Discussion
Why does an FM discriminator's output noise rise with frequency?
Answer: A
Frequency is the derivative of phase, so a discriminator differentiates and therefore multiplies the noise spectrum by frequency, giving the triangular output noise that pre-emphasis exists to counter. Integration would produce the opposite slope, which is what a phase detector effectively delivers. The tuned circuits pass the whole baseband. And the limiter acts on amplitude rather than on baseband frequency. One mathematical operation explains the noise shape and hence a whole audio processing convention.
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