摘要
介绍1种由AT89C51、DTMF收发器MT8880、语音电路ISD4004及开关矩阵MT8816等构成的小型程控交换机的硬件设计和工作原理。
This paper discusses the hardware design and operating principle of a private automatic branch exchanger (PABX), which is composed of AT89C51, integrated DTMF transceiver MT8880, single-chip voice record/playback device ISD4004 and 8×16 analog switch array MT8816, etc.
出处
《电子元器件应用》
2003年第8期30-32,共3页
Electronic Component & Device Applications
