DSB-SC, VSB and SSB modulation are types of:

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RRB JE ECE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. Frequency Modulation (FM)
  2. Amplitude Modulation (AM)
  3. Phase Modulation (PM)
  4. Digital Modulation

Answer (Detailed Solution Below)

Option 2 : Amplitude Modulation (AM)
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The correct answer is: 2) Amplitude Modulation (AM)

Explanation:

DSB-SC, VSB, and SSB are all variants of Amplitude Modulation (AM), where the amplitude of the carrier signal is varied in proportion to the message signal. Here’s how they differ:

  1. DSB-SC (Double Sideband Suppressed Carrier)

    • Transmits both sidebands but suppresses the carrier.

    • More power-efficient than standard AM but requires coherent detection.

  2. VSB (Vestigial Sideband)

    • compromise between DSB and SSB, transmitting one full sideband + part of the other.

    • Used in TV broadcasting (e.g., analog NTSC/PAL signals).

  3. SSB (Single Sideband)

    • Transmits only one sideband (either USB or LSB) and suppresses the carrier.

    • Maximizes bandwidth and power efficiency (used in HF radio, military comms).

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