APPARATUS, METHOD AND PROGRAM FOR EXTRACTING FUNDAMENTAL FREQUENCY VARIATION AMOUNT

摘要

PPROBLEM TO BE SOLVED: To provide a technique for obtaining a fundamental frequency variation amount in which influence of background noise is reduced without limiting a range of fundamental period in advance. PSOLUTION: A logarithmic frequency spectrogram calculation section 101 calculates a logarithmic frequency spectrogram with respect to an audio signal input, frame by frame. A Haugh transform section 102 performs Haugh transform for detecting a straight line by polling using the intensity of a frequency component with respect to the logarithmic frequency spectrogram calculated by the logarithm frequency spectrogram calculation section 101. A straight line group extraction section 103 uses a polling value outputted by the Haugh transform section 102 to extract a straight line group being an object to be used to calculate the fundamental frequency variation amount and an object polling value. A fundamental frequency variation amount calculation section 104 calculates a fundamental frequency variation amount using: gradients of individual straight lines included in the straight line group extracted by the straight line extraction section 103; and the object polling value. PCOPYRIGHT: (C)2010,JPO&INPIT