Patent ID: 8351621

Claim:
A system for limiting excursion of an audio speaker comprising: a first lowpass filter circuitry configured to receive a system input signal, the first lowpass filter circuitry configured to generate a first filtered output signal and to provide the first filtered output signal to a clipping circuitry; a first combiner circuitry configured to receive a signal from the clipping circuitry; a first highpass filter circuitry configured to receive the system input signal and to generate a second filtered output signal, the first highpass filter circuitry configured to provide the second filtered output signal to the first combiner circuitry; a second lowpass filter circuitry configured to receive a combined output signal from the first combiner circuitry and to provide a third filtered output signal to a second combiner circuitry; an allpass filter circuitry configured to receive the system input signal and to generate a fourth filtered output signal; and a second highpass filter circuitry configured to receive the fourth filtered output signal from the allpass filter circuitry and to provide a fifth filtered output signal to the second combiner circuitry, the second combiner circuitry configured to generate an excursion limiting output signal.