what is need of modulation & de-modulation in communication?
- 6 Answers
- 6905 Views
- I also Faced
- E-Mail Answers
Answer Posted / reza r
Modulation is used in order to achieve some of the followings:
1- To put the signal on a carrier frequency we have, for
example we have a channel that can only carry frequencies
between 30~31MHz, an we have to transfer our speech over
this channel (Bandwidth of speech is 0~4KHz), so we use
modulation to mount the signal over the available channel.
2- To minimize the destructive channel effects such as
noise, interference and so on. destructive effects will vary
on the different frequencies.
3- in order to decrease the size of the antenna! (antenna
size depends on the Landa (wavelength of the signal). The
higher the frequency, the lower the wavelength. The lower
the wavelength, the smaller the antenna size!
also there is some other benefits in modulation...
| Is This Answer Correct ? | 0 Yes | 2 No |
Post New Answer View All Answers
why the exchang voltge is in minus polarty i.e -48 instead of +48
Tell me is there any junction in conductor?
Write down the expression for average output voltage for step up chopper?
Explain what is an excitation table?
Which type of power plant is more easier to produce electrical power at economical condition?
sir,did u send me hpcl syllabus for engg. disiplience & previous year
What is current commutation?
please provide me the previous technical papers for ece branch conducted by hpcl
In ics the substrate is not employed as collector. Explain why?
Suppose in market 4n27 is not easily available so which opto isolator can I use at the place of this? What is 4n27
What is a bcd?
Explain how to program micro controller?
What is the conductivity of perfect dielectric?
Explain the difference allen bradley and siemens plc
What is non-weighted code?
