PCM code and decode system use LSIC called TP3067 as its Codec,DTMF signals receiving uses the chip of MT8870. The clock circuit needed in the design can be supplied by FPGA.

• PCM 编译码系统采用的是大规模专用集成芯片TP3067 编译码器,对DTMF 信号的接收采用的是MT8870 芯片。