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Like a glass that resonates with soundTo understand how a radio receives signals, it helps to compare it to how a glass shatters when a singer hits a specific note: When the vibrations in the air match that particular frequency that the glass is tuned to, the glass resonates and absorbs the energy (and shatters if it absorbs too much). So, the glass is a kind of detector or receiver of a particular frequency of sound, and ignores all the other frequencies.

A radio basically works the same way, except instead of sound vibrations, it is tuned to pick up electromagnetic vibrations. It is tuned to a particular frequency, and picks up the signals with that frequency, just like how the glass picks up the signal from a specific frequency of sound in the air.

Basic principle behind every radio is the process of modulation (superimposition of signals on carrier waves collectively called baseband signal) and demodulation of radio waves.

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