modulation
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The amplitude, duration, and timing of a series of pulses are controlled in pulse-code modulation, which is relatively simple for digital data already in binary code. Analogue signals need to be converted into a recognizable binary code (a pulse-amplitude modulated signal) by regular sampling of its amplitude. Morse code is a very simple example of pulse-code modulation.
In radio transmission, the variation of frequency, or amplitude, of a radio carrier wave, in accordance with the audio characteristics of the speaking voice, music, or other signal being transmitted.
| See also pulse-code modulation. |
modulation
In music, movement from one key to another. In classical dance music, modulation is a guide to phrasing rhythm to the step pattern.
Electronic modulation of live or prerecorded instrumental sound is also used to create unusual timbres, as in Stockhausen's Mixtur 1964–67 for instrumental groups and ring modulation.
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