Andor <andor.bariska@[EMAIL PROTECTED]
> wrote:
> Ok, I see. I think I had a similar discussion with somebody here some
> time ago who wanted to use "pink noise" for audio testing purposes. He
> was also interested in generating series with PSD pro****tional to
> 1/(1+ K f),
> with a finite cutoff, going flat towards DC, and having the 1/f
> property for audible frequencies. Perhaps it would be a suitable
> nomenclature to call that kind (with finite cutoff frequency towards
> DC) of series "pink noise", as compared to 1/f^alpha noise.
That's true. However, as seen on the DSP generation of Pink Noise web
site[1] "pink noise" typically refers simply to noise with PSD
pro****tional to 1/f instead of 1/f^alpha. Therefore some distinction
must be made between these two. (Of course the correct way would be to
always talk about 1/f^alpha, with alpha=1 being a special case, but this
is currently uncommon.)
In any case, my code allows the limiting frequency to be made
arbitrarily low (though of course this slows down the generation a bit,
as generating a sample is O(n) for the number of poles).
[1] http://www.firstpr.com.au/dsp/pink-noise/
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