A stereophonic image may be enhanced by splitting the left and right input audio signals into a plurality of left and right output signals in a plurality of audio frequency bands and then generating left and right output audio signals from the left and right output signals based on the magnitude of the...http://www.google.de/patents/US5930733?utm_source=gb-gplus-sharePatent US5930733 - Stereophonic image enhancement devices and methods using lookup tables
