NOISE SUPPRESSION DEVICE

摘要

A probability density function controller determines a probability density function dependent upon whether an input signal appears to be a sound or noise, i.e., a probability density function that is suited to a distribution state of a sound signal in a sound section and that in a noise section, and a suppression amount calculator 8 calculates a spectrum suppression amount by using the probability density function.

主权项

1. A noise suppression device that converts an input signal in time domain into a power spectrum which is a signal in frequency domain, calculates a suppression amount for noise suppression by using said power spectrum and an estimated noise spectrum estimated separately from said input signal, performs amplitude suppression on said power spectrum according to said suppression amount, and converts said power spectrum on which the amplitude suppression is performed into a signal in time domain to acquire a noise-suppressed signal, wherein said noise suppression device comprises a probability density function controller that analyzes said input signal to calculate a first index showing whether said input signal appears to be a voice or noise, and that controls a probability density function that defines a distribution state of a sound on a basis of said first index, and calculates said suppression amount by using said probability density function in addition to said power spectrum and said noise estimated spectrum.