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Most commonly used modulation system for telegraphy is ________

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Most commonly used modulation system for telegraphy is ________

(a) Multi-tone modulation

(b) Single tone modulation

(c) PCM

(d) FSK

This question was posed to me by my college professor while I was bunking the class.

My enquiry is from Detection of AM Waves in portion Amplitude Modulation of Analog Communications

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Right option is (d) FSK

Explanation: FSK (Frequency Shift Keying) is a method to transmit digital signals, which are in form of binary data. In telegraphy, a modem is used to convert binary data to FSK and vice-versa, for communication between computers, over telephone lines. Single tone modulations deals with message signal having single frequency component, whereas, Multi-tone modulation deals with message signal having multiple frequency components.

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