Patent ID: 6947567

Claim:
An audio boost circuit comprising: an input buffer coupled to be responsive to a program input signal having high, low and mid-range frequency signal components, the input buffer having a state-variable filter for processing the program input signal into high, low and mid-range frequency signal components, and a state-variable summing amplifier for balancing and summing the low range, high range and mid-range signal components and for providing a buffered program signal at an output thereof, 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 and an input directly connected to the output of the input buffer to receive the buffered program signal and to provide 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 output signal.