| 摘要 |
PROBLEM TO BE SOLVED: To improve the quality of sound in estimating a noise signal from an input signal and selectively reducing the noise signal.SOLUTION: A noise band power estimation unit estimates a band power of noise of each band from a band power of each band division signal obtained in a band power computation unit and a determination result of a noise determination unit. A noise suppression gain decision unit decides a noise suppression gain of each band based on the band power of each band division signal and the band power of noise of each band estimated. The noise band power estimation unit increases speed of following a noise change in the non-stationary noise to be higher than speed of following a noise change in the stationary noise. The performance of following the non-stationary noise improves, and therefore, effective noise suppression can be realized not only for stationary noise but also for non-stationary noise. |
