Answer / starry

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

Answer / srikrishna

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

Answer / radhar

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.

Answer / sree

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.

Answer / akanchha gupta

some basicneeds are:-
(1)multiplexing
(2)practiability of anteena

Answer / kamalakannan.l

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.

Answer / vignesh.a

Low freq signals can't be transmitted for long distance.
Thats why we are modulating the informtion signals.

Answer / girija shankar

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.

Answer / guest

modulation is scheme under which the the signal is first
modified to suitable form(compress or amplied)and mixwd
with the carrier for trassmission

Answer / kabir

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

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