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A heterodyne frequency changer is ________(a) Mixer(b) Demodulator(c) Modulator(d) Local OscillatorThe question was asked by my college professor while I was bunking the class.This intriguing question comes from Receiver topic in chapter Elements of Communication System of Analog Communications

Answer»

The correct choice is (a) Mixer

Easiest explanation: A mixer is a nonlinear electrical circuit that multiplies two signal frequencies applied to it, and produces a new frequency. Mixers are widely used to shift signals from one frequency RANGE to other, which is known as heterodyning PROCESS. Generally, LOCAL Oscillator generates a frequency to be applied at one of the input TERMINALS of the mixer. Demodulator decodes the MESSAGE signal from modulated signal, while modulator encodes message signal for transmission.



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