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Modulation

Modulation refers to the application of information onto a carrier signal by varying one or more of the signal’s basic characteristics (frequency, amplitude or phase); the conversion of a signal from its original (e.g., digital) format to analog format. Specific types include:

  • Amplitude modulation (AM)
  • Adaptive differential pulse code modulation (ADPCM)
  • Frequency modulation (FM)
  • Pulse amplitude modulation (PAM)
  • Pulse code modulation (PCM)
  • Pulse width modulation (PWN); also called pulse duration modulation, or PDM


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