That’s something easy to prove even in the general case and if I do that I will be an obstacle between you and learning. Put your own effort in and don’t depend on others. You will do much better in life.

There are 1 million books but you can just google it and get free info. The inverse and the direct FT are the same except for a constant. I would start with Wikipedia and then continue with Google. Search for exercises too.

It didn’t get approval, unfortunately. Would you mind explaining Inverse Fourier Transform in details ? or do you have any good sources for explaining Inverse Fourier Transform.

I think this assignment is to create a fairly simple calculator that can demonstrate with various time steps and frequency steps to compare accuracy of the function itself. The example from class is using random number generator instead of any real data from real life.

I have also downloaded your model and understand as much as I could but I think your model is beyond my assignment requirements. Deadlines are soon. I also found some useful videos from youtube. They used DFT and IDFT from excel.

if you were me what would you do to build a fairly simple calculator to demonstrate the time step and frequency steps ?

Kelvin,
The purpose of the class and the assignment is for you to do the research.
You can use Excel but the solution will be (sampled) which is approximate. I’m pretty sure that’s what they ask anyway.
My model is only for real functions, for the general complex case you need to develp the model further.
Use he formulas in the course and the model I built as an example to create a complex Fourier calculator. This might take you a few days or even a week. Don’t procrastinate. When is the final deadline?

George, thank you for getting back this quick. I actually having an assignment about inverse FT and I have no idea how to do this assignment.
If you don’t mind, can you please tell me what are the technique I need to use for the assignment requirements below. I believe I can do it with Excel.

Thanks.

Part A – Application of the Inverse Fourier transform
Using inverse Fourier transform techniques, build a calculator that can do the following:
Rebuild a signal once the Fourier transform is found
Demonstrate the effects of resolution of time, and frequency on the accuracy of the rebuilt signal

You might not read this in time since this excel is already 1 year old. I am sure you would know Inverse Fourier Transform as well.. Do you have a tutorial for Inverse Fourier Transform ? And one more thing, would you mind explain what is the different between Fourier Transform, Fast Fourier Transform , Discrete Fourier Transform and Inverse Fourier Transform.

I am very new to this topic so I have very minimum knowledge about them.

Kelvin, I have centralized comment control so I can see all the new comments on all the posts.

I’ve been slacking with the blog since we are fire evacuees right now.
I need to re update myself with the FT since it’s been more than two decades since I’ve studied this in school but to be brief the inverse FT uses the same formula as the FT and the difference is just a constant. In real life we only use the DFT since the normal (continuous FT) is calculated on an infinite number of points and on an infinite time (or space) domain, In DFT everything is finite and you only sample a small (perhaps thousands or so) of time and frequency points. FFT is DFT with a twist and it is designed for math processors to use minimum ammount of hardware/calculation time.

George,

do you mind showing me one example of fourier transfrom then inverse fourier transform to it’s original state?

I can’t quite understand how the constant of 1/2pi recover the fourier transform into its original state.

Kelvin,

That’s something easy to prove even in the general case and if I do that I will be an obstacle between you and learning. Put your own effort in and don’t depend on others. You will do much better in life.

There are 1 million books but you can just google it and get free info. The inverse and the direct FT are the same except for a constant. I would start with Wikipedia and then continue with Google. Search for exercises too.

Try it out but make sure it’s approved by your instructor.

George,

It didn’t get approval, unfortunately. Would you mind explaining Inverse Fourier Transform in details ? or do you have any good sources for explaining Inverse Fourier Transform.

thanks

George,

I find out I can actually use IDFT and DFT function in Excel. I would just use that function.

Hi George,

I think this assignment is to create a fairly simple calculator that can demonstrate with various time steps and frequency steps to compare accuracy of the function itself. The example from class is using random number generator instead of any real data from real life.

I have also downloaded your model and understand as much as I could but I think your model is beyond my assignment requirements. Deadlines are soon. I also found some useful videos from youtube. They used DFT and IDFT from excel.

if you were me what would you do to build a fairly simple calculator to demonstrate the time step and frequency steps ?

Kelvin, I would use a built in Excel function if it were available but make sure to check with your pals in the class and see what they do first.

Kelvin,

The purpose of the class and the assignment is for you to do the research.

You can use Excel but the solution will be (sampled) which is approximate. I’m pretty sure that’s what they ask anyway.

My model is only for real functions, for the general complex case you need to develp the model further.

Use he formulas in the course and the model I built as an example to create a complex Fourier calculator. This might take you a few days or even a week. Don’t procrastinate. When is the final deadline?

George, thank you for getting back this quick. I actually having an assignment about inverse FT and I have no idea how to do this assignment.

If you don’t mind, can you please tell me what are the technique I need to use for the assignment requirements below. I believe I can do it with Excel.

Thanks.

Part A – Application of the Inverse Fourier transform

Using inverse Fourier transform techniques, build a calculator that can do the following:

Rebuild a signal once the Fourier transform is found

Demonstrate the effects of resolution of time, and frequency on the accuracy of the rebuilt signal

Hi George,

You might not read this in time since this excel is already 1 year old. I am sure you would know Inverse Fourier Transform as well.. Do you have a tutorial for Inverse Fourier Transform ? And one more thing, would you mind explain what is the different between Fourier Transform, Fast Fourier Transform , Discrete Fourier Transform and Inverse Fourier Transform.

I am very new to this topic so I have very minimum knowledge about them.

Thank you in advance.

Kelvin, I have centralized comment control so I can see all the new comments on all the posts.

I’ve been slacking with the blog since we are fire evacuees right now.

I need to re update myself with the FT since it’s been more than two decades since I’ve studied this in school but to be brief the inverse FT uses the same formula as the FT and the difference is just a constant. In real life we only use the DFT since the normal (continuous FT) is calculated on an infinite number of points and on an infinite time (or space) domain, In DFT everything is finite and you only sample a small (perhaps thousands or so) of time and frequency points. FFT is DFT with a twist and it is designed for math processors to use minimum ammount of hardware/calculation time.

Just click the green “Excel Download” button above. It works for me.

Where’s the Fourier analysis in excel download? It looks great!