IGNOU PHE 16 2026 - State the various techniques used for analog modulation of a digital s

Question

State the various techniques used for analog modulation of a digital signal carrier. How are they used for continuous wave transmission and two tone modulation systems? State the advantages of two tone modulation system.

28 Jan 2026

Answer :

Word Count : 274

Analog modulation techniques used for transmitting a digital signal over a carrier involve varying a continuous sinusoidal carrier in accordance with discrete digital data. The principal techniques are Amplitude Shift Keying, Frequency Shift Keying, Phase Shift Keying, and its extension Quadrature Amplitude Modulation. In Amplitude Shift Keying, the amplitude of a continuous carrier is switched between predetermined levels corresponding to binary symbols, while frequency and phase remain constant. In Frequency Shift Keying, the carrier frequency is shifted between discrete values according to the digital input, maintaining constant amplitude. Phase Shift Keying varies the phase of the carrier in discrete steps to represent digital symbols, and Quadrature Amplitude Modulation combines both

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