[Scilab-users] Is FPPO available ?

[Claus Futtrup]

Hi Stefan et al.

 >What about wavelets?

Maybe wavelet toolbox? I am not so familiar with it - which wavelet 
function can do the per octave smoothing I ask for?

/Claus

On 04-Jun-14 21:17, Stefan Du Rietz wrote:
> On 2014-06-04 21:09, Claus Futtrup wrote:
> --------------------
>> Hi there
>>
>> I have generated some 60 seconds of (pink) noise, sampled at 48 kHz,
>> which I can fft to get a linear-frequency representation
>> (predominantly interested in 20 - 20k Hz).
>>
>> If I plot this data on a log-frequency plot, then of course high
>> frequency spectrum plots look very noisy.
>>
>> I need a fixed-point-per-octave (FPPO) transformation of my data so I
>> can study the spectrum better at higher frequencies with a more
>> readable trace of my frequency response data. I would be interested in
>> for example a 1/3 octave moving-average smoothing.
>>
>> In effect, the FPPO technique utilizes a measurement time window that
>> varies as a function of frequency, utilizing a long time window at low
>> frequencies (for narrow frequency resolution) and a successively
>> shorter time window at high frequencies (but averaged through the
>> entire 60 seconds).
>>
>> Is FPPO available in Scilab? (Signal Processing Toolbox maybe?) ... I
>> cannot find it.
>>
>> /Claus
>>
>> P.S. You could see this PDF file for some pictures (go to page 6,
>> Figure 4):
>> http://www.rationalacoustics.com/files/FFT_Fundamentals.pdf
>>
> What about wavelets?
>
> Stefan
>
>
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