Dynamic bass equalization with modified sallen-key high pass...

Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit

Reexamination Certificate

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C381S098000

Reexamination Certificate

active

07466829

ABSTRACT:
A dynamic bass equalization circuit has an amplitude dependent gain that is dependent upon the audio electrical signal amplitude and a dynamically adjusted frequency response that varies with the amplitude dependent gain. In one implementation, the dynamic bass equalization circuit includes a Sallen-Key high pass filter that includes an amplifier with a negative feedback path. The dynamically adjusted frequency response is provided by a parallel pair of reversed diodes connected in the negative feedback path.

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patent: 5359665 (1994-10-01), Werrbach
patent: 5361381 (1994-11-01), Short
patent: 6665408 (2003-12-01), Schott
Frank Tedeschi,The Active Filter Handbook, Tab Books Inc., Blue Ridge Summit, Pennsylvania, 1979, 141-149.

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