Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
384 views
in General by (240k points)
closed by
The threshold effect in demodulators is 
1. exhibited by all demodulators when the input signal to nose ratio is low
2. rapid fall on output signal to noise ratio when the input signal to noise ration falls below a particular value 
3. properly exhibited by correlation receivers 
4. properly exhibited by all AM suppressed carrier coherent demodulators. 

1 Answer

0 votes
by (238k points)
selected by
 
Best answer
Correct Answer - Option 2 : rapid fall on output signal to noise ratio when the input signal to noise ration falls below a particular value 
  • When the value of the input signal to noise ratio falls below a particular value (called Threshold value), a rapid fall of the output signal to noise ratio is observed by the receiver. This is known as the Threshold effect in demodulation.
  • The threshold effect occurs due to the presence of large noise in the modulated signal.

 

Important Point:

  • Due to the threshold effect, the detection of the message signal becomes difficult.
  • The threshold effect can be improved by applying feedback in demodulator circuits such as phase-locked loops and frequency locked loops. So that the output SNR value does not fall rapidly.

 

The relation between input SNR and output SNR is

(SNR)Output = 3β2.(SNR)Input

Where, β = modulation index in FM.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...