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Which of the following is used to generate PDM?

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Which of the following is used to generate PDM?

(a) Monostable multi-vibrator

(b) Bistable Multivibrator

(c) Either monostable of free running multi-vibrator

(d) Astable Multivibrator

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My question is taken from Frequency Discrimination Method in chapter SSB Modulation of Analog Communications

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Right option is (a) Monostable multi-vibrator

For explanation: Pulse density modulation (PDM) is used to represent an analog signal using a digital signal. For generating PDM, a monostable multi-vibrator is used, which is externally triggered and has only one stable state.

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