KNOW THE SIGNAL AND SYSTEM AND INSTALL IT IN YOURSELF

ONE DAY A QUESTION COMES IN MY MIND THAT

. Why Use Frequency Representations When We Can Represent Any Signal With

 Time Functions?

THEN I FIND A ANSWER THAT CAN CLEAR IT IN VERY SIMPLE VIEW BUT BEFORE THIS IT MUST BE

 UNDERSTAND THAT "TIME CAN NOT CONTROLLED BY SOMEONE BECAUSE OUR UNIVERSE

 IS UNIDIRECTIONAL TIME BINDED AND WE ARE LIVING IN A  CLOSE LOOP OF TIME" THIS IS

QUANTUM PHYSICS APPROACH NOW COMES ON MAIN TOPIC ANSWER IS THAT

. Frequency methods focus on how signals of different frequencies are represented in a signal. We think in terms of the spectrum of the signal.  Here is a rainbow.  In a rainbow, white sunlight - composed of many different colors or parts of the spectrum - is spread into its spectrum.  Here the atmosphere is a filter that treats the different parts of the light spectrum - the different light frequencies - in different ways.  For a rainbow, the different parts of the light spectrum - the different colors - are bent differently as they enter the atmosphere.  In many electrical circuits and systems, the different parts of the signal spectrum  are treated differently.  Different treatment of different parts of the electromagnetic spectrum means that you can separate out different radio, television and cell phone signals.  That gives you one very strong reason to learn about frequency methods.  In a linear system, frequency methods may be easier to apply, and may give insight you would not get otherwise.