ANALOG SIGNAL

analog signal

ANALOG SIGNAL:

  “Analog signal is a kind continuous wave signal that changes maximum time its value. Quantity is one having continuous values most things that can be measured quantitative appear in nature in analog. Analog signal use decimal number system to process.” 

Analog signal is described using amplitude, time period or frequency and phase amplitude marks the maximum height of the signal. An analog system has infinite range of value.

For example: The air temperature changes over a continuous range of value when it changes it value form 20 C to 30 C during given day. It do not change its value instantaneous from 20 to 30 it take all infinite value between them to reach maximum.

Other examples are time, pressure, distance and sound etc.

ADVANTAGES OF ANALOG SIGNAL:

           ·         Use less bandwidth

           ·         Signals are more accurate

DISADVANTAGES OF ANALOG SIGNAL:

           ·         The effect of random noise can make the signal loss and distortion.

           ·         When the signal comes with noise and distortion then it is impossible to recover original

Definition of the terms which described an analog signal.

TIME PERIOD:

  The time required to complete one cycle of a wave signal. It is denote by ‘T’.

FREQUENCY:

  The rate of change in time period or the reciprocal of the time period. Rate of change in T means how many cycles complete in one second.

F= 1/T and also T=1/f

AMPLITUDE :

The maximum distance move by a point on the vibrating body. Where phase amplitude marks the maximum height of signal.

analog signal features

DUTY CYCLE:

  Duty cycle is the ratio of on time and the pulse width of the time period. This is denoted by D.C, Where %D.C is equal to

                                        %D.C =    tw / t on   x 100

                                                              T

duty cycle 

%D.C =   25  x 100

     150

%D.C = 16.7

EXAMPLE OF ANALOG SIGNAL:

examples of analog signal

  Some analog signal examples are

         *  Analog Audio Signal

         *  The instantaneous Voltage Signal

         *  Heart Beat Signal

         *  Air Temperature

         *  Speed Reading  Meter in vehicles.

         *  Wave 

         

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