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Who invented the superheterodyne receivers?

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Who invented the superheterodyne receivers?

(a) Hertz

(b) Armstrong

(c) Foster

(d) Seeley

This question was addressed to me during an online interview.

My doubt is from Bandwidth of FM Signal with Arbitrary m(t) in division Angle Modulation of Analog Communications

1 Answer

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Best answer
Correct answer is (b) Armstrong

The best explanation: Superheterodyne uses frequency mixing to convert a received RF signal to a fixed IF(intermediate frequency). This method is known as heterodyning.  This IF can be processed more easily than the original carrier frequency. It was invented by Armstrong.

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