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Radio receiver design includes the electronic design of different components of a radio receiver which processes the radio frequency signal from an antenna in order to produce usable information such as audio. This article only concentrates on the historical configurations leading up to and including the modern superheterodyne receiver design. The complexity of a modern receiver and the possible range of circuitry and methods employed are more generally covered in electronics and communications engineering. The term ''radio receiver'' is understood in this article to mean any device which is intended to receive a radio signal in order to generate useful information from the signal, most notably a recreation of the so-called baseband signal (such as audio) which modulated the radio signal at the time of transmission in a communications or broadcast system. ==Crystal radio== (詳細はdiode such as the original cat's-whisker diode discovered long before the development of modern semiconductors. * Advantages * * Simple, easy-to-make. Here we see a classic design for a clandestine receiver in a POW camp. * Disadvantages * * Insensitive, it needs a strong RF signal and/or a long-wire antenna to operate. * * Poor selectivity since it only has one tuned circuit. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Radio receiver design」の詳細全文を読む スポンサード リンク
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