Noise reduction apparatus and noise reducing method

摘要

A noise reduction apparatus (1) includes an analysis unit (2) for converting input into a signal of a frequency area, a suppression unit (3) for suppressing the signal, and a synthesis unit (4) for synthesizing a signal of a time area. The apparatus (1) further includes an estimation unit (5) for estimating, using the output of the analysis unit (2), information corresponding to at least pure voice element excluding noise element in an input voice signal as voice information which is the basic voice information for calculation of a suppression gain of a signal, and a unit (6) for calculating a suppression gain corresponding to the output of the estimation unit (5) and the analysis unit (2) and providing it for the suppression unit (3).