Modulation
for efficient transmission
Signal
transmitting over appreciable distance always involves a traveling
electromagnetic wave. The efficiency of any particular transmission method depends
upon the frequency of the signal being transmitted. By exploit in the frequency
translation property of modulation the message can be inserted into carrier
which has the frequency selected for the desired transmission method.
Modulation
to overcome hardware limitation
The
design of the communication may be constrict by the cost availability of the hardware,
performance of the hardware often depends on the frequencies involved.
Modulation permits that designer to place a signal in some frequency range that
avoids the hardware limitation.
Modulation
to reduce noise and interferences
A
method for overcoming noise and interferences is to increase signal power until
it overcomes the contamination. But increasing power is costly and may damage
the equipments. Fortunately FM and certain other types of modulations have a valuable
property of suppressing both noise and interferences.
Modulation
for frequency assignment
When
we tune a radio or television, particular station we are selecting one of the
many signals being received at that time. Since each station has a different
assigned carried frequency that desired signal can be separated from the others
by filtering.
Throughout this article I hope you may get some thing.
This provides very basic explanation and future will cover more. Comments are well come. Thank you.
