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FSK system involves ________

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FSK system involves ________

(a) frequency modulation

(b) pulse modulation

(c) amplitude modulation

(d) phase modulation

I got this question in unit test.

The above asked question is from Detection of AM Waves topic in portion Amplitude Modulation of Analog Communications

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Correct option is (a) frequency modulation

The explanation is: FSK (Frequency Shift Keying) is a method to transmit digital signals, which are in form of binary data. FSK i.e. Frequency Shift Keying involves frequency modulation that assigns bit values to discrete frequency while ASK assigns bit values to discrete amplitude.

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