#modulation  (electronics) the transmission of a signal by imposing it on a carrier wave by changing the carrier's amplitude or frequency or phase
  supertype:  transmission  communication by means of transmitted signals
  subtype:  amplitude_modulation__amplitudemodulation__AM  modulation of the amplitude of the (radio) carrier wave
  subtype:  frequency_modulation__frequencymodulation__FM  modulation of the frequency of the (radio) carrier wave
  subtype:  phase_modulation__phasemodulation__PM  modulation of the phase of the carrier wave
  subtype:  pulse_modulation__pulsemodulation  modulation that imposes a signal on a train of pulses
     subtype:  pulse-time_modulation  modulation of the time between successive pulses

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