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Pulse-width modulation

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Pulse width modulation is a way to represent data over a communications channel. With pulse width modulation, the value of a sample of data is represented by the length of a pulse.

Pulses of various lengths (the information itself) will be sent at regular intervals (the carrier frequency of the modulation). 

          _      _      _      _      _      _      _      _     
         | |    | |    | |    | |    | |    | |    | |    | |    
Clock    | |    | |    | |    | |    | |    | |    | |    | |    
       __| |____| |____| |____| |____| |____| |____| |____| |____


                 _      __     ____          ____   _
Data            | |    |  |   |    |        |    | | |
                | |    |  |   |    |        |    | | |
       _________| |____|  |___|    |________|    |_| |___________


Data     0      1      2      4      0      4      1      0


See also: Modulation, Pulse code modulation, Pulse amplitude modulation, Pulse position modulation

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