superheterodyne receiver

World English Dictionary
superheterodyne receiver (ˌsuːpəˈhɛtərəˌdaɪn)
 
n
Sometimes shortened to: superhet a radio receiver that combines two radio-frequency signals by heterodyne action, to produce a signal above the audible frequency limit. This signal is amplified and demodulated to give the desired audio-frequency signal
 
[C20: from super(sonic) + heterodyne]

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
superheterodyne receiver

noun
a radio receiver that combines a locally generated frequency with the carrier frequency to produce a supersonic signal that is demodulated and amplified [syn: heterodyne receiver
WordNet® 3.0, © 2006 by Princeton University.
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