The amplitude modulation signal without a carrier is known as

Question

The amplitude modulation signal without a carrier is known as

1. A. SSB-SC
2. B. DSB-SC (Correct answer)
3. C. Both A and B
4. D. None of the above

Correct Answer

Option B — DSB-SC

Detailed Solution & Explanation

The correct answer is DSB-SC.

Key Points

• DSB-SC stands for Double Sideband Suppressed Carrier — an amplitude-modulated signal transmitted without its carrier.
• The carrier itself conveys no information, so suppressing it saves a large share of the transmitted power; in full AM the carrier can consume up to two-thirds of the total.
• SSB-SC also suppresses the carrier, but in addition removes one of the two sidebands, so it is not simply "AM without a carrier".

Additional Information

• DSB-SC is generated using a balanced modulator, which cancels the carrier while retaining both sidebands.
• Demodulation requires coherent (synchronous) detection, because a simple envelope detector cannot recover a signal whose carrier has been removed.