Electrical audio signal processing systems and devices – Including frequency control – Having automatic equalizer circuit
Reexamination Certificate
1999-08-24
2008-12-16
Mei, Xu (Department: 2615)
Electrical audio signal processing systems and devices
Including frequency control
Having automatic equalizer circuit
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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Frank Tedeschi,The Active Filter Handbook, Tab Books Inc., Blue Ridge Summit, Pennsylvania, 1979, 141-149.
Logitech Europe S.A.
Mei Xu
Townsend and Townsend / and Crew LLP
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