output from the pitch cycle indicator and a group of fractional-accuracy pitch cycle search candidates that cover a pitch cycle near an integral component of the pitch cycle read from the previous subframe integral pitch cycle memory using fractional accuracy.