NOISE SUPPRESSION DEVICE AND AUDIO DECODING DEVICE

摘要

A processed component calculation unit (14) acquires a deformed noise suppression spectrum (18a) according to a ratio of a noise-suppressed spectrum (18) against an estimated noise spectrum (17). Furthermore, a phase disturbing unit (15) disturbs a phase so as to obtain a processed spectrum (19) as a smoothing component which makes a degrading component contained in the noise-suppressed spectrum (18) to be subjectively nothing. A signal addition unit (11) adds a processed spectrum (19) to a frequency component of the noise suppressed spectrum (18) which has been degraded by the noise suppression process by a noise suppression unit (3), thereby suppressing the degraded component.