DEVICE FOR DETERMINATION OF PITCH SEARCH RANGE, PITCH SEARCH DEVICE, PACKET LOSS COMPENSATION DEVICE, THEIR METHODS, PROGRAM AND ITS RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To provide technology for determining a search range used in a pitch estimation method, which is used for packet loss concealment (packet loss compensation) etc. PSOLUTION: An adoption index calculation part 11 calculates an adoption index which is the index for expressing a vocality of an audio signal of a part in which the pitch is to be obtained. A judgment section 2 judges whether or not, the vocality of the audio signal in which the pitch is to be obtained is stronger than prescribed strength, by comparing the adoption index with a predetermined adoption reference value. When it is judged that the vocality of the audio signal of the part in which the pitch is to be obtained is stronger than the prescribed strength, a search range determination section 13 determines that a search range A is the search range, and otherwise, a search range B which is narrower than the search range A is the search range. PCOPYRIGHT: (C)2009,JPO&INPIT