无线电接收机
无线电术语中，接收机是一种从天线接收并解调无线电信号的电子设备，主要用于声音，图像定位信息等。 人们日常生活中用到的收音机，电视机，卫星电视接收机，寻呼机，GPS等都是无线电接收机。
一般来说, 接收机指的由调台装置，前置放大器和功率放大器组成的电子电路放在一个盒子里构成的。一些老的接收机还有扬声器。 It is a common component in a 高保真或者家庭影院 system although some audiophiles believe that a separate tuner may provide superior reception and 声音. The receiver is generally the nerve centre of a sophisticated home-theatre system providing selectable inputs for a number of different audio components like 电唱机, 激光唱机, and tape decks and 视频 components like 盒式磁带录像机, DVD播放机, 电视游戏机, 和电视机. Modern receivers tend to omit inputs for turntables and cassette decks and, instead, provide 数字信号处理器 to give 更真实的illusion of listening in a 音乐厅. 数字音频 S/PDIF connections are also common today.
Some modern receivers can send audio out to seven loudspeakers and an additional channel for a subwoofer and often include connections for 耳机. Receivers vary greatly in price, support 立体声 or 环绕声, and a high-quality unit can be relatively inexpensive--$200 美国 or less. Because modern receivers are purely electronic devices with no moving parts unlike electromechanical devices like turntables and cassette decks, they tend to 提供多年的trouble-free服务。近年来，the home theater in a box has become common, which often integrates a surround-capable receiver with a DVD player. The user simply connects it to a television, perhaps other components, and a set of loudspeakers.
自供电收音机有一个自带手摇发电机可用于发展中国家或者as part of an emergency/disaster preparedness kit.
[编辑] 其它类型的无线电接收机
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