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PULSE MODULATION

 It is transmitted in digital form as a
  sequence of coded pulse.

                     Pulse
                     Modulation

        Analo                    Digita
        g                        l

i. Pulse amplitude   i. Pulse code
    modulation           modulation

ii. Pulse position   ii. Delta
    modulation           modulation

iii. Pulse duration  iii. Adaptive delta
    modulation       modulation
                     iv. Differential pulse
                     code modulation
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