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

摘要

A time difference DELTA tau between the arrival of acoustic signals from sound sources to microphones 1, 2 is detected from output channel signals L, R from 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 tau i ( i = 1, 2, ... n ) in the time-of-arrival of L(f1) - L(fn) and R(f1) - R(fn) to the microphones 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 tau ), a middle range of 1/(2 DELTA tau ) < fi < 1/ DELTA tau , and a high range of fi > 1/ DELTA tau . Utilizing DELTA tau i for the low range, DELTA Li and DELTA tau i for the middle range and DELTA Li for the high range, a determination is made from which sound source L(fi), R(fi) are oncoming to deliver outputs separately for each sound source. The outputs are subject to an inverse Fourier transform for synthesis separately for each sound source.