An auxiliary device connected to the isdn set , such as a speakerphone , headset adapter , or an analog interface 连接isdn装置的辅助设备,如扬声器、耳机适配器或模拟接口。
Modulation technology are well - suited to the implementation of analog interfaces in digital communication and signal processing systems Adc非常适合用来实现数字通信系统和信号处理系统中的模拟接口部件。