pulse-code modulation
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Pulse-code Modulation
 by regular sampling of its amplitude. Morse code is a very simple example of pulse-code modulation.', copy:'(Image © RM)'});)
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In physics, a form of digital modulation in which radio waves, microwaves, light waves, or other ‘carrier waves’ are switched on and off in pulses of varying length according to a binary code. It is a relatively simple matter to transmit data that are already in binary code, such as those used by computer, by these means. However, if an analogue audio signal is to be transmitted, it must first be converted to a pulse-amplitude modulated signal (PAM) by regular sampling of its amplitude. The value of the amplitude is then converted into a binary code for transmission on the carrier wave.
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