NOISE SUPPRESSION DEVICE, NOISE SUPPRESSION METHOD, NOISE SUPPRESSION PROGRAM AND SOUND COLLECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a noise suppression device by which a delay time difference between a plurality of microphones is accurately calculated and synchronous addition processing can be appropriately operated by utilizing the delay time difference.SOLUTION: A noise suppression device includes: reference signal generation means for generating a predetermined reference signal; delay time calculation means for calculating a sound collection delay time between the plurality of microphones on the basis of a sound collection signal of emission sounds which are collected by the plurality of microphones, based on the reference signal, and the reference signal; self-delay time measurement means for calculating a self-delay time of each microphone on the basis of a maximum delay time among the sound collection delay times of the plurality of microphones and the sound collection delay time of each microphone; and synchronous addition means which performs addition average on the sound collection signal collected by each of the microphones while delaying the sound collection signal just for each of the self-delay times.SELECTED DRAWING: Figure 1