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Which of the following type of multiplexing uses pulse code modulation?

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Which of the following type of multiplexing uses pulse code modulation?

(a) Frequency division multiplexing

(b) Time division multiplexing

(c) Code division multiplexing

(d) Amplitude limited multiplexing

This question was posed to me in an interview.

My question is taken from Pulse Code Modulation in chapter Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

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The correct answer is (b) Time division multiplexing

Easy explanation: The most popular form of TDM uses pulse-code modulation (PCM), in which multiple channels of digital data are transmitted in serial form. Each channel is assigned a time slot in which to transmit one binary word of data. The data streams from the various channels are interleaved and transmitted sequentially.

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