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问:上三节讲了脉冲拨号电路和双音频拨号电路,那么请问什么是通话电路,它是如何组成的? 答:通话电路又称为送、受话电路,它是自动电话机的主要组成部分。通话电路主要由三个部分组成:①送话放大器;②受话放大器;③消侧音电路。 送话放大器是将发话人的语音信号转换为电信号并进行功率放大,然后输送至外线;受话放大器则是将由外线输入的电信号进行放大处理,然后再将其还原成语音信号。送、受话放大器通过消侧音电路进行连接。 问:送话放大器是如何工作的?
Q: The last three sections talked about the pulse dialing circuit and dual tone dialing circuit, so what is the call circuit, how is it composed? Answer: call circuit, also known as send and receive circuit, which is the main part of the automatic telephone . The call circuit is mainly composed of three parts: ① sending speaker amplifier; ② receiver amplifier; ③ cancellation side tone circuit. Transponder amplifier is the speaker’s voice signal is converted to electrical signals and power amplification, and then delivered to the outside; receiver amplifier is the external signal input by the amplification, and then restore it to voice signals. Send, receiver amplifier connected through the anti-side sound circuit. Q: How does the sending amplifier work?