Rockbox Development > Feature Ideas
medical noise generator
nls:
I read up a little on generating pink noise etc, but you guys still haven't said *what* it is that you would want to adjust.
Running a loop that generates noise statically would be the same as playing a short pregenerated file in a loop (ignoring that the same samples repeat after a short while instead of after the RNG's cycle time, not that i think anyone can hear the difference), this could of course be integrated into a plugin but i fail to see why.
Chronon:
If the perceptual character of the noise fluctuates then it seems that the best that can be done is to mask it by burying it in a higher level of ambient noise. Cancellation would require you to have a waveform of the perceived noise so that you can adjust amplitude and phase*.
It seems to me like mixing pre-generated clips (Brownian noise, 1/f noise, white noise, etc.) would give a bit of ability to tune the perceived properties of the noise.
*: Cancellation usually relies on linear superposition of physical waves. This cannot physically happen here because one of the sounds does not correspond to a physical wave. I don't know enough about human perception of sound to comment about whether a certain spectrum of physical sound could cause perceptual cancellation or not.
Hirsch2k:
The idea of an tone/noise generator for equipment testing is nice too ;D
Ezraghast:
--- Quote from: Chronon on June 06, 2010, 03:36:01 PM ---Cancellation usually relies on linear superposition of physical waves
--- End quote ---
I would have thought cancellation relies on OPPosition of the waves so the sum is zero?
--- Quote from: Chronon on June 06, 2010, 03:36:01 PM ---If the perceptual character of the noise fluctuates then it seems that the best that can be done is to mask it by burying it in a higher level of ambient noise. Cancellation would require you to have a waveform of the perceived noise so that you can adjust amplitude and phase*.
It seems to me like mixing pre-generated clips (Brownian noise, 1/f noise, white noise, etc.) would give a bit of ability to tune the perceived properties of the noise.
--- End quote ---
I think adjustable/mixable brown/white noise clips would be great! You have hit it, spot on, when you say that "the best that can be done is to mask it by burying it in a higher level of ambient noise."
--- Quote from: Chronon on June 06, 2010, 03:36:01 PM ---I don't know enough about human perception of sound to comment about whether a certain spectrum of physical sound could cause perceptual cancellation or not.
--- End quote ---
When a tree falls in a forest....???! ;)
saratoga:
--- Quote from: Ezraghast on June 10, 2010, 12:26:08 AM ---
--- Quote from: Chronon on June 06, 2010, 03:36:01 PM ---Cancellation usually relies on linear superposition of physical waves
--- End quote ---
I would have thought cancellation relies on OPPosition of the waves so the sum is zero?
--- End quote ---
Superposition just means combining two waves.
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