Method and apparatus for separation of source, program recorded

Details Method and apparatus for separation of source, program recorded Method and apparatus for separation of source, program recorded

1997-09-16

2000-10-10

Lee, Ping

Electrical audio signal processing systems and devices

Noise or distortion suppression

Spectral adjustment

381 947, H04B 1500

Patent

active

061309494

ABSTRACT:
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.

REFERENCES:
patent: 3989897 (1976-11-01), Carver
patent: 4008439 (1977-02-01), Schroeder
patent: 4358738 (1982-11-01), Kahn
patent: 4932063 (1990-06-01), Nakamura

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