题目内容
There are various forms of modulation, but not each designed to alter a particular characteristic of carrier wave.
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Amplitude modulation(AM) is the modulation method used in the FM radio broadcast band.
In a digital signal, the information is encoded as a set of discrete values.
Demodulation is the act of extracting the original information signal from a modulated carrier wave.
The FM band has become the choice of music listeners because of its high-noise, wide-bandwidth qualities. It is also used for the audio portion of a television broadcast.
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