Digital signal
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A digital signal is a signal that represents data as a sequence of discrete values; at any given time it can only take on, at most, one of a finite number of values. This contrasts with an analog sign
A frequency-shift keying (FSK) signal is alternating between two waveforms and allows passband transmission. It is considered a means of digital data transmission.
Broadcast radio receiver
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The most familiar form of radio receiver is a broadcast radio receiver, often just called a broadcast receiver or simply a radio, as used for radio broadcasting. It receives audio programs intended fo
A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations.
A bedside clock radio that combines a radio receiver with an alarm clock