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Which of the following device is used to demultiplex the received signal?(a) Allpass filters(b) Bandpass filters(c) Bandstop filters(d) Differential filtersThis question was addressed to me during an interview for a job.This intriguing question originated from Frequency Division Multiplexing in portion Radio Transmitters, Communication Receivers, Multiplexing and Demultiplexing of Avionics

Answer»

The correct answer is (b) Bandpass filters

Explanation: A RECEIVER PICKS up the SIGNAL and demodulates it, recovering the composite signal. This is sent to a group of bandpass filters, each centered on one of the carrier FREQUENCIES. Each filter passes only its CHANNEL and rejects all others. A channel demodulator then recovers each original input signal.



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