Re: [PD] Purpose of sig~
On 2010-11-03 23:42, Jonathan Wilkes wrote: Is this because signal inlets of signal objects (except for the leftmost) don't accept one-element lists? If so I think it'd be a cheaper workaround putting a [t f] before those inlets. or upgrade to Pd-0.43, where there is an implicit conversion between 1-element-lists and floats/symbols, as well as zero-element-lists and bangs. fgmasdr IOhannes smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Purpose of sig~
On 2010-11-03 15:46, Jamie Bullock wrote: Hi all, This is more of philosophical question than anything else. I'm curious to know why [sig~] hasn't been designed out of Pd. Why not have implicit control - signal conversion everywhere it is possible? For example why not allow this? |2( |3( | | [+~ ] i don't think i understand your question. the above is totally legal on the versions of Pd i have installed on this machine. otoh, [sig~] has been there for ages and longer. some old patches might still use it, because _then_ you had to explicitely convert to signals. should [sig~] be removed and break these patches? and while i do use implicit float/signal conversion in my patches, i think explicit conversion is not that bad either: it may prevent people from hooking a slider into a [*~] and then complain why they get glitches. fgmasdr IOhannes smime.p7s Description: S/MIME Cryptographic Signature ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Phase and impulse response measurement
Hi everyone, i wondered if someone made a patch measuring the PHASE of a reference signal compared to measured signal and also if someone made a patch measuring the IMPULSE RESPONSE of a reference signal compared to measured signal greetz Ck ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Phase and impulse response measurement
For impulse response there is this: http://cnx.org/content/col10519/latest/ Not fully explored this yet but it has been on my todo-list for too long... Cheers, Jb On 4 November 2010 10:34, Christoph Kuhr christoph.k...@web.de wrote: Hi everyone, i wondered if someone made a patch measuring the PHASE of a reference signal compared to measured signal and also if someone made a patch measuring the IMPULSE RESPONSE of a reference signal compared to measured signal greetz Ck ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Purpose of sig~
On 4 Nov 2010, at 09:50, IOhannes m zmoelnig wrote: On 2010-11-03 15:46, Jamie Bullock wrote: Hi all, This is more of philosophical question than anything else. I'm curious to know why [sig~] hasn't been designed out of Pd. Why not have implicit control - signal conversion everywhere it is possible? For example why not allow this? |2( |3( || [+~ ] i don't think i understand your question. Well retrospectively, the question doesn't make any sense at all because it's based on a test I did with a (subsequently discovered) broken bang~. See bug https://sourceforge.net/tracker/?func=detailaid=3102828group_id=55736atid=478070 So I thought that implicit conversions weren't working, when in fact bang~ wasn't triggering my snapshot~. Jamie the above is totally legal on the versions of Pd i have installed on this machine. otoh, [sig~] has been there for ages and longer. some old patches might still use it, because _then_ you had to explicitely convert to signals. should [sig~] be removed and break these patches? and while i do use implicit float/signal conversion in my patches, i think explicit conversion is not that bad either: it may prevent people from hooking a slider into a [*~] and then complain why they get glitches. fgmasdr IOhannes ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Phase and impulse response measurement
Hi, On Thu, Nov 04, 2010 at 11:34:27AM +0100, Christoph Kuhr wrote: i wondered if someone made a patch measuring the PHASE of a reference signal compared to measured signal and also if someone made a patch measuring the IMPULSE RESPONSE of a reference signal compared to measured signal I'm not sure what you mean by IR or phase of a signal, usually it's some kind of transformation system like a filter, whose IR or PR people are interested in. Anyway for measuring filter phase and frequency responses, the filter-graph abstractions in the Pd docs can be useful. Check out for example H10.measurement.pd and replace the [bp~] with whatever you would like to measure. It's using a swept-sine method. Pure Measurement is a complete toolkit written in Pd for these kinds of things: http://www.hoertechnik-audiologie.de/downloads/PureMeasurement/ Ciao -- Frank BarknechtDo You RjDj.me? _ __footils.org__ ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Phase and impulse response measurement
Hi everyone, i wondered if someone made a patch measuring the PHASE of a reference signal compared to measured signal Hi, you could one of the cross-correlation externals to measure the time delay between 2 signals. (there's one external in iem_tab from pd-extended I remember and there are possibly more). If that's useful for you I created a similar, fft based patch using vanilla objects I can post here. However correlation doesn't directly measure phase differences of separate frequency bands but the delay of the signal over all frequencies. Martin ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Shifter~ Object for Linux?
On 3 Nov 2010, at 12:05, Derek Holzer wrote: [plugin~] works fine when given the proper creation arguments. That said, the creation arguments in the official help file may not be the correct ones for you! There was a few threads, one in the last year, about getting [plugin~] to work. You might check those. The best way to have LADSPA plugins in Pd is to use [dssi~]. Does everything plugin~ can do and more. Jamie ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Phase and impulse response measurement
On Thu, 4 Nov 2010, Martin Schied wrote: Hi everyone, i wondered if someone made a patch measuring the PHASE of a reference signal compared to measured signal you could one of the cross-correlation externals to measure the time delay between 2 signals. (there's one external in iem_tab from pd-extended I remember and there are possibly more). If that's useful for you I created a similar, fft based patch using vanilla objects I can post here. However correlation doesn't directly measure phase differences of separate frequency bands but the delay of the signal over all frequencies. What do you mean ? If you get the imaginary part of the logarithm of the cross correlation, it gives you a list of phase differences corresponding to each frequency bin, right ? (that's equal to the atan2 between the real and imaginary parts of the cross-correlation) ___ | Mathieu Bouchard -- Villeray, Montréal, QC___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Fedora build of Pd-extended 0.42.5?
I 've read on Hans' website that Planet CCRMA needs a build of the latest Pd-extended. I have Fedora 12 on my laptop and I'm beginning to realize that it'd be actually cool to have an updated version of Pd to play with. I'd be glad to help, if : 1- this isn't too complicated, because my knowledge is extremely limited (I've read the page on Pd.info about building pd, if it's only a matter of downloading all the devel tools and typing Make in a terminal it's cool) 2- this won't take too long (cause i have quite a lot of work to do right now). Pierre It requires a little more than ./configure, make, make install but I was able to build 42.4 on fedora 13 and updated the Fedora page on the PD Community Site: http://puredata.info/docs/developer/Fedora You may want to install to a separate directory to keep your older version. If you find any mistakes in the page above, please correct it for others who follow. -- Jeff Sandys ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Phase and impulse response measurement
On Thu, 4 Nov 2010, Christoph Kuhr wrote: i want to display it like the picture attached... What does it change to what I just said ? We are talking about the same thing. ___ | Mathieu Bouchard -- Villeray, Montréal, QC___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Musical notation object on Pd
Oi Caio, someone posted a new object in development in the pd-dev list last month. This can be quite good, and if I remember correctly, it allows musicxml, and works on all platforms - http://lists.puredata.info/pipermail/pd-dev/2010-10/016136.html. I guess anyone with the knowledge can adapt pwgl displays to pd, but it might also pay up to help the project I mentioned. João Pais Hello guys. I've been dreaming about an object that would display musical notation and output data (like midi numbers for instance). I found a discutions about something like that here in our list ( http://www.mail-archive.com/pd-list@iem.at/msg19969.html) but this was a discussion about creating live musical notation for performance, and what I have in mind is something more like a Computer Assisted Composition/Research tool. If i'm not mistaken Open Music and PWGL (http://www2.siba.fi/PWGL/) already have something like this. Look at the images I made of how this object would look like: - The input would be a message with the midi number of the pitch, and the object would display a Treble or Bass cleff with the note and output the number of the pitch through the outlet (cleff_pd_01.png). - It would be possible to alterate the pitch by holding and dragging the mouse (cleff_pd_02.png) - Chords could be made... (cleff_pd_03.png) - or melodies... (cleff_pd_04.png) - or even sequences of chords. (cleff_pd_05.png) The output could easily be transformed into notation for lilypond, for instance (like Collin Oldham did in that thread I mentioned). Do you think it's possible to do something like that? At the moment I don't have the money to pay a programmer to do that (I would happily do it if I could). Maybe I can learn how to do this, but I don't know where to start. I already see some complications to build this object: - it would have to stretch itself so the chords and melodies would fit; - It would have to decide what cleff to use (or maybe not, the user could send a message like [treble); - There should have a way to choose between flat and sharp; - A nice thing would be to have more than one staff at once, like a piano staff for instance, and so on... For now I'm just wondering if something like this could be done. I've been doing some calculations of composition techniques using Pd and I miss musical notation so much. Bye! Caio Barros Bonus: I made an abstraction to transform midi note to pitch name and also frequency as a part of a bunch of composition tools I use. (and after I read those threads about creating the notation object in GEM I discovered that some people already did it, but here it go anyway). see midi_note.pd -- Friedenstr. 58 10249 Berlin (Deutschland) Tel +49 30 42020091 | Mob +49 162 6843570 Studio +49 30 69509190 jmmmp...@googlemail.com | skype: jmmmpjmmmp ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Musical notation object on Pd
Marcus Bittencourt did some work in this direction: http://www.rem.ufpr.br/_REM/REMv11/13/13-bittencourt-puredata.html ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Musical notation object on Pd
This is an interesting topic... but just to give you another direction/point of view, as I'm not sure exactly what your final aim is. You can hook up any jack-aware program that does notation to Pd via midi (for e.g. Rosegarden or even MuseScore) this, can be both ways (Pd could send midi data to these programs, for example to do the algorithmic assisted composition stuff). Not sure if anything of this makes sense to you. Lorenzo Caio Barros wrote: Hello guys. I've been dreaming about an object that would display musical notation and output data (like midi numbers for instance). I found a discutions about something like that here in our list (http://www.mail-archive.com/pd-list@iem.at/msg19969.html) but this was a discussion about creating live musical notation for performance, and what I have in mind is something more like a Computer Assisted CompoResearch tool. If i'm not mistaken Open Music and PWGL (http://www2.siba.fi/PWGL/) already have something like this. Look at the images I made of how this object would look like: - The input would be a message with the midi number of the pitch, and the object would display a Treble or Bass cleff with the note and output the number of the pitch through the outlet (cleff_pd_01.png). - It would be possible to alterate the pitch by holding and dragging the mouse (cleff_pd_02.png) - Chords could be made... (cleff_pd_03.png) - or melodies... (cleff_pd_04.png) - or even sequences of chords. (cleff_pd_05.png) The output could easily be transformed into notation for lilypond, for instance (like Collin Oldham did in that thread I mentioned). Do you think it's possible to do something like that? At the moment I don't have the money to pay a programmer to do that (I would happily do it if I could). Maybe I can learn how to do this, but I don't know where to start. I already see some complications to build this object: - it would have to stretch itself so the chords and melodies would fit; - It would have to decide what cleff to use (or maybe not, the user could send a message like [treble); - There should have a way to choose between flat and sharp; - A nice thing would be to have more than one staff at once, like a piano staff for instance, and so on... For now I'm just wondering if something like this could be done. I've been doing some calculations of composition techniques using Pd and I miss musical notation so much. Bye! Caio Barros Bonus: I made an abstraction to transform midi note to pitch name and also frequency as a part of a bunch of composition tools I use. (and after I read those threads about creating the notation object in GEM I discovered that some people already did it, but here it go anyway). see midi_note.pd ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] [PD-announce] Pd-berlin meeting next tuesday, 9th November, 20h00 - Felix Pfeifer, selfmade USB-MIDI interface
Hello, next tuesday, 21st September, will be the next meeting of Pure Data users in Berlin at NK (http://www.nkprojekt.de/) - Elsenstr. 52, 2HH 2Etage. Felix Pfeifer will present his work (in progress). His project aims at providing an interface for creating improvized pattern based (dance-) music live in realtime (without loading or saving). He uses the novation launchpad and a selfmade USB-MIDI interface with many knobs and sliders custom-designed for a pd patch hosting the synths LINK Topics: - using the launchpad with Linux - programming the launchpad LEDs in pd - general discussion on (self-made) interfaces - mappings in pd For more information, look up http://puredata.info/community/organization/pd-berlin/pd-berlin-users-group. We also encourage you to take an active part, and put up suggestions for topics you want to talk about / topics you want to be talked about. Please, don´t call to the staff of NK to open the doors. They let us use the space but we have to take care about having the meeting without producing any disturbance to them, and to clean the space after the meeting. We would apreciate if you would send us a small mail to info_at_minitronics.net with your name, Pd experience and interests, so that we know how many people might be coming. Or put your name in the pd-berlin wiki page. We would like to thank the support and willingness of NK in the organization of these events. João Pais -- Friedenstr. 58 10249 Berlin (Deutschland) Tel +49 30 42020091 | Mob +49 162 6843570 Studio +49 30 69509190 jmmmp...@googlemail.com | skype: jmmmpjmmmp ___ Pd-announce mailing list pd-annou...@iem.at http://lists.puredata.info/listinfo/pd-announce ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Musical notation object on Pd
João: what you are saing sounds good, but in that discussion I could hardly see how that object works. Bernardo: That looks awesome and is almost in the same direction I had in mind (I was definetly thinking in CAC programms) too bad article doesn't have a download link, I wonder if that program can output data besides taking it and transforming into notation. Lorenzo: that makes sense but I don't know how to do it, this can be of great great help but I still think that an object inside Pd would be much more confortable. Like Marcus Bittencourt say in the article, the idea would be to incorporate some CAC tools into Pd and ultimately make a free, open-source tool for both things. I could make those calculations i'm doing using another program (at the end it's all just numbers) but, first, the program I know best is Pd, and second, I like to use a tool made for music to do musical calculations. In my oppining the thing is that this kind of interface is much more human friendly (at least musicianship friendly) and makes the interaction more fun and visualization of the problems easier. Just to put it in a context, what i'm doing right now is buiding a patch to calculate the harmonic nets (or harmonic networks, I don't know what is the best translation), a composition technique created by the belgian composer Henri Pousseur. At the moment this patch is too much crude for me to share it, besides being writen in portuguese, my native language. When it is more presentable I'll show it, but i'm very happy with the results so far. Caio Barros 2010/11/4 Lorenzo Sutton lsut...@libero.it This is an interesting topic... but just to give you another direction/point of view, as I'm not sure exactly what your final aim is. You can hook up any jack-aware program that does notation to Pd via midi (for e.g. Rosegarden or even MuseScore) this, can be both ways (Pd could send midi data to these programs, for example to do the algorithmic assisted composition stuff). Not sure if anything of this makes sense to you. Lorenzo Caio Barros wrote: Hello guys. I've been dreaming about an object that would display musical notation and output data (like midi numbers for instance). I found a discutions about something like that here in our list ( http://www.mail-archive.com/pd-list@iem.at/msg19969.html) but this was a discussion about creating live musical notation for performance, and what I have in mind is something more like a Computer Assisted CompoResearch tool. If i'm not mistaken Open Music and PWGL (http://www2.siba.fi/PWGL/) already have something like this. Look at the images I made of how this object would look like: - The input would be a message with the midi number of the pitch, and the object would display a Treble or Bass cleff with the note and output the number of the pitch through the outlet (cleff_pd_01.png). - It would be possible to alterate the pitch by holding and dragging the mouse (cleff_pd_02.png) - Chords could be made... (cleff_pd_03.png) - or melodies... (cleff_pd_04.png) - or even sequences of chords. (cleff_pd_05.png) The output could easily be transformed into notation for lilypond, for instance (like Collin Oldham did in that thread I mentioned). Do you think it's possible to do something like that? At the moment I don't have the money to pay a programmer to do that (I would happily do it if I could). Maybe I can learn how to do this, but I don't know where to start. I already see some complications to build this object: - it would have to stretch itself so the chords and melodies would fit; - It would have to decide what cleff to use (or maybe not, the user could send a message like [treble); - There should have a way to choose between flat and sharp; - A nice thing would be to have more than one staff at once, like a piano staff for instance, and so on... For now I'm just wondering if something like this could be done. I've been doing some calculations of composition techniques using Pd and I miss musical notation so much. Bye! Caio Barros Bonus: I made an abstraction to transform midi note to pitch name and also frequency as a part of a bunch of composition tools I use. (and after I read those threads about creating the notation object in GEM I discovered that some people already did it, but here it go anyway). see midi_note.pd ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Musical notation object on Pd
Oh yes, and another thing is that I want eventualy to use microtonal intervals too. I believe that using those programs as a midi interface doesn't work for that, am I right? 2010/11/5 Caio Barros caio.bar...@gmail.com João: what you are saing sounds good, but in that discussion I could hardly see how that object works. Bernardo: That looks awesome and is almost in the same direction I had in mind (I was definetly thinking in CAC programms) too bad article doesn't have a download link, I wonder if that program can output data besides taking it and transforming into notation. Lorenzo: that makes sense but I don't know how to do it, this can be of great great help but I still think that an object inside Pd would be much more confortable. Like Marcus Bittencourt say in the article, the idea would be to incorporate some CAC tools into Pd and ultimately make a free, open-source tool for both things. I could make those calculations i'm doing using another program (at the end it's all just numbers) but, first, the program I know best is Pd, and second, I like to use a tool made for music to do musical calculations. In my oppining the thing is that this kind of interface is much more human friendly (at least musicianship friendly) and makes the interaction more fun and visualization of the problems easier. Just to put it in a context, what i'm doing right now is buiding a patch to calculate the harmonic nets (or harmonic networks, I don't know what is the best translation), a composition technique created by the belgian composer Henri Pousseur. At the moment this patch is too much crude for me to share it, besides being writen in portuguese, my native language. When it is more presentable I'll show it, but i'm very happy with the results so far. Caio Barros 2010/11/4 Lorenzo Sutton lsut...@libero.it This is an interesting topic... but just to give you another direction/point of view, as I'm not sure exactly what your final aim is. You can hook up any jack-aware program that does notation to Pd via midi (for e.g. Rosegarden or even MuseScore) this, can be both ways (Pd could send midi data to these programs, for example to do the algorithmic assisted composition stuff). Not sure if anything of this makes sense to you. Lorenzo Caio Barros wrote: Hello guys. I've been dreaming about an object that would display musical notation and output data (like midi numbers for instance). I found a discutions about something like that here in our list ( http://www.mail-archive.com/pd-list@iem.at/msg19969.html) but this was a discussion about creating live musical notation for performance, and what I have in mind is something more like a Computer Assisted CompoResearch tool. If i'm not mistaken Open Music and PWGL (http://www2.siba.fi/PWGL/) already have something like this. Look at the images I made of how this object would look like: - The input would be a message with the midi number of the pitch, and the object would display a Treble or Bass cleff with the note and output the number of the pitch through the outlet (cleff_pd_01.png). - It would be possible to alterate the pitch by holding and dragging the mouse (cleff_pd_02.png) - Chords could be made... (cleff_pd_03.png) - or melodies... (cleff_pd_04.png) - or even sequences of chords. (cleff_pd_05.png) The output could easily be transformed into notation for lilypond, for instance (like Collin Oldham did in that thread I mentioned). Do you think it's possible to do something like that? At the moment I don't have the money to pay a programmer to do that (I would happily do it if I could). Maybe I can learn how to do this, but I don't know where to start. I already see some complications to build this object: - it would have to stretch itself so the chords and melodies would fit; - It would have to decide what cleff to use (or maybe not, the user could send a message like [treble); - There should have a way to choose between flat and sharp; - A nice thing would be to have more than one staff at once, like a piano staff for instance, and so on... For now I'm just wondering if something like this could be done. I've been doing some calculations of composition techniques using Pd and I miss musical notation so much. Bye! Caio Barros Bonus: I made an abstraction to transform midi note to pitch name and also frequency as a part of a bunch of composition tools I use. (and after I read those threads about creating the notation object in GEM I discovered that some people already did it, but here it go anyway). see midi_note.pd ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] overdriven speaker
Hi Mathieu - again, sorry for the big delay. I was a bit busy the past 2 weeks. On 22.10.2010 07:35, Mathieu Bouchard wrote: On Thu, 21 Oct 2010, Martin Schied wrote: Isn't the heat proportional to the mean power ? Then you just do [*~] with itself and then some kind of [rpole~] to account for the accumulation thereof. After that I don't really know what to do with that. one could feed the output of this [rpole~] into a [*~] to the input signal (or at any place later, but then it has to be cared for the delay of the doppler vd~ too, so better do it first). Why would you be doing the doppler first ? The heat is generated first, in the moving coil, but the doppler is relative to the observer, who comes at the very end in the data flow from the amp to the ear. Thus it seems to me that the [vd~] should come at the very end. yes, absolutely... How does one take the réactance into account, again ?... then we'd have to change the first [*~] to account for ampères not following volts, and do we have to change the other [*~] too ? I think there are 2 main factors where reactance is important. The first is the varying current flow for heat, the second is the varying frequency response of the speaker. However I'm not knowing of a possibility to model the circuit so you actually have a current and a voltage signal. To calculate the heat production the voltage isn't used. You have to know the resistance of the coil and the current flowing through it. And since the force on the cone relates on the current flow (and this is what we hear) and not the voltage we should just not care about the voltage and assume the signal in pd is the current signal. Or expressed in other words the system should be treated like no difference in current and voltage can happen. At least it seems to me this makes a lot of things easier and the audibe effects could be estimated. At least for me a realistic modeling with verification is out of my knowlegde and also my time capabilities are limited at the moment... I think there aren't many too. The only case I can imagine and I heard of is for huge negative signals, where you can't go beyond 0 pascal of air pressure and the signal is clipped physically - but I doubt this ever happens in small speakers. Also I'm not sure if this only happens in compression speakers. I doubt that it (getting close to 0 pascal) happens at all. It sounds more like a weapon of mass destruction, than like something for listening to. Though... in some ways, it does happens, at a very small scale. What's the speed of air molecules, and how much time do they take to fill the void made by the speaker moving ? What happens if the speaker moves faster than that ?... (and is that actually the Doppler effect said using different words ?) That's beyond my knowledge, but I think that's not the point. If you calculate the maximum pressure before the negative peak is zero you have an spl of approximately 135dB which is not that much for pressure levels directly in front of a speaker - possibly I calculated it wrong? I used: air pressure: 101.325 Pa and /p/_0 = 20 µPa RMS, which gave me 134.09 dB (for a wave with RMS of 101.325 Pa - so ideally I would have to take this as peak level but that doesn't change much, only factor sqrt(2)). I don't know what you mean here by «enclosed volume», «free field», nor «radiation resistance». radiation resistance is the same like impedance, but for mechanical systems. You can treat the spring/mass system of the speaker and the air similar to an electrical circuit driving an antenna as far as I understood. And similar to electrical load you can have pure reactance and pure resistance. Unfortunately the internet isn't very wise concerning acoustics and speaker systems and is full of voodoo and homeopathy instead using the same vocabulary, so I could not find very much about it on a quick search. By enclosed volume I thought of an air tight wooden box with no holes other than that for the speaker in it - just like most older conventional speakers. Pressing the membrane into the box creates a pressure proportional to the excitation of the cone and not anymore to the acceleration. I think this closed volume would be called a high radiation resistance, because the pressure (analog to the voltage) is high for very small air flow (analog to the current). Martin ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Boomerang for Pd
Howdy all,A friend and I made a small patch for class demonstration to replicate the delay line used for Richard Serra and Nancy Holt's 1974 "Boomerang". The speed of the delay is such that the returning voice confuses the brain of the speaker causing slower speech and comprehension. It is a very simple, but elegant idea and everyone enjoyed trying it.http://danomatika.com/blog/boomerang-for-pd/ boomerang.pd Description: Binary data Dan Wilcoxdanomatika.comrobotcowboy.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] ubuntu ppa's
I'd like to contribute to the puredyne ppa's at launchpad. I always find myself needing mp3cast~ oggcast~ and a few other externals that don't come with PD. The ppa's are a great treat when installing and using PD. I was wondering if someone could help me get up to speed on how to make a ppa, maybe with a simple example I can just copy and paste. I'd like to then pacakage mp3cast~ and oggcast~ (or, rather the entire pdogg suite). Roman, it would also be great if you could add gmerlin to your ppa list. Is that difficult? I'd think it wouldn't be too much work if you already have the others (gavl, etc). -august. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
