FPGA Central

I am looking at force vs. time graphs on a project i am
working on and i have seen several of them look like this:

http://www.geocities.com/uebermenchens/1016727-AL_3.PNG
http://www.geocities.com/uebermenchens/00805HR_TN_1.PNG
http://www.geocities.com/uebermenchens/0148H10_TN_3.PNG

what i would like to do is take the data which produces
these graphs and see if there is an underlying frequency in
the data. possibly a slight oscillation that might be at a
lower force happens at a higher force. A bunch of the data
is quite smooth i have a few hundred that look like this.
Not exactly the same though. Your thoughts will be
extremely helpful!!

MT

On Jul 28, 7:59 am, "emptyc" <uebermench...@yahoo.com> wrote:
> I am looking at force vs. time graphs on a project i am
> working on and i have seen several of them look like this:
>
> http://www.geocities.com/uebermenche...48H10_TN_3.PNG
>
> what i would like to do is take the data which produces
> these graphs and see if there is an underlying frequency in
> the data. possibly a slight oscillation that might be at a
> lower force happens at a higher force. A bunch of the data
> is quite smooth i have a few hundred that look like this.
> Not exactly the same though. Your thoughts will be
> extremely helpful!!
>
> MT

Sounds like you want a spectrogram.

http://en.wikipedia.org/wiki/Spectrogram