电话机双音频拨号集成电路原理及故障判断方法

Principle Analysis and Fault Estimation of Double Audio Frequency Telephone set's Dialing Integrate Circuit

文章介绍了双音频电话机的基本概念和拨号原理 ,并对常见故障进行了分析与探讨。

The paper introduces the basic conception and dialing principle of double audio frequency telephone set, also makes analysis and probe of the regular fault.