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DSB-SC (Double Sideband Suppressed Carrier) Video Lecture | Electrical Engineering Optional Notes for UPSC

FAQs on DSB-SC (Double Sideband Suppressed Carrier) Video Lecture - Electrical Engineering Optional Notes for UPSC

$1. What is DSB-SC modulation and how does it differ from conventional AM?

Ans. DSB-SC (Double Sideband Suppressed Carrier) modulation is a form of amplitude modulation where the carrier signal is suppressed, and only the sidebands are transmitted. This technique improves spectral efficiency and reduces power consumption since the carrier does not carry any information. In conventional AM, the carrier is transmitted along with the sidebands, which leads to redundancy and increased power usage. DSB-SC is particularly useful for coherent detection and has applications in communications systems.

$2. What are the advantages of using DSB-SC modulation in communication systems?

Ans. The advantages of DSB-SC modulation include improved power efficiency, as it eliminates the need to transmit the carrier signal, which does not contain any information. This results in a reduction of the average power required for transmission. Additionally, DSB-SC can achieve better bandwidth utilization since the bandwidth is occupied only by the information-carrying sidebands. It also allows for easier demodulation with coherent detection methods, enhancing signal quality.

$3. How is the demodulation process of DSB-SC performed?

Ans. Demodulation of DSB-SC signals typically involves the use of a coherent detector. In this process, the received signal is multiplied by a locally generated carrier signal that is synchronized in phase and frequency with the original carrier. This multiplication process results in the recovery of the original message signal, as the carrier component is effectively reintroduced. The output is then passed through a low-pass filter to eliminate high-frequency components, leaving only the desired message signal.

$4. What are some practical applications of DSB-SC modulation?

Ans. DSB-SC modulation is widely used in various applications, including two-way radio communications, television broadcasting, and in some satellite communications systems. It is particularly useful in scenarios where bandwidth efficiency is crucial. Additionally, DSB-SC is employed in the transmission of audio signals over radio frequencies, where the reduction of power usage and improved signal clarity are significant benefits.

$5. What are the limitations of DSB-SC modulation compared to other modulation techniques?

Ans. While DSB-SC modulation offers several advantages, it also has limitations. One major drawback is that it requires coherent detection, meaning the receiver must have a precise phase and frequency reference for the carrier signal. This can complicate receiver design and implementation. Furthermore, DSB-SC is more susceptible to noise compared to other modulation schemes like single sideband (SSB) or frequency modulation (FM), which can impact the quality of the transmitted signal in noisy environments.

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Sep 06, 2025 Last updated

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Video Description: DSB-SC (Double Sideband Suppressed Carrier) for UPSC 2025 is part of Electrical Engineering Optional Notes for UPSC preparation. The notes and questions for DSB-SC (Double Sideband Suppressed Carrier) have been prepared according to the UPSC exam syllabus. Information about DSB-SC (Double Sideband Suppressed Carrier) covers all important topics for UPSC 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for DSB-SC (Double Sideband Suppressed Carrier).

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