= Radio receiver
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= Receiver
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As well put by Wikipedia, a radio raceiver has to perform three functions on the signal from the antenna:
* filtering, so you can tune the the station you care about. This filters based on the frequency of the <carrier wave> you want. I.e. you use a <bandpass filter>.
* <amplification>: otherwise you won't be able to hear anything if the emitter is too far away
* <demodulation>: this means decoding the signal based on whatever way it was encoded, notably e.g. <AM>/<FM>