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A heterodyne frequency changer is ________

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A heterodyne frequency changer is ________

(a) Mixer

(b) Demodulator

(c) Modulator

(d) Local Oscillator

The 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

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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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