音乐（语音）通过语音芯片转化为差分输出的模拟量电压信号，经过差分减法电路转化为单端信号，AD转换芯片将模拟信号转化为数字信号。利用单片机设计数字滤波器对语音信号进行处理，根据低通、带通和高通三个滤波器的计算结果输出三路PWM信号。三路PWM信号经驱动电路分别控制LED光带红、绿和蓝三种颜色的亮度，灯光颜色明暗随音乐变化。-Music (Voice) by voice chip into a differential output analog voltage signal, through a differential subtraction circuit into a single-ended signal, AD converter chip analog signal into a digital signal. Single-chip digital filter design using speech signal processing, three-way PWM output signal based on the results of low-pass, band-pass and high-pass filters of the three. Three PWM signals are controlled by the driver circuit LED light with red, green and blue color brightness and light color shade with the music changes.