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Question
What is the need for modulation?
 Question Submitted By :: Electronics-Communications
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
NEED FOR MODULATION
1) TO REDUCE THE ANTENNA HEIGHT
2) TO MULTIPLEX THE MORE NUMBER OF SIGNALS
3) TO REDUCE THE NOISE & DISTORTIONS
4) TO NARROW BANDING THE SIGNAL
5) TO REDUCE EQUIPMENT COMPLEXITY
 
Is This Answer Correct ?    536 Yes 26 No
Starry
 
Answer
# 2
modulation is neede basically to

i)to increase the bandwidth of the signal
ii)to multiplex the signals
iii)to reduce the interferencemade when we transmit the
signals with nearly same frequency in the audio frequency
range (20-20k)hz.
iv)to favour the complexity of the transmission system
 
Is This Answer Correct ?    302 Yes 40 No
Srikrishna
 
 
 
Answer
# 3
for example if a person is sitting at the bus to go to hyd.
there is a bus which will go to the hyd. it is not the
matter that if the bus goes to the hyd he will also go.
he will also go to the hyd only when he sit in the bus.
here the bus is the carrier & the man is the information.
from this it is clear that modulation is why because the
information which is having less power can't travel large
distances that will put on the carrier which is having
large power that it can travel large distances.
 
Is This Answer Correct ?    274 Yes 50 No
Radhar
 
Answer
# 4
some basicneeds are:-
(1)multiplexing
(2)practiability of anteena
 
Is This Answer Correct ?    265 Yes 71 No
Akanchha Gupta
 
Answer
# 5
1)in shortly it improves the signal strength . means the low
frequency signal can't transmit long distance here low
frequency signal means low strength (weak signal) ,when we
modulate that signal it can be transmitted long distance.
while it transmit long distance i.e., nothing but it's
strength s improves.
2) reduces noise or distortion.
3) multiplexing means we r using frequency translation theorem.
4) we transmit large amount of information at long
distances.i.e., narrow banding the signal.
5) reduce antenna height.
6) we can change the information from one form to another
form. i.e., encryption of data. thats whys we hiding the
information without any hackings.
 
Is This Answer Correct ?    197 Yes 27 No
Sree
 
Answer
# 6
Need of Modulation:

To transfer the message signal from one site another site
without any loss for that we are using modulation.

Modulation classified in three types.

1.Amplitude modulation.
2.Frequency Modulation.
3.Phase Modulation.
 
Is This Answer Correct ?    249 Yes 119 No
Kamalakannan.l
 
Answer
# 7
Low freq signals can't be transmitted for long distance.
Thats why we are modulating the informtion signals.
 
Is This Answer Correct ?    140 Yes 41 No
Vignesh.a
 
Answer
# 8
BASIC NEED FOR MODULATION IS:
1.TO REDUCE ANTENNA HEIGHT
2.TRANSMIT THE INFORMATION TO MORE DISTANCE WITH OUT
INTERFERENCE
3.TO REDUCE BAND WIDTH
EX:SUPPOSE IF U WANT THROUGH A PAPER HAVING INFORMATION TO
YOUR OPP APPARTMENT FROM YOUR APPARTMENT(EX:D=500cm)IF U
SIMPLY THROUGH A PAPER IT WILL NEVER REACH TO THE OPP
APPARTMENT BUT IF YOU USE A STONE.i.e COMBINELY WE CAN
THROUGH BECAUSE STONE HAVE WEIGHT LIKE WISE CARRIER HAVE
MORE POWER THAN BASE SIGNAL THAN WE CAN TRANSMITE THE
SIGNAL.
 
Is This Answer Correct ?    105 Yes 30 No
Girija Shankar
 
Answer
# 9
modulation is scheme under which the the signal is first
modified to suitable form(compress or amplied)and mixwd
with the carrier for trassmission
 
Is This Answer Correct ?    228 Yes 171 No
Guest
 
Answer
# 10
Modulation is a process in which the characteristics of a
signal circuit is caried in accordance with the information
signal which is to be transmitted.
The modulation signal,which is to be transmitted isknown
as Modulating signal.
Need for modulation:
i)multiplexing
ii)practicability of antennas height
iii)frequency conversion
 
Is This Answer Correct ?    62 Yes 29 No
Kabir
 

 
 
 
Other Electronics Communications Interview Questions
 
  Question Asked @ Answers
 
1.support that band limited signals are not realisable. and realisable signals are having infinte band width   1
IN AN OSCILLOSCOPE TWO COUPLING IS THERE, THAT IS AC & DC COUPLING, WHERE DO WE USE THESE COUPLINGS ? DRDO 2
in long range commn AM is very appropriate.why? Cisco 3
an unknown semiconductor has Eg=1.1ev and Nv=Nc.it is doped with 10^15 donors,where the donor level is 0.2ev below Ec. given that Ef is 0.25ev below Ec, calculate ni and the concentration of electrons and holes in the semiconductor at 300k.   1
what is the difference between 2G and 3G network?   2
Sparking between contacts can be reduced by inserting a a.) Resistance in the line b.) Capacitor in series with contacts c.) Capacitor in parallel with contacts d.) None BSNL 4
what is AM,FM,& PM IETE 2
What is the advantage of dsp   8
what is Active device and Passive device?   8
SIR VERY GOOD MORNING I AM APPERING FOR RRB EXAM FOR SECTION ENGINEER I REQUEST U TO PLZ FORWORD THE PAPER PATTERN AND EVEN PREVIOUS QUESTION PAPER SIR. I THINK U WILL SURELY HELP ME OUT IN EXAM. RRB 4
what are the advantage of pmmc?   2
diode made of which semicoductor has highest threshold voltage?   5
 
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