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Signal modulation
Modulation involves the modification of some property of a (usually sinusoidal) carrier waveform. The process of recovering the original signal from the modulated signal is called 'demodulation'. The most common modulation methods are:• amplitude modulation• frequency modulation• pulse code modulation.Modulation of a high frequency carrier by a lower frequency signal allows:
• convenient transmission by high frequency radio waves • shifting of the frequency range occupied by a signal so that multiple signals can be packed into the available bandwidth of the communication link and transmitted simultaneously.
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