Hi Andy,
Andy Farnell wrote:
JFYI the application is rainfall. Many papers I read describe rainfall as Gaussian.
maybe mine is a simplistic approach, but shouldn't this be one of the cases in which measuring the spectrum of true rainfall sounds and trying to emulate it with one of spectrum matching techniques provides a good approach?
I know from physical analysis that raindrops are uniform
in size
and velocity for any local sample, so I've realised this
distribution
is about how they fall within an area and pondering how a distribution can be Gaussian in 2D.
Do they take into account the fact that near drops have high frequency content which far ones have high frequency attenuation (and they sum together)? Just thinking...
Which references do you have about this issue?
Several months ago I wrote a patch for the generation of colored noise, maybe it can be helful here... https://puredata.info/Members/AlbertoZ/ColoredNoise/
AlbertoZ
http://puredata.org/Members/AlbertoZ http://alberto.zin.googlepages.com/
Hey Alberto,
Thanks for the ideas. What this bit is for.. its not the noisy background you get to rain, 1/x noise (everyone loves that sound, sometimes called "comfort noise"), but I'm looking at the effect of very light rain when it's on your window and you can hear every individual drop. Apart from the soft pressure signature something else tells you it's rain within a few seconds, and that's the distribution
For analysis of the droplet signature
"COMPUTATIONAL REAL-TIME SOUND SYNTHESIS OF RAIN" by Stanley J. Miklavcic, Andreas Zita and Per Arvidsson
Those guys go straight for a cheeky physical model via the wave equation. Outrageous overkill, but great to know.
Many papers from environmental scientists on spectra, because listening to the spectra and intensity underwater we can measure rainfall out at sea (to predict storms, as well as using RADAR and satelites). So I collect stuff like this too
"Intercomparison of ambient acoustic spectra in inland and coastal waters" (Quartly, Shannon, Guymer, Birch Campbell)
What would be nice are other studies of rain sound done from different perspectives (artistic, musical, etc)
good wishes,
Andy
On Mon, 17 Mar 2008 12:24:44 +0100 "alberto.zin@poste.it" alberto.zin@poste.it wrote:
Hi Andy,
Andy Farnell wrote:
JFYI the application is rainfall. Many papers I read describe rainfall as Gaussian.
maybe mine is a simplistic approach, but shouldn't this be one of the cases in which measuring the spectrum of true rainfall sounds and trying to emulate it with one of spectrum matching techniques provides a good approach?
I know from physical analysis that raindrops are uniform
in size
and velocity for any local sample, so I've realised this
distribution
is about how they fall within an area and pondering how a distribution can be Gaussian in 2D.
Do they take into account the fact that near drops have high frequency content which far ones have high frequency attenuation (and they sum together)? Just thinking...
Which references do you have about this issue?
Several months ago I wrote a patch for the generation of colored noise, maybe it can be helful here... https://puredata.info/Members/AlbertoZ/ColoredNoise/
AlbertoZ
http://puredata.org/Members/AlbertoZ http://alberto.zin.googlepages.com/
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Andy Farnell