Answer / kamaljeet singh sidhu

The process of changing the properties of carrier signal
according to the modulating signal is known as MODULATION.

The process recovering the modulating signal from the
modulated signal is known as DEMODULATION

Answer / varun

low frequency is not suitable for long distance
communication. so we uses modulation technique to make it.

Answer / ramesh kumar

low frequency is not suitable for long distance
communication. so we uses modulation technique to make it
and retrieving again these signal back to original signal
is called demodulation.

Answer / ashwani pandey

Modulation is the process of changing the characterstic of
carrier signal
according to the modulating signal is known as MODULATION.

Demodulation is the process recovering the modulating
signal from the
modulated signal is known as DEMODULATION

Answer / syncopator

If we radiate a simple r.f. carrier it conveys no information other than the fact that its transmitter is working. Not much use is it?

The name "carrier" suggests that it is capable of carrying information.

The information is applied to the carrier so that the carrier's characteristics are changed. It is these changes which represent the information being carried.

Changes to the carrier's characteristics are called modulation.

The two most common ways that the information can change its carrier's characteristic are by altering the amplitude of the carrier (it should come as no surprise to learn that this is called amplitude modulation, abbreviated to a.m.), and by altering the frequency of the carrier (which, of course, is f.m.)

The process of recovering the information imposed upon a carrier (the modulation) is called demodulation or detection.

Exactly the same processes are encountered in audio.

If an audio note has its amplitude varied (modulated) to and fro (up and down) it is called tremolo - in r.f. we call it a.m. (it's the same thing).

If an audio note has its frequency varied back and forth, it is called vibrato - in r.f. we call it f.m. (it's the same thing).

Answer / nitesh

if we use low freq signal then we ave to increase the
antenna hight so we are modulating to higher freq and
demodulating it back in recver side

Answer / nikky

the process of changing the incoming waves according to its
receiving device called modulation.
change the output of modulation into its actual form called
demodultion

Hi i am going to attend the interview for BHEL. can you please help out in knowing about the area of preparation. I am apprearing for supervisior trainee post. Please share your views on this. Thanks (frm hydrabad)

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