Pd-list February 2007

pd-list@lists.iem.at

148 participants
295 discussions

measuring distance between speaker and microphon
by Roman Haefeli 14 Feb '07

14 Feb '07

hi all i'd like to create a patch, that measures the distance between the speaker and the microphone. my first problem is, that i don't know which kind of signal would be suitable for that purpose. the simplest is to use a dirac impulse. but on the receiver-side it's hard to separate unwanted artefacts from the impulse itself. also it would be nice, if it would be possible to detect the signal reliably at different amplitudes, since the amplitude heavily changes when moving the mic closer to and farer from the speaker. i am looking for a method, that allows higher precision than the usual block-size (which introduces a grid of ~0.5m @ 44100Hz, which is not very accurate). also should it be possible to detect the signal correctly, when there was reverberation added from a room. i know, there are ultrasonic-bases devices to measure a distance to a wall, but i don't have clue how they work, but it makes me hope, that something similar is possible with pd. any hints are much appreciated. roman ___________________________________________________________ Der frühe Vogel fängt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail: http://mail.yahoo.de

2 2

Fwd: [PD] measuring distance between speaker and microphon
by Miikka Tikander 14 Feb '07

14 Feb '07

Hi, I made some externals for binaural acoustic positioning for my work some time ago and it also included some externals for acoustic distance measurements. I was supposed to polish them up to be published on my website but I never got that far... Anyway, here's one simple patch with one of the distance measurement externals. The external is an OSX version but I know I have a linux version somewhere as well. If needed I can try to find it and send it as well, or maybe I'll send the source so people can compile it themselves if interested. It should be compilable WIN and Linux as well. As there's no documentation in the patch, here's a brief documentation for the patch and the external. The DIST_HP~ external sends high-passed (> 17 kHz) impulses from the loudspeaker and then measures the fly-time of these impulses to two microphones (here input channels 1 and 2). The slider on the upper right hand corner (Impuse interval) sets the time interval (in 64 sample blocks) of the impulses, that is, how often the distance is measured. The last two outlets of the DIST_HP gives out the distance of the microphones to the loudspeaker in meters. I put a mean and a median filter on there as well to smooth the data but you may use whatever is appropriate. The distance is computed in sample accuracy. The 'free_distance_in_meters' -outlet transforms the impulse time interval to a physical distance. This, in principal, should be greater than the longest microphone-loudspeaker distance you will use. The calibration is done by using the calibration_latency -number on the left. Place a microphone to a known distance from the loudspeaker and then tune the calibration_latency so that the measured distance is correct. Increasing the latency increases the measured distance. The measured distance cycles from 0 to the free_distance_in_meters. So, when increase the calibration_latency and the measured distance reaches the free_distance_in_meters it will go back to zero and continue from there. The volume slider sets the output volume of the impulses. Note, that the impulses are high passed above 17 kHz so actually not everybody will here them! Be cautious with the volume. The whole idea of using higher frequency range was to make the impulses inaudible, and to avoid interference from room reflection and from other sounds as well. I have a version which uses full band impulses as well, but then the reflections start to worsen things.. You must use 44,1 kHz sampling frequency. Hope, it works and is usable. Once I get little extra time, I'll try to get the rest of the stuff organized and documented so I can publish them here as well. Any feedback or criticism is always welcome. -miikka

1 0

Sampler loop strategies
by dafydd hughes 14 Feb '07

14 Feb '07

Hi folks I'm trying to build your classic sample player, with multiple key zones etc, but I'm getting kinda stuck with looping. Any thoughts on how I might gracefully implement a player which plays a sample from the beginning when triggered, but then only loops a section, like my hardware sampler does? The best solution I can think of is to use 2 tabread4~'s: one controlled by a line~ for the initial pass, and the other with phasor~ for the loop, then crossfade them. Anybody have a better idea? I know I could just use a softsynth for this, but in a beautiful reversal, in this case it's actually easier to use pd. Take that, propellerhead. cheers dafydd -- www.sideshowmedia.ca skype: chickeninthegrass

1 0

RE: [PD] slicing samples
by Roman Haefeli 14 Feb '07

14 Feb '07

On Tue, 2007-02-13 at 17:58 +0000, jared wrote: > I followed the link but I can't seem to find anywhere to download. > Actually (really stupid question alert) how do I download from the > archives? It seems when I click download on any of the files, it just > brings up a page with code. Any help? > whenever you see pd-code, you can just copy the code to some texteditor and save it with the .pd-extension. pd-files are nothing more than common text-based files, you can edit with any texteditor. roman ___________________________________________________________ Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de

6 7

measuring time between audio events (clicks)
by Roman Haefeli 14 Feb '07

14 Feb '07

hi all i've got a problem, that i don't know how to solve (which is common, when writing to the list ;-). i'd like to measure the delay time between an original signal (could be a dirac or some kind of pling [with a defined frequency]) and the same, but delayed signal, e.g the signal after [delwrite~]/[delread~]. how can this be achieved? since the output should be a time-value in the 'message-domain', i won't come around to convert audio to messages. in order to make the grid of the meaurements smaller than 1.45msec, i tried to reblock the subpatch containing [env~]. my problem is, that it seems that i cannot measure more often than all 1.45msec. also when i measure the time between each 'bang' outputted by [bang~], the smallest value i can get is 1.45msec, even if i have a [block~ {x<64}] in the same subpatch. why is this? while writing this, i had the idea of converting audio-blocks to lists of floats using [pack~] from zexy. with this approach i don't have to reblock at all, since i can detect the peak in the 'message-domain' without losing the info, when exactly the peak happened. anyway, my question about [bang~] in a subpatch reblocked to a value<64 stays actual. ciao roman ___________________________________________________________ Telefonate ohne weitere Kosten vom PC zum PC: http://messenger.yahoo.de

2 2

output grayscale value of pixels in a video
by pablo das neves bicho 14 Feb '07

14 Feb '07

Hi list, I'd like to know if there is an object or an abstration to output the grayscale values of each pixel of a low resolution video, in order to use those value to control the behaviour of 3d objects. Should i use gridflow ? Any ideas/hints would be welcome. cheers pablo ___________________________________________________________________________ Yahoo! Mail rÃ©invente le mail ! DÃ©couvrez le nouveau Yahoo! Mail et son interface rÃ©volutionnaire. http://fr.mail.yahoo.com

12 16

image from ggee and gop
by guillaume rabusseau 14 Feb '07

14 Feb '07

Hi all, Is there a way to see the image displayed by the image external from ggee on a graph on parent patch? I'v looked for a previous post in the list but did'nt find... THx Cheers Guillaume Rabusseau _________________________________________________________________ Avec Windows Live OneCare Ã©liminez tous les virus de votre PC ! http://www.windowslive.fr/liveonecare/default.asp

1 0

Toxy Widget img and relative paths
by guillaume rabusseau 14 Feb '07

14 Feb '07

Hi all, I use widget to display an image. I use Pd 0.39.2 on Windoz Xp. I have a little problem : i cannot specify a relative path to the image, i must use [widget img img__a #src c:/Projets/aks/abs/a.gif] and i would like to use something like [widget img img__a #src ./a.gif] I've joined the img.wid file i use. I've found it in the demo_img.pd file. Another question : Does someone have or know where i could find a dll of the image external. Thanks Cheers Guillaume Rabusseau _________________________________________________________________ Avec Windows Live OneCare Ã©liminez tous les virus de votre PC ! http://www.windowslive.fr/liveonecare/default.asp

2 2

Instrument Design Survey
by Matthew Paradis 14 Feb '07

14 Feb '07

Apologies for cross postings Dear All, I am currently carrying out research for a PhD in Music Technology. As part of this research I am trying to get a general idea of the current trends in the design of interactive performance systems and New Musical Instruments. I would greatly appreciate it if you could spend a couple of minutes answering the survey at the link below. http://www.my3q.com/home2/144/mdjp100/54558.phtml Regards Matthew Paradis

4 4

Re: [PD] installing linux
by carmen 14 Feb '07

14 Feb '07

On Wed Feb 14, 2007 at 03:55:57AM -0000, jared wrote: > Hello list, > > I want to install linux on an old laptop. What distro do you guys use? > Which distro is most stable for PD work? Are some distros more suited > for audio apps? gentoo with the proaudio overlay is great. if you have an aversion to having your computer compile things for you, you could try one of the msusic-specific dsitrii lke ubuntu-studio/demudi/planetccrma/musix/studio64/studiotogo/puredyne > > At the moment, I don't know the specs for the laptop.....are there > recommended minimum system specs to successfully operate linux running > PD? 150 mhz is probably too low > > Thanks all, > > Jared > > > _______________________________________________ > PD-list(a)iem.at mailing list > UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list >

1 0

← Newer
1
...
13
14
15
16
17
18
19
...
30
Older →

Jump to page:

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

Pd-list February 2007