Patent ID: 9661436
Date: 2017-05-23
CPC Classifications: H04R,H04S

Claim:
1. An audio signal playback device that plays back a multi-channel input audio signal with a speaker group of a speaker array including at least two speakers, using a wavefront synthesis playback, the device comprising: signal processing circuitry that performs signal processing on each of 2 or more channel audio signals obtained from the multi-channel input audio signal; and low frequency signal extraction circuitry that extracts a low frequency signal of a correlation signal with a lower frequency than a predetermined frequency from the 2 or more channel audio signals, wherein the signal processing circuitry outputs the low frequency signal of the correlation signal from the at least two speakers of the speaker array, and outputs the low frequency signal of the correlation signal such that a time difference in sound output between adjacent speakers of the at least two speakers is equal to or less than 2Δx/c, where Δx is a distance between the adjacent speakers, and c is the speed of sound.