# What are poles & zero in Real.......??

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#### MrAl

##### Well-Known Member
HI Sir,

You are giving good example, but for me it will be better if you have a small images showing this property in real world, it will be far better....

Thanks very much..!!

Here's a drawing of a sine wave (red) and a delayed sine wave (blue). Note the blue one is zero for 0.25 seconds because the delay factor for that wave is 0.25.

#### Attachments

• DelayedSine-01.gif
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#### koolguy

##### Active Member
I think this is in time domain, if we considered i\t freq. or e^-jwt how it will be shown??

Thanks.

#### MrAl

##### Well-Known Member
Hi again,

Is this what you wanted to see?

#### Attachments

• emjwT.gif
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#### koolguy

##### Active Member
From where you got this,that mean in freq. domain the freq. rise by to??

#### MrAl

##### Well-Known Member
Hello,

Not sure what you are asking. The table came from a book, "Engineering Circuit Analysis".

#### koolguy

##### Active Member
Its simple as in time domain, the signal is shifted in t sec. ,but-in freq. shifted upward only ,why ??

#### MrAl

##### Well-Known Member
What do you mean shifted upward?

#### koolguy

##### Active Member
Hello Sir,

I have shown in this image.....

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• 12.gif
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#### birdman0_o

##### Active Member
The Fourier transform of the delta function is the unit step. There is no "shifting upward" going on.

#### MrAl

##### Well-Known Member
Hello Sir,

I have shown in this image.....

That's because the amplitude of e^-jwt0 is 1 regardless of what w is.

#### koolguy

##### Active Member
OK, sir tell the diff. in Freq. & time convolution..........

#### birdman0_o

##### Active Member
Convolution in the time domain is just multiplication in the frequency domain. If you don't make any effort next time I won't answer any more.

#### koolguy

##### Active Member
A special thanks To MR AL. for the help & other member my exam of it is over so, no more discussion on it..............

The End.....................!!

#### MrAl

##### Well-Known Member
Hello again,

I hope you did well on it

#### koolguy

##### Active Member
I hope you did well on it

It was fine not so well, because my course was not completed..

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