Answer Posted / jyoti sheoran
MODULATION IS A SCHEME WHICH ALTERS SOME CHARACTERISTICS OF
THE HIGH FREQUENCY CARRIER IN ACCORDANCE WITH THE LOW
FREQUENCY MESSAGE SIGNAL CALLED THE MODULATING SIGNAL.
THERE ARE THREE TYPES OF MODULATION :-
1). AMPLITUDE MODULATION(AM) :-
IN THIS TYPE OF MODULATION
FREQUENCY AND PHASE REMAINS SAME, ONLY THE AMPLITUDE
CHANGES.
2). FREQUENCY MODULATION(FM) :-
IN FM THE PEAK AMPLITUDE
AND PHASE REMAINS CONSTANT BUT AS THE AMPLITUDE OF THE
INFORMATION CHANGES, THE FREQUENCY OF THE CARRIER CHANGES
CORRSEPONDINGLY.
3). PHASE MODULATION(PM) :-
PM IS USED IN THE SAME SYSTEM
AS AN ALTERNATIVE TO FREQUENCY MODULATION. IN PHASE
MODULATION, THE PHASE OF THE CARRIER SIGNAL IS MODULATED TO
FOLLOW THE CHANGING VOLTAGE LEVEL OF THE MODULATING SIGNAL.
NEED FOR MODULATION :-
1: EFFICIENT RADIATION
2: FREQUENCY TRANSLATION
3: MULTIPLEXING
4: REDUCTION OF NOISE
| Is This Answer Correct ? | 7 Yes | 0 No |
Post New Answer View All Answers
please anybody help me to find out the BHEL trainee Exam previous year questions papers . if u ve pls. send it to surekhared@gmail.com
The slip during plugging operation is given by= A 1-s B 2+s C 1+s D 2-s
How one can check the MAIN of a house wiring ?
how do you test tachos and servos
what is the voltage regulation for unity and zero power factor?
hey guys i scored 910 on GRE and 67 on TOEFL respectively.I have an aggregate of about 74%in my B tech.For which colleges should i apply for an MS program in electrical engineering.I am looking for colleges in NJ,SC,NC,GEORGIA, NY. Please reply with a good response.....
what is kondo syatem in eletrical traction
WHAT IS THE DIFFERENCE BETWEEN GENERAL INVERTER AND SOLOR INVERTER TELL ME PLZ
How to calculate the electrical load for a standard telecom BTS shelter and choose the DG set capacity for the same load?
hai now i am working as a electrical design engineer in construction field can i get a job in oil and gass field or power plant project as a electrical design engineer?
what is circuit recombiner and how it is different from circuit breaker
What is the main cause of magnetism?
does buccholz in a transformer use batteries
What are the advantages of nichols chart?
if sf6 gas low in gis what will happen
