Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1987-10-16
1990-03-20
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
H04S 100
Patent
active
049107780
ABSTRACT:
The enhancement processor disclosed herein includes left and right channels through which the components of the stereo signal are fed, and a side channel that receives a difference signal derived from the main left and right channel signals. The side channel difference signal is shifted in quadrature, (e.g. + or -90.degree.) relative to the main channels of the processor, adjusted by a variable gain control, low pass filtered and added back into the main left and right channels prior to the stereo outputs. Further enhancement is achieved in the processor by combining with the above effect, a gain adjusted anti-phase cross-feed between the main left and right channels to produce an image-widening characteristic that compensates for some undesired image alteration resulting from the quadrature shifted side channel.
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Isen Forester W.
Jackson Larry A.
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