Audible sound detection control circuits for toys and other amusement devices

A control circuit for an amusement device, wherein the control circuit comprises:

• a sound detector configured to detect audible sound signals;
• 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;
• 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 control a light, a motor and a sound output device in response to receiving the trigger signal.

A toy set comprising:

• a first amusement device that mechanically generates sound in a predetermined audible frequency range when manipulated by a user, the first amusement device being configured to be functionally responsive to manipulation by an infant;
• and
• a second amusement device having a control circuit, a light, a motor and a sound output device, the control circuit including:
• a sound detector configured to detect audible sound signals generated by the first amusement device;
• a band-pass filter electrically coupled to the sound detector, the band-pass filter being configured to extract sound signals in the predetermined audible frequency range and to output a corresponding filtered signal;
• 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 light, the motor and the sound output device, the controller being configured to receive the trigger signal and to provide a first digital control output signal to the light, provide a second digital control output signal to the motor and generate an analog sound output signal to the sound output device in response to the trigger signal, the first and second digital control output signals have a frequency unrelated to the filtered signal.