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Where is ASK used?

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Where is ASK used?

(a) Binary data transmission

(b) Analog data transmission

(c) TV waves transmission

(d) Audio signal transmission

I got this question during an online exam.

The question is from Sidebands and Frequency Domain in division Amplitude & Frequency Modulation of Avionics

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The correct choice is (a) Binary data transmission

The explanation is: Amplitude modulation by square waves or rectangular binary pulses is referred to as amplitude-shift keying (ASK). ASK is used in some types of data communication when binary information is to be transmitted.

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