poctave.m errors gives wrong results

Use poctave to get a nice 1/3 octave plot

>>>poctave(xalt,Fs,opts{:}) Levels are displayed

then: >>>[pxx,fxx]=poctave(xalt,Fs,opts{:})

pxx gives completely different numbers to those displayed in the plot ????

fxx gives the right results

[Rik]

Can you give a small example how we can generate the data needed to reproduce your problem?

[Maureen Resler]

After writing the comment yesterday and trying to find a solution the following is the case:

poctave(xalt,Fs,opts{:}) The 1/3 octave levels (in my case) are displayed against frequencies

Now in the case of:

[pxx,fxx]=poctave(xalt,Fs,opts{:})

To get the 1/3 octave levels as in the plot:

the following: Level=log10(pxx) * 10.0

The description in the help file needs to be improved.

Hopefully an example for sound pressure levels taking a time domain signal (Wave file) and processing to 1/3 octave bands would be helpful. Also the pRef level needs to be defined. Its not always 20e-6.....

[Rik]

I don't have access to the toolbox that contains this function, so you will have to write a complete example that reproduces your issue. We should be able to copy and paste your code to our copy of Matlab and see the issue. That way we might be able to help you.

Also, please have a look at the preview window when you post a question or comment. Making your comments easy to read improves your chances on someone helping you.

[Maureen Resler]

Thank you by the way for your very prompt replies. I hesitated to send the code because you'd need to read a wave file, in my implementation, to see the results. I'll see what I can do during the course of the day with a generated time signal.....