| 主权项 |
1. A noise suppression device, comprising:
a phase difference utilization range computation section that, based on an inter-microphone distance between a plurality of microphones contained in a microphone array and on a sampling frequency, computes as a phase difference utilization range a frequency band in which phase rotation of phase difference does not occur for each frequency between input sound signals containing a target voice and noise that are input from each of the plurality of microphones; an amplitude condition computation section that, based on an amplitude ratio or an amplitude difference for each frequency between the input sound signals, computes amplitude conditions to determine whether or not the input sound signals are the target voice or the noise based on the inter-microphone distance and a position of a sound source of the target voice; a phase difference derived suppression coefficient computation section that, over the phase difference utilization range computed by the phase difference utilization range computation section, computes, for each frequency, a phase difference derived suppression coefficient based on a phase difference; an amplitude ratio derived suppression coefficient computation section that computes, for each frequency, an amplitude ratio derived suppression coefficient based on the amplitude ratio or the amplitude difference, and based on the amplitude conditions computed by the amplitude condition computation section; and a suppression section that suppresses noise contained in the input sound signals based on a suppression coefficient determined using the phase difference derived suppression coefficient and the amplitude ratio derived suppression coefficient. |
