MQAM在DSP中进行信号处理需要的载波相位恢复程序，适用于16QAM信号的载波相位恢复，利用Python语言编写 -MQAM signal processing in the DSP requires the carrier phase recovery process, the 16QAM signal applied to the carrier phase recovery, using the Python language

python编程，实现了对语音信号的两种处理操作，如放回音，音高变化。-python programming, the two speech signal processing operations, such as back tone, pitch change.