karthik said:
What is the difference between the Digital signals and Analog signals
If anyone explain me pls
Analog values are represented by ANALOGOUS quantities in other systems. In
analog system we can uses continuously variable quantities such as, but not
limited to: mechanical rotation, voltage, current, distance, etc to
represent other quantities. Analog values are not limited to electronics.
For instance the loudness of my car radio is proportional to the position of
my volume control. The position of a fuel gauge is proportional to the level
of voltage or current sent to my cars fuel gauge which is proportional to
the level of fuel in my fuel tank. An analog voltmeter uses the angle of the
meters needle to represent a particular voltage whereas a digital voltmeter
uses discrete digits to represent this voltage. Analog values have the
advantage of being continuously variable but tend to lack precision because
smaller and smaller quantities begin getting lost in "noise". One example of
this limit is that I cannot measure 1.000001 volts with an analog meter
because my eye cannot see one millionth of a division assuming I even had
such divisions on the meter scale.
Digital values are represented by DIGITS and change in discrete, or
definite, amounts. In digital systems we use discrete quantities such as,
but not limited to: incremental rotation (remember the old-style digital
clocks with numbers printed on a rotating ring), incremental voltage (not
limited to high and low), incremental current, incremental distance, voltage
or no voltage, etc to represent digits and use the position of these digits
to represent larger and larger numbers. Digital systems are not limited to
electronics. These digits can be represented by beads on an abacus, fingers
on a hand or patterns of binary 1's (+5v) and 0's (0v) in a computer.
Digital systems lack the ability to be continuously variable (try reading a
digital voltmeter while measuring a varying voltage) but we can obtain any
level of precision we want in a digital system by adding more digits to the
system. For instance, in general, a 32 bit computer is capable of much more
precision than a 4 bit computer (I say "in general" because a 4 bit computer
could be programmed to "act like" a 32 bit computer).
Hope this helps
Dorian