| 摘要 |
PROBLEM TO BE SOLVED: To improve the articulation of a speech radiated from a speaker by processing a speech signal picked up by a microphone before it is outputted to the speaker. SOLUTION: The speech signal which is digitized by an A/D converter 11 is inputted to a windowing processing part 12 for frame division and then passed through an FFT 13, and a logarithmic spectrum calculation part 14 calculates a logarithmic spectrum, which is subjected to IFFT 15 to generate a cepstrum coefficient. Then regression coefficient calculation parts 16-1 to 16-n calculates regression coefficients when the cepstrum coefficient is viewed in the time direction and a square averaging part 17 calculates the average (D value) of squares of the regression coefficient; and the D value is passed through a threshold processing part 18 to find a stationary part of the speech signal, and a multiplier 19 suppresses the amplitude of the speech signal for the found stationary part, so that the result is outputted through a D/A converter 20. COPYRIGHT: (C)2005,JPO&NCIPI |
