| 摘要 |
PURPOSE:To improve synthetic sound quantity of high pitch frequency by comparing the largest value among absolute values of an cross correlation function which is updated in order while a driving sound source pulse is searched for with a predetermined threshold value and searching for the driving sound source pulse until the largest value becomes smaller than the threshold value. CONSTITUTION:A voice signal which is inputted from an input terminal 1 is inputted to a short-time spectrum information extraction part 2 and a cross correlation function part 3, the output result of the short-time spectrum information extraction part 2 is inputted to an autocorrelation function part 4 and the cross correlation function extraction part 3, and the output of the cross correlation function extraction part 3 and the output of the autocorrelation function extraction part 4 are inputted to a driving sound source pulse search part 5. Then a cross correlation function maximum absolute value calculation part 6 finds the maximum value among absolute values of the cross correlation which is updated successively while the driving sound source pulse is searched for and compares it with the predetermined threshold value, and a driving sound source pulse search part 5 searches for the driving sound source pulse until the maximum value becomes smaller than the threshold value. Consequently, the synthetic sound quality of high pitch frequency is improved. |
