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as per google:
What is Modulation (in computer networking)? Modulation is the process by which information is encoded into electrical signals for transmission over a medium. Binary information, as represented by a series of 1s and 0s, must be converted to analog or digital electrical signals for transmission.
Digital modulation methods can be considered as digital-to-analog conversion and the corresponding demodulation or detection as analog-to-digital conversion.
https://en.wikipedia.org/wiki/Modulation#Digital_modulation_methods
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