Answer / kelvin

1:to transmit a signal over long distance
2:it reduce the antenna size
3:it increase the signal to noise ratio
4:the process permit changing the signal frequency to a pre-assigned band

Answer / saqeeb momin

The process of shifting the baseband signal into passband signal is known as modulation.

Answer / akash nag

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 / trupti

What modulation basically does is to combine a (low
frequency) signal with a (high frequency) carrier. Everyone
who wants to 'speak' is assigned a discrete frequency for
his carrier. Anyone who wants to 'listen' to a particular
speaker, simply 'tunes' up to that carrier frequency.
Obviously then, the process of modulation is reversible. In
other words, the signal is simply encoded using the carrier
and is decoded accordingly by the listener
for example:->
One of the main problems with communication is that
everyone wants to speak at the same time. This causes major
headaches for the person who wishes to listen. It is simply
not possible to distinguish one signal from the other due
to interference. Modulation is a way to solve this problem.

Answer / anshul tejan

need= to carry information or data or bits or voice which is of low frequency to your destination with the help of carrier signal which is of high frequency.

Answer / rahulsyal

basically modulation is used to reduce the antenna height , increase bandwidth , to reduce the interference made , to reduce the noise and distortions

Answer / manish godwany

baseband signal(low frequency signal) cannot travel to a
large distance so it is mixed with a high frequency signal
(carier signal) so that it can travel to a large distance
without attenuation.

Answer / nisha*mwsad

modulation it is the process of varying a perodic waveform

Answer / preetham

Disclaimer: I don't know much about this. I am just
elaborating my understanding in a better way, after reading
the explanation from Radhar, credits to him/her.

Say I( for Information;-) needs to travel from Point T
(transmitter) to Point R (Receiver).
There can be several medium through which I can travel.
1. Air
2. Water
3. Road
4. Rail

There are several type of Carriers vehicle I can choose to
travel in the Medium.
1. By Train
2. By Bus
3. By Aircraft
4. By a Boat
5. By a Bicycle/Walk

Now the question is how to go? What carrier to choose?
1. How fast I have to travel. ( Certain carriers are faster
than others )
2. How far I have to travel. ( Certain carriers makes I
less fatigued (Information loss))
3. How much does it cost me. ( Carriers with more bandwidth
are generally less costly )
4. Availability of the Carrier (Bandwidth, clearly ships
have more space than buses on trains, but are slower)
5. What medium do want to travel ( Certain carriers are
better suited to travel in a particular medium than others)

Now you guys do rest of math based on this analogy.

Answer / maha devi

TO Transmit the signal over the line without loss . low
freqency signals are converted into high freqency signals,
that is why the transmission speed is increased.

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