http://nm-archives.electro-music.com/010_NordModular/ 014_Interesting_Threads/Folder/ModularAsMotionSensor/ ModularAsMotionSensor.htm
here i found it ... maybe it can be helpful for you luigi Am 07.08.2008 um 22:57 schrieb Luigi Rensinghoff: > Thats very cool... > > i heard of someone implementing that with a nord-modular.... > > If you browse the forums maybe you can find it... > > Its a cool thing to have for Sound-Installations... > > Best > > Luigi > > Am 07.08.2008 um 21:16 schrieb Ico Doornekamp: > >> >> Hi all, >> >> Yesterday I found out that modern audio cards can do much higher >> sample >> rates then 48000, which allows for entertaining experiments with >> ultrasound. >> >> I'm not sure if this has been done before, but I'm pretty happy >> with the >> results so far. >> >> I've created a patch running on a samplerate of 88200 Hz, which sends >> out high-frequency chirps over two laptop speakers. The chirps are >> reflected back to the bultin mic using both hands. The reflection is >> correlated with the outgoing chirps to calculate the time the sound >> waves needed to return to the mic, thus measuring the distance to the >> hands or any objects hovering above the laptop. >> >> This particular patch just drives two tone generators whose >> frequencies >> depend on the measured distances, which are played back over the same >> speakers as the high-frequency chirps. The result is a >> two-tone-polyphonic theremin-like instrument. >> >> If only I could play this thing in tune... >> >> A simple demonstration video and the patch can be found at >> >> http://zevv.nl/play/code/ultrasonic-theremin/ >> >> This patch just a first test using ultrasound, I'm sure much more >> interesting things can be done using this technique. >> >> The patch is not very well documented at this time, and I think >> getting >> things to work needs a fair amount of tweaking for each different >> setup. >> Things that need to be setup properly are output level of the >> soundcard, >> a magic gain factor after the correlation, and the range that >> should be >> inspected for echo peaks to avoid detecing of reflections from the >> ceiling. I think it would be possible to make the patch do some >> auto-detection of some of the paremeters like ceiling height and gain >> factors, which would make a nice addition for future versions. >> >> Enjoy, >> >> Ico >> >> -- >> :wq >> ^X^Cy^K^X^C^C^C^C >> >> _______________________________________________ >> [email protected] mailing list >> UNSUBSCRIBE and account-management -> http://lists.puredata.info/ >> listinfo/pd-list >> > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/ > listinfo/pd-list > _______________________________________________ [email protected] mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
