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# Discussion Groups | Comp.DSP | plot 1/3 octvave frequency

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# plot 1/3 octvave frequency - zohasaba - 2012-07-12 23:37:00

```Hi everybody

I'm trying to compute plot 1/3 octave frequency of wave file . As anyone any idea about the
right algorithm?
Thanks a lot

```
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# Re: plot 1/3 octvave frequency - Mac Decman - 2012-07-13 01:54:00

```On Thu, 12 Jul 2012 22:37:34 -0500, zohasaba <z...@yahoo.com>
wrote:

>Hi everybody
>
>I'm trying to compute plot 1/3 octave frequency of wave file . As anyone any idea about the
right algorithm?
>Thanks a lot
>

If you can read MATLAB code there are a few examples in the File
Exchange.

I found this one and I have seen others.

http://www.mathworks.com/matlabcentral/fileexchange/19228-short-time-fft-with-octave-smooth

Mark DeArman
```
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# Re: plot 1/3 octvave frequency - Andreas Huennebeck - 2012-07-13 02:36:00

```zohasaba wrote:

> I'm trying to compute plot 1/3 octave frequency of wave file . As anyone
> any idea about the right algorithm?

- do a fourier transform and store the result in an spectrum array
- create an array of 1/3 octave values
- fill this array from the spectrum array data:
- sum up all values in the spectrum array whose frequency belongs into
one specific octave value point.
- Put this sum into the octave value array.
- repeat this for all octave value points

bye
Andreas
--
Andreas Hünnebeck | email: a...@gmx.de
----- privat ---- | www  : http://www.huennebeck-online.de
Fax/Anrufbeantworter: 0721/151-284301
GPG-Key: http://www.huennebeck-online.de/public_keys/andreas.asc
PGP-Key: http://www.huennebeck-online.de/public_keys/pgp_andreas.asc

```
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# Re: plot 1/3 octvave frequency - dbd - 2012-07-13 03:05:00

```On Thursday, July 12, 2012 8:37:34 PM UTC-7, zohasaba wrote:
> Hi everybody
>
> I&#39;m trying to compute plot 1/3 octave frequency of wave file . As anyone any idea