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Which circuit does the actual multiplexing process in frequency division multiplexing?

Which circuit does the actual multiplexing process in frequency division multiplexing? Correct Answer Linear mixer

The modulator outputs containing the sideband information are added algebraically in a linear mixer; no modulation or generation of sidebands takes place. The resulting output signal is a composite of all the modulated subcarriers. This signal can be used to modulate a radio transmitter or can itself be transmitted over the single communication channel. Alternatively, the composite signal can become one input to another multiplexed system.

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