A visual or audible signaling device, operated by relays, which indicates conditions of associated circuits.
用继电器操作的一种可视信号或音响信号装置,用以指示有关电路的情况。
fire-alarm, electric, incorporating sound or visual signaling devices
电动火警报警器,装有音响或视觉信号装置
a device for converting electric signals into sounds; it is held over or inserted into the ear.
转换电力信号到声音信号的装置；插到耳朵上。
equipment used to broadcast radio or tv signals.
播送收音机或电视机信号的装置。
electro sound or visual signaling apparatus (e.g., bells, sirens, indicator panels, burglar and firealarms), other than those
电动音响或视觉信号装置（例如,铃、汽笛、指示器配电盘、防盗警报器和防火警报器）
A sound or a signal, as from a horn or an electronic device.
嘟嘟声一种象从号角或电子装置发出的声音或信号
Tone or Pulse Dialing
设置音频或脉冲信号
high-frequency remote signalling apparatus
高频远距离信号装置
Indicating and recording instruments and annunciating devices.
指示记录仪和信号装置。
automatic-alarm-signal keying device
自动告警信号键控装置
protective pressure signaling unit
保护性压力信号装置
A device that can generate and propagate signals representing data or speech.
一种能生成和传送代表数据或话音的信号的装置。
distress signal warning device
求援信号装置者携带的一种手动装置
device for converting digital signals into analogue signals.
把数字信号转换成对等信号的装置。
device for converting analogue signals into digital signals.
把对等信号转换成数字信号的装置。
A trademark used for an electronic device that eliminates noise from recorded sound and audio signals.
道尔贝降噪系统一种能从录音或声音信号中消除噪音的电子装置的商标名
electronic aural responder
电子音响信号应答器
tape recorder as one component in a hi-fi system
（高保真度的音响装置中的）录音座.