Method and apparatus for separation of sound source, program recorded medium therefor, method and apparatus for detection of sound source zone, and program recorded medium therefor

Abstract From the Canadian patent

A time difference .DELTA. ~ between the arrival of acoustic signals from sound sources to microphones 1 2 is detected from, output channel signals L R form microphones 1, 2. By Fourier, transform the signals L, R are divided into respective frequency bands L(f1) - L(fn), R(f1) - R(fn). Differences .DELTA. ~ i (i = 1 2,...n) in the time-of-arrival of L(F1) - L(fn) and R(f1) - R(fn) to the mocrophones 1, 2 as well as a signal level difference .DELTA. Li are detected. L(f1) - L(fn) R(f1) - R(fn) are divided into, a low range of fi < 1 / (2 .DELTA. ~) a middle range of 1 / (2 .DELTA. ~), < fi < 1 / .DELTA. ~ and a high range of fi> 1 / .DELTA. ~. Utilizing .DELTA. ~ i for the low range, .DELTA. …