Discussion
Why does an envelope detector fail on DSB-SC?
Answer: C
The detector responds to magnitude only, so it misses the phase reversals and delivers the rectified message instead of the message, which is severe distortion rather than a small error. Coherent detection is therefore mandatory. The time constant can be set correctly and still not help. The sidebands are certainly present, indeed they are all there is. And the diode does not saturate; it simply rectifies the wrong quantity. The three schemes differ on exactly two axes, power and bandwidth, and every question on the topic reduces to one of them.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development