Electrical audio signal processing systems and devices – Including frequency control
Reexamination Certificate
2005-09-20
2005-09-20
Lee, Ping (Department: 2644)
Electrical audio signal processing systems and devices
Including frequency control
C330S128000
Reexamination Certificate
active
06947567
ABSTRACT:
An audio boost circuit having an input buffer responsive to a program input signal for providing a buffered program signal, An all pass phase inverter having an input coupled to receive the buffered program signal and an output providing an inverted buffered program signal. A band pass filter having a predetermined Q, responsive to the buffered program signal for providing an inverted band pass boosted program signal. A summing amplifier for adding the inverted buffered program signal to the inverted band pass boosted program signal and for providing a composite program signal signal. A frequency adjustment means for adjusting the frequency at which the peak gain occurs. The input buffer is a state-variable input filter that processes the program input signal into high, low and mid-range frequency signal components. The input buffer has gain control circuitry for balancing and summing the high and mid-range signal components. A state-variable band-pass active filter processes the program input signal to produce the high, low and mid-range frequency signal components. A summing circuit adds the high, low and mid-range frequency signal components to provide the buffered program signal.
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“The Active Filter Handbook” by Frank Tedeschi, pp. 160-168, Tab Books Inc. of Blue Ridge Summit, PA, 17214.
BBE Sound Inc.
Kirk James F.
Lee Ping
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