what is need of modulation & de-modulation in communication?
Answer Posted / daniel joel
modulation is the process of changing the characteristics of
high frequency signal (carrier signal) like
amplitude,phase,frequency with reference to a low frequency
signal(message signal).
Need of modulation is 1.To decrease the antenna height
*to transmit a low frequency signal we need height of
antenna to be very large(since wavelength is inversly
proportional to frequency.so if we modulate a low frequency
signal with a high frequency one then it requires antenna
height of just meters,which is practically possible.
2.To avoid interference in the channel we adopt modulation.
3.To overcome noise in the channel.
Demodulation is necessary to retrive back the message signal
from modulated signal.
Is This Answer Correct ? | 0 Yes | 1 No |
Post New Answer View All Answers
For the cmrr to be infinite what will be the condition?
How rectangular filter are practically made?
what are the test requirment fot protocol testing (for SS7,SIP)
In Traffic Manager, What is the Use for Zero (0) timeslot.
What is the main drawback of a single phase half bridge inverter?
What are the KPI that decides the capacity expansion of GGSN/xGW?
Test on three subjects Physics, Chemistry & Biology are to be conducted simultaneously the number of candidates for the tests are 68, 36 and 72 respectively. Candidates are to be seated in different rooms such that each room will have candidates of the same subject and the load on each invigilator be the same i.e. the number of candidates in each room should be the same what is the minimum number of rooms you need for the purpose
why to study at university of new haven ?
What are the dc,ac characteristics of op-amp?
How the active power factor correction changes the wave shape of current drawn by a load to improve the power factor?
WHAT R THE DIFFERENT CONFIGURATIONS OF FPGA
Is the stealth technology is based on the "Reflection coefficient of the material? What are the other factors that affect to optimize this technology
Which type of power plant is more easier to produce electrical power at economical condition?
How to calibrate differential pressure switch
What is a bcd?