Discussion
Which statement about noise bandwidth is correct?
Answer: B
Noise bandwidth is the width of an ideal rectangular filter that would admit the same noise power as the real filter, which is what makes a single number usable in the \( kTB \) calculation. It is close to but generally a little wider than the 3 dB bandwidth, because a real filter's skirts admit noise beyond its nominal edge. It is a property of the receiver's filtering wherever that sits. And it is independent of the modulation index, though the index does dictate what bandwidth the receiver must provide. Replacing an awkward shape with an equivalent rectangle is a standard move, and knowing it is an equivalence rather than an identity keeps the small discrepancy from being puzzling.
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