Links
- Dave Krooshof
- Ernst van der Loo
- Aslaug Holgersen
- Thijs Scheele
- Juan Parra
- Leon Spek
p2p weblog
our weblog about filesharing
and legal issues concerning
the publishing of music.
home:
www.dendriet.nl- linkpage
new subject
Archives
Dendriet is a network of musicians in The Hague (.nl) that perform with networked electronic and acoustic instruments. The word dendriet, or dendrite, is also the name for the receptors of a nervecell. Dendrites are typically branching branches. You'll find these fractal shapes in ice, in metal chrystals in limestone, and likewise, in our performance setups. Please do check out our homepage by clicking the stone. You too are invited to join the discussions.
16.3.04
Of the Noise anda Whine
There is a concept that is called anti-sound. The idea is to produce the exact opposite airpressure of the sound source that you do not want to hear. There are two problems with it that are hard to solve by definition. The first is that your anti-sound speaker can't be in the exact same position as your original soundsource. And since soundwaves travel fairly slowly through the air, this means that cancellation only works in specific angles from the two (anti)sound sources to the listener.
The other, in this case more interesting one, is that you need to predict the noise you want to cancel. This is easy if you want to predict something tonal. You can safely bet what the next move of a periodic sound is, based on it's repetative behaviour in the past.
But with noise, it's different. You could define the next moment in a dark coloured noise source as "a bit different from what you'd expect". In a white noise source, this would simply be "most likely something completely different from what you would expect" or "other" (although it illegally suggests that the predicting matters).
It's hard to cancel out something that has "forgetfullness" as it's main quality.
The other, in this case more interesting one, is that you need to predict the noise you want to cancel. This is easy if you want to predict something tonal. You can safely bet what the next move of a periodic sound is, based on it's repetative behaviour in the past.
But with noise, it's different. You could define the next moment in a dark coloured noise source as "a bit different from what you'd expect". In a white noise source, this would simply be "most likely something completely different from what you would expect" or "other" (although it illegally suggests that the predicting matters).
It's hard to cancel out something that has "forgetfullness" as it's main quality.
