verilog写的回波抵消程序，相当于写了个回波抵消的芯片，不是dsp，可编译后下载于FPGA,绝对原创，写了很长时间。-Verilog echo canceller written procedures, wrote the equivalent of echo canceller chip, not dsp, can be downloaded from the compiled FPGA, absolute originality, writing for a long time. -