Patent ID: 7120257

Claim:
An amusement device having a control circuit, the control circuit including a sound detector configured to detect audible sound signals and a band-pass filter electrically coupled to the sound detector, the band-pass filter being configured to extract sound signals in a predetermined audible frequency range and to output a corresponding filtered signal, wherein the improvement to the control circuit comprises: a peak integrator electrically coupled to the band-pass filter, the peak integrator being configured to receive the filtered signal, to average amplitude peaks of the filtered signal and to output a trigger signal based on a predetermined range of the averaged filtered signal; and a controller electrically coupled to the peak integrator, the controller being configured to receive the trigger signal and to provide at least first and second digital control output signals and generate an analog sound output signal in response to the trigger signal, the first and second digital control output signals have a frequency unrelated to the filtered signal.