脉冲编码调制

例句：

1. 1. The digital signal is transmitted using pulse code modulation.
   数字信号通过脉冲编码调制进行传输。
2. 2. This method of data transmission is known as pulse code modulation.
   这种数据传输方法被称为脉冲编码调制。
3. 3. In radio communication, pulse code modulation is used to transmit signals over long distances.
   在无线电通信中，脉冲编码调制被用来在长距离上传输信号。