Re: [PD] PhD Defense / Acknowledgement to the Pd-list
Congratulations on finishing it! Hope the defense went well. .hc On Apr 10, 2012, at 12:49 AM, Alexandre Torres Porres wrote: Hi Folks I defend my PhD thesis this friday here in Brazil. I'd like to share it with you because this list has always been very helpful, I actually made a remark about it in my acknowledgements. And I also put a special remark to all who were here for PdCon09, that was a great experience for me! :) My draft text, submitted to the board, is at the following link; https://docs.google.com/open?id=0B3AoiT0xk8fnZThjOWQ3YzUtOGUzYS00NGVjLTkwN2QtZjE1MmExZDY0Y2Ey I shall update it though after friday according to the feedback. Then I'll release an official one later one. Wish me luck. I know most of you can't read portuguese, sorry. I've used lots of Pd in the research as you might wonder, and there several figures on the text all made from patches. As soon as I get to clean them all along with the text, I'll spread it out over here. Thanks a lot people 'til next time Alex ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list [W]e have invented the technology to eliminate scarcity, but we are deliberately throwing it away to benefit those who profit from scarcity. -John Gilmore ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] PhD Defense / Acknowledgement to the Pd-list
Good luck with the defense! On Fri, Apr 20, 2012 at 9:55 AM, Hans-Christoph Steiner h...@at.or.at wrote: Congratulations on finishing it! Hope the defense went well. .hc On Apr 10, 2012, at 12:49 AM, Alexandre Torres Porres wrote: Hi Folks I defend my PhD thesis this friday here in Brazil. I'd like to share it with you because this list has always been very helpful, I actually made a remark about it in my acknowledgements. And I also put a special remark to all who were here for PdCon09, that was a great experience for me! :) My draft text, submitted to the board, is at the following link; https://docs.google.com/open?id=0B3AoiT0xk8fnZThjOWQ3YzUtOGUzYS00NGVjLTkwN2QtZjE1MmExZDY0Y2Ey I shall update it though after friday according to the feedback. Then I'll release an official one later one. Wish me luck. I know most of you can't read portuguese, sorry. I've used lots of Pd in the research as you might wonder, and there several figures on the text all made from patches. As soon as I get to clean them all along with the text, I'll spread it out over here. Thanks a lot people 'til next time Alex ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list [W]e have invented the technology to eliminate scarcity, but we are deliberately throwing it away to benefit those who profit from scarcity. -John Gilmore ___ 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] (OT) safely connect piezo transducer to soundcard as microphone
Hi, This is OT but I'm sure many of you have used piezo microphones sometimes. I've often connected a piezo transducer to the microphone input of my computer (and other computers) by simply soldering the two wires to the T and S of a minijack plug, and it works just fine and my soundcard hasn't suffered any damage (apparently at least). However, I am concerned that a strong sound input (e.g. hitting the piezo transducer with with fair strength) may actually generate a voltage peak (thought only for a short time) capable of damaging the soundcard, couldn't it? Also, a friend of mine did the same with his Macbook and his headphones output has stopped working (may be just a coincidence though). Is there an easy way to make it safer? I seem to remember I had read somewhere (can't find it) about connecting a 1MOhm resistor in parallel... woudl that do the trick? thanks m. ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] (OT) safely connect piezo transducer to soundcard as microphone
You could put a resistor in series to limit the current or a pair of diodes in parallel to clamp the voltage. Probably a pair of 1N4001s like this would work: IN---+--+-OUT | | ^ v | | GND--+--+- Martin On 2012-04-20 18:12, Matteo Sisti Sette wrote: Hi, This is OT but I'm sure many of you have used piezo microphones sometimes. I've often connected a piezo transducer to the microphone input of my computer (and other computers) by simply soldering the two wires to the T and S of a minijack plug, and it works just fine and my soundcard hasn't suffered any damage (apparently at least). However, I am concerned that a strong sound input (e.g. hitting the piezo transducer with with fair strength) may actually generate a voltage peak (thought only for a short time) capable of damaging the soundcard, couldn't it? Also, a friend of mine did the same with his Macbook and his headphones output has stopped working (may be just a coincidence though). Is there an easy way to make it safer? I seem to remember I had read somewhere (can't find it) about connecting a 1MOhm resistor in parallel... woudl that do the trick? thanks m. ___ 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] (OT) safely connect piezo transducer to soundcard as microphone
Hi, A piezo transducer often produces a signal level somewhere inbetween mic level and line level (it depends on size, and method of excitation). Indeed it can be too loud when mic input is used. Another point of concern is impedance, which influences the sound character. If you mount a resistor (in series), the signal level is reduced but the sound is altered as well. Mounting a capacitor (in parallel or series) also works to reduce signal level and alter the sound. Combinations of these (RC networks, effectively) are a great way to tune the sound character to your liking, but it takes a lot of experimentation. Also, the result may be different for each (mic) preamp because input impedance is not fully standardized. Katja On Sat, Apr 21, 2012 at 12:12 AM, Matteo Sisti Sette matteosistise...@gmail.com wrote: Hi, This is OT but I'm sure many of you have used piezo microphones sometimes. I've often connected a piezo transducer to the microphone input of my computer (and other computers) by simply soldering the two wires to the T and S of a minijack plug, and it works just fine and my soundcard hasn't suffered any damage (apparently at least). However, I am concerned that a strong sound input (e.g. hitting the piezo transducer with with fair strength) may actually generate a voltage peak (thought only for a short time) capable of damaging the soundcard, couldn't it? Also, a friend of mine did the same with his Macbook and his headphones output has stopped working (may be just a coincidence though). Is there an easy way to make it safer? I seem to remember I had read somewhere (can't find it) about connecting a 1MOhm resistor in parallel... woudl that do the trick? thanks m. ___ 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] Help with Jack and PD
On Thu, Apr 19, 2012 at 9:49 AM, Rishabh Natarajan rishabh.natara...@gmail.com wrote: 1. When starting pd with jack and 16 channels, does this mean that all 16 channels have to go in and out of Jack itself? no. 2. Do the number of input and output channels have to be the same (8 and 8 in this case) or can they be different? they can be different. When I tried starting pd with 18 channels and then assigned 16 to Jack incoming and 2 to built-in output for outgoing, terminal threw an error saying 'invalid number of channels' I am not sure on this one but I think that if Pd does not find as many physical (or jack) inputs or outputs it will warn you. When you do provide enough IO you can reconfigure Pd for the new values and it should work (if you cross your fingers). 3. I want to have 8 channels from one adc~ and another 8 from the other. This means all 16 channels are meant for input. How then do I route output from pd to the speakers? you specify -audioindev 1,2 for example. You can specify -audiooutdev in the same way and then you create the appropriate [dac~] objects. BTW, I believe you can create aggregate devices on Mac (somewhere in the sound preferences, I believe JackPilot manuals mentions that) to combine different audio inputs and outputs. I vaguely recall doing something like this in the past. Then you tell jack to use your aggregate, this may simplify your setup routine... 4. If I am only inputting 16 channels through Jack can I use the dac~ object to output sound from pd to the speakers? if you run jack (and pd with -jack) then your [dac~] objects can be connected to jack's outputs, i.e. Pd's inputs and outputs will appear in JackPilot and you can route them any way you want to your system provided I/O. Assuming that JackPilot uses the actual physical I/O, you should be able to output sound from Pd to the speakers. HTH, ./MiS ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] (OT) safely connect piezo transducer to soundcard as microphone
Piezo mics should go through a very high impedance buffer stage. When I say high impedance, I'm talking 10 megohms minimum. 1 Meg is too low, it basically will act as a high pass filter and your piezo will sound tinny. This page explains all and has a cute 1 stage FET buffer. I have built about 10 of these buffers and they work perfectly, sound great and do not clip: http://www.muzique.com/news/piezo-pickups/ I bought generic 1 stage buffer PCBs from MusikDing and they keep the buffer circuitry tidy. The circuits, batteries and connectors were housed in guitar pedal/DI style boxes If you want to tame piezo transients, you can use a small coil. This is what Roland do in those drums pads units - they stick a coil in series with the piezo to smooth out the peaks (a bit like a tiny compressor... ish) For high-quality sound, don't use piezo - MEAS film contact mics are better. They are more expensive, but some outfit in Canada sent me a bunch for not much money so not too bad. They are finicky to solder - we're talkin' low wattage irons, lead solder (sorry ROHS) and heatsink clips. You can also use an active DI box to interface your piezos - one that has a high impedence input. Normal Line level inputs are not high enough impedance for piezos, by the way. I've used BSS DI's on piezos and they sound great. I've also experimented with those cheapo Behringer active DIs - and they sound very good on piezos too. They come in a phantom/battery-powered stereo DI version for about 20 euro - 2 piezos to 2 channels on your desk per DI. Rich Duckworth Lecturer in Music Technology Department of Music House 5 Trinity College Dublin 2 Ireland Tel 353 1 896 1500 It's the most devastating moment in a young mans life, when he quite reasonably says to himself, I shall never play The Dane! From: pd-list-requ...@iem.at pd-list-requ...@iem.at To: pd-list@iem.at Sent: Saturday, 21 April 2012, 0:17 Subject: Pd-list Digest, Vol 85, Issue 61 Send Pd-list mailing list submissions to pd-list@iem.at To subscribe or unsubscribe via the World Wide Web, visit http://lists.puredata.info/listinfo/pd-list or, via email, send a message with subject or body 'help' to pd-list-requ...@iem.at You can reach the person managing the list at pd-list-ow...@iem.at When replying, please edit your Subject line so it is more specific than Re: Contents of Pd-list digest... Today's Topics: 1. Re: PhD Defense / Acknowledgement to the Pd-list (Hans-Christoph Steiner) 2. Re: PhD Defense / Acknowledgement to the Pd-list (Jim Hickcox) 3. (OT) safely connect piezo transducer to soundcard as microphone (Matteo Sisti Sette) 4. Re: (OT) safely connect piezo transducer to soundcard as microphone (Martin Peach) 5. Re: (OT) safely connect piezo transducer to soundcard as microphone (katja) 6. Re: Help with Jack and PD (Michal Seta) -- Message: 1 Date: Fri, 20 Apr 2012 09:55:55 -0400 From: Hans-Christoph Steiner h...@at.or.at Subject: Re: [PD] PhD Defense / Acknowledgement to the Pd-list To: Alexandre Torres Porres por...@gmail.com Cc: pd-lista puredata pd-list@iem.at Message-ID: d7f486b1-8d83-405d-a68e-7c6a5c023...@at.or.at Content-Type: text/plain; charset=us-ascii Congratulations on finishing it! Hope the defense went well. .hc On Apr 10, 2012, at 12:49 AM, Alexandre Torres Porres wrote: Hi Folks I defend my PhD thesis this friday here in Brazil. I'd like to share it with you because this list has always been very helpful, I actually made a remark about it in my acknowledgements. And I also put a special remark to all who were here for PdCon09, that was a great experience for me! :) My draft text, submitted to the board, is at the following link; https://docs.google.com/open?id=0B3AoiT0xk8fnZThjOWQ3YzUtOGUzYS00NGVjLTkwN2QtZjE1MmExZDY0Y2Ey I shall update it though after friday according to the feedback. Then I'll release an official one later one. Wish me luck. I know most of you can't read portuguese, sorry. I've used lots of Pd in the research as you might wonder, and there several figures on the text all made from patches. As soon as I get to clean them all along with the text, I'll spread it out over here. Thanks a lot people 'til next time Alex ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list [W]e have invented the technology to eliminate scarcity, but we are deliberately throwing it away to benefit those who profit from scarcity. -John Gilmore -- next part -- An HTML attachment was scrubbed... URL: http://lists.puredata.info/pipermail/pd-list/attachments/20120420/c3caaea8/attachment-0001
Re: [PD] Help with Jack and PD
Thanks for writing to me Michal. I guess after doing some experimentation with Jack and pd I seemed to have arrived at some of the conclusions you've mentioned here :) I will keep working on it. Regards, Rishabh On Fri, Apr 20, 2012 at 7:16 PM, Michal Seta m...@artengine.ca wrote: On Thu, Apr 19, 2012 at 9:49 AM, Rishabh Natarajan rishabh.natara...@gmail.com wrote: 1. When starting pd with jack and 16 channels, does this mean that all 16 channels have to go in and out of Jack itself? no. 2. Do the number of input and output channels have to be the same (8 and 8 in this case) or can they be different? they can be different. When I tried starting pd with 18 channels and then assigned 16 to Jack incoming and 2 to built-in output for outgoing, terminal threw an error saying 'invalid number of channels' I am not sure on this one but I think that if Pd does not find as many physical (or jack) inputs or outputs it will warn you. When you do provide enough IO you can reconfigure Pd for the new values and it should work (if you cross your fingers). 3. I want to have 8 channels from one adc~ and another 8 from the other. This means all 16 channels are meant for input. How then do I route output from pd to the speakers? you specify -audioindev 1,2 for example. You can specify -audiooutdev in the same way and then you create the appropriate [dac~] objects. BTW, I believe you can create aggregate devices on Mac (somewhere in the sound preferences, I believe JackPilot manuals mentions that) to combine different audio inputs and outputs. I vaguely recall doing something like this in the past. Then you tell jack to use your aggregate, this may simplify your setup routine... 4. If I am only inputting 16 channels through Jack can I use the dac~ object to output sound from pd to the speakers? if you run jack (and pd with -jack) then your [dac~] objects can be connected to jack's outputs, i.e. Pd's inputs and outputs will appear in JackPilot and you can route them any way you want to your system provided I/O. Assuming that JackPilot uses the actual physical I/O, you should be able to output sound from Pd to the speakers. HTH, ./MiS ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
