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Reference.org
Superheterodyne receiver
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<p>A superheterodyne receiver, often shortened to superhet, is a type of <a href="/facts/Radio_receiver/5olDTxkg">radio receiver</a> that uses <a href="/facts/Frequency_mixer/RopD2DxD">frequency mixing</a> to convert a received signal to a fixed <a href="/facts/Intermediate_frequency/9mPpJtSA">intermediate frequency</a> (IF) which can be more conveniently processed than the original <a href="/facts/Carrier_frequency/ae98pBlY">carrier frequency</a>. It was invented by French radio engineer and radio manufacturer <a href="/facts/Lucien_L%C3%A9vy/RGoyWVFo">Lucien Lévy</a>.[<i>unreliable source?</i>] Virtually all modern radio receivers use the superheterodyne principle. </p>