编码器生成M序列进行通信，接收后再进行解码。用于扩频率通信中。通过状态机实现。-The encoder generates the M sequence for communication, the receiver and then decoded. For the expansion of the frequency communications. Through the state machine implementation.

基于单片机的2ASK调制与解调，输入信号为伪随机M序列(2ASK modulation and demodulation based on single chip microcomputer, the input signal is pseudo-random sequence)