Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

Thread Subject:
DFT vs DWT on raw data

Subject: DFT vs DWT on raw data

From: Jurgens J J Cornelius

Date: 6 May, 2013 19:28:10

Message: 1 of 3

Hallo

I hope someone can assist me with manipulation of recorded rms voltage data. The rms voltage and time in milliseconds is in Xcel format and I need to do a DFT and DWT on the sets of data. Next step will be to compare which results is more applicable for analysis purposes on an larger group of recorded data.

Thank you.

Subject: DFT vs DWT on raw data

From: TideMan

Date: 6 May, 2013 20:08:23

Message: 2 of 3

On Tuesday, May 7, 2013 7:28:10 AM UTC+12, Jurgens J J Cornelius wrote:
> Hallo
>
>
>
> I hope someone can assist me with manipulation of recorded rms voltage data. The rms voltage and time in milliseconds is in Xcel format and I need to do a DFT and DWT on the sets of data. Next step will be to compare which results is more applicable for analysis purposes on an larger group of recorded data.
>
>
>
> Thank you.

Did you read my previous post?
Which of the processes I suggested are you having trouble with?
Post the code you have developed so far, telling us where it is failing, and someone will assist you.

To answer the question about which method is better for your data, you need to do some reading.
DFT is appropriate for stationary data - if the transients in your signal are important, then DFT is no good, it will smear them out.
DWT is appropriate for non-stationary data - if the transients in your signal are not important, then use DFT.

Subject: DFT vs DWT on raw data

From: Jurgens J J Cornelius

Date: 7 May, 2013 21:07:09

Message: 3 of 3

TideMan <mulgor@gmail.com> wrote in message <ffc82c40-3948-4124-ad99-9d6acc845781@googlegroups.com>...
> On Tuesday, May 7, 2013 7:28:10 AM UTC+12, Jurgens J J Cornelius wrote:
> > Hallo
> >
> >
> >
> > I hope someone can assist me with manipulation of recorded rms voltage data. The rms voltage and time in milliseconds is in Xcel format and I need to do a DFT and DWT on the sets of data. Next step will be to compare which results is more applicable for analysis purposes on an larger group of recorded data.
> >
> >
> >
> > Thank you.
>
> Did you read my previous post?
> Which of the processes I suggested are you having trouble with?
> Post the code you have developed so far, telling us where it is failing, and someone will assist you.
>
> To answer the question about which method is better for your data, you need to do some reading.
> DFT is appropriate for stationary data - if the transients in your signal are important, then DFT is no good, it will smear them out.
> DWT is appropriate for non-stationary data - if the transients in your signal are not important, then use DFT.

Hi
I have duplicated the message by mistake. Apologies. I am working through the original response. Thank you very much for the assistance.

Tags for this Thread

What are tags?

A tag is like a keyword or category label associated with each thread. Tags make it easier for you to find threads of interest.

Anyone can tag a thread. Tags are public and visible to everyone.

Contact us