Patent ID: 7169995

Claim:
A full color LED (light-emitting diode) based lighting apparatus operated in synchronism with music comprising an audio frequency band-pass filter, a level comparator, an integration circuit, a microcontroller, and an LED drive circuit wherein: the audio frequency band-pass filter is adapted to filter out signals other than a sound source in sound input for obtaining sound signals and amplify the sound signals prior to inputting to the level comparator; the level comparator is adapted to further amplify the sound signals and convert amplified signals having a voltage higher than a reference voltage into square-wave signals prior to inputting to the integration circuit for frequency calculation; the microcontroller comprises a CPU (central processing unit), a RAM (random access memory), and a ROM (read only memory) having a firmware for controlling the CPU; and the integration circuit is adapted to process the square-wave signals fed from the level comparator for obtaining a corresponding frequency which is stored in a register so that the CPU is adapted to read out the frequency from the register, process input/output (I/O) and scan signals sent from the CPU, and send the processed signals to the LED drive circuit for controlling LED color, whereby the full color LED based lighting apparatus operated in synchronism with music is adapted to be controlled by a single loop frequency.