: The process of generating a new signal waveform from an original signal (like a microphone output) to better withstand noise or travel over long distances. Noise Suppression
Detailed analysis of Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM). Digital Communication: principles of communication systems taub schilling pdf
Principles of Communication Systems by Herbert Taub and Donald L. Schilling is a seminal textbook primarily focused on the fundamental theory : The process of generating a new signal
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Is for your reference