sound-powered telephone

The sound of the telephone intruded into his dreams.

电话铃声把他从梦中扰醒了。

《牛津高阶英汉双解词典》

In data communications, a type of telecommunication device that permits use of a telephone network for data transmission by means of sound transducers.

数据通信里的一种远程通信装置，通过声音传感器，可将电话网用于数据传输。

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Edison had his first Menlo Park success in November of 1877. He had been attempting to record human sound since his breakthrough improvement on Alexander Graham Bell's telephone.

1877年11月爱迪生取得了在门洛园的第一次成功，自从他在亚历山大·格雷厄姆·贝尔的电话上取得突破性进展就一直在尝试记录人声。

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Any Bell Labs engineer would be familiar with the idea of reducing the frequency range of speech, since the telephone cut off sound above 4000 Hz.

贝尔实验室的任何一个工程师，对降低声音的频率范围都很熟悉，因为电话会削去4000Hz以上的声音。

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