Electrical audio signal processing systems and devices – Binaural and stereophonic
Patent
1995-11-13
1997-10-14
Kuntz, Curtis
Electrical audio signal processing systems and devices
Binaural and stereophonic
381 17, 381 18, 381 21, H04R 500
Patent
active
056779577
ABSTRACT:
A circuit for use in connection with a stereo audio system to increase the ambience includes a differencing circuit for receiving a left stereo input and a right stereo input. The differencing circuit produces an output signal having a difference of the left stereo input and the right stereo input. A shelf filtering circuit is operably coupled to the differencing circuit to receive the output signal. The shelf filtering circuit has a first passband range of frequencies wherein the output signal is attenuated at a first level and a second passband range of frequencies wherein the output signal is attenuated at a second level. The shelf filtering circuit has a crossover frequency between the first passband range of frequencies and the second passband range of frequencies. A summing circuit operably coupled to the left input and the right input and operably coupled to the shelf filtering circuit receives an output signal from the shelf filtering circuit. The summing circuit adds a left minus right attenuated output signal from the shelf filtering circuit to the left input and a right minus left attenuated output signal from the shelf filtering circuit to the right input.
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Kuntz Curtis
Nguyen Duc
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