完成半带滤波器的信号产生，和滤波器系数输出。输出信号时域谱和频谱。-The completion of half-band filter the signal generator, and filter coefficient of the output. Time-domain output signal spectrum and spectrum.

D类音频放大器设计：音频放大器的目的是以要求的音量和功率水平在发声输出元件上重新产生真实、高效和低失真的输入音频信号-Class D audio amplifier design: the audio amplifier is the purpose of the volume and power requirements of the level of sound output device in the re-created real, efficient, and low distorti