Stereo image recovery

Details Stereo image recovery Stereo image recovery

1983-11-22

1986-01-28

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

381 97, 381 99, 381100, H04R 500

Patent

active

045676070

ABSTRACT:
A method and apparatus for improving the accuracy in locating psychoacoustic images in plural channels of related audio signals. Signals are cross-fed from one channel to another in an out-of-phase relationship with respect to the signals in the other channel. The phase relationship is such that it has not more than a single maximum with respect to frequency. Cross-feeding is limited to frequency components less than a predetermined value in the range of 1,000 to 5,000 Hertz. The overall gain of each of the audio channels in the frequency range of approximately 100 to 1,000 Hertz is greater when a signal is applied to that channel only, than when the signal is applied to both channels. When the same signal is applied to both channels, a dip in gain occurs for frequencies in the range of approximately 200 to 900 Hertz. Above the dip, the gain is relatively flat and below the dip, the gain increases gradually.

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