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Definition of "Pulse-Frequency Modulation" |
[PFM] Pulse modulation in which the modulating voltage varies the repetition rate of a pulse train. Modulation in which the pulse repetition rate is varied in accordance with some characteristic of the modulating signal. / Pulse-Frequency Modulation is a modulation method for representing an analog signal using only two levels 1 and 0. It is analogous to Pulse-Width Modulation, in which the magnitude of an analog signal is encoded in the duty cycle of a square wave. Unlike PWM, in which the width of square pulses is varied at constant frequency, PFM is accomplished using fixed-duration pulses and varying the repetition rate thereof. In other words, the frequency of the pulse train is varied in accordance with the instantaneous amplitude of the modulating signal at sampling intervals. / Noise Modulation that is the result of modulation, demodulation, and any nonlinear characteristics of the transmission medium or transmission system components. |
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