中文说明：对原始的PCM信号进行过采用后，sigma-delta算法采用噪声整形技术将量化噪声推到信号频带之外，并对过采样信号进行1比特量化，从而产生PWM信号。该技术可以用于高效率的数字功率放大器。本仿真程序采用S函数编写关键模块，用matlab的simulink搭建可视化仿真平台。
English Description：
After the original PCM signal is used, Sigma-Delta algorithm using noise shaping quantization noise to the signal outside the band, 1-bit quantization and signal, resulting in a PWM signal. This technology can be used for high efficiency digital power amplifier. This Emulator written by s-function key modules, using MATLAB Simulink builds visual simulation platform.