pulse-numbers modulation

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pulse-numbers modulation [′pəls ¦nəm·bərz ‚mäj·ə‚lā·shən]

(communications)

Modulation in which a pulse carrier's pulse density per unit time varies in accordance with a modulating wave, by making systematic omissions without changing the phase or amplitude of the transmitted pulses; as an example, the omission of every other pulse could correspond to zero modulation; the reinsertion of some or all pulses then corresponds to positive modulation, and the omission of more than every other pulse corresponds to negative modulation.

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