pulse phase modulation-amplitude modulation system

例句：

1. 1.The pulse-code modulation system is widely used in wireless communication systems.
   脉冲编码调制系统在无线通信系统中被广泛应用。
2. 2.The pulse-code modulation system provides high-speed data transmission with low power consumption.
   脉冲编码调制系统以低功耗实现了高速数据传输。
3. 3. In the pulse-code modulation system, the signal is modulated by a carrier wave to transmit information.
   在脉冲编码调制系统中，信号通过载波波来传输信息。