Patent ID: 8554546
Filing Date: 2013-10-08
Classification: G10L

Abstract:
1. An apparatus for calculating a fundamental frequency change, comprising: a spectrogram calculation unit configured to calculate a logarithmic frequency spectrum by analyzing a frequency of a frame having a predetermined time range divided from a speech signal, the logarithmic frequency spectrum having a frequency element at equal intervals along a logarithmic frequency axis, and to calculate a logarithmic frequency spectrogram by connecting a plurality of logarithmic frequency spectrums of frames adjacent along a time axis; a Hough transform unit configured to vote a value of the frequency element along a straight line on the logarithmic frequency spectrogram onto a Hough plane, the Hough plane having a voted value in correspondence with a gradient of the straight line; an extraction unit configured to extract the voted value larger than a threshold and the gradient corresponding to the voted value from the Hough plane; and a change calculation unit configured to calculate a fundamental frequency change using the voted value and the gradient extracted.