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Which of the following Pulse time Modulation does not exist in practice?

Which of the following Pulse time Modulation does not exist in practice? Correct Answer <p>PFM</p>

PFM does not exist in practice

Additional Information

PWM

The amplitude and position of pulses are constant in modulated signal (PWM), but the width (or duration) of pulses varies proportionally with the amplitude of an analog useful signal.

The carrier signal is produced by a clock.

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PPM

The amplitude and width of pulses are constant in a modulated signal (PPM), but the direction of pulses varies proportionally with the amplitude of analogical useful signal.

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PAM

The width and location of pulses in a modulated signal (PAM) are constant, while the amplitude of pulses varies proportionally with the amplitude of an analogical useful signal.

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