Re: [PD] Osc phase and number of periods for subsonic touch-music
Hi Daniel, Sorry for the late reply on this subject. To do exactly as you describe it is possible to take the cosine or sine of a line over period. Use [vline~] as it is much more flexible. Take a line running from 0 to 1 in some time, and use the cosine function to obtain exactly one period in the same time. Note: You don't need the 2 * PI with Pure Data audio objects, they are adjusted for radians (rotation normalised so that 2*PI = 1 ) On Tue, 7 Dec 2010 23:32:48 -0800 Daniel K. konarsonarsmo...@gmail.com wrote: but it would seem more elegant if I could solve both problems by generating sine waves with finite numbers of periods that always started with the same phase. -- Andy Farnell padawa...@obiwannabe.co.uk ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Osc phase and number of periods for subsonic touch-music
Could you be more specific, im not sure I entirely understand the problem... On 8 December 2010 08:32, Daniel K. konarsonarsmo...@gmail.com wrote: I'm working on re-realizing a piece I wrote for subwoofer that is meant to be felt by touching the speaker cone instead of hearing it. This is done by using sine waves from around 15 to 26 Hz at low volume adn utilizing difference frequencies to get lower frequency pulses. My problem is that the way I have my synth set up, the osc~ objects end up receiving midi messages a unpredictable times in the period which is leading to interference and thus unintended dynamic shifts. Another problem is clicks on note-offs. I can get around those with [line~] or a low pass filter but it would seem more elegant if I could solve both problems by generating sine waves with finite numbers of periods that always started with the same phase. I haven't been able to figure out to this and I've thrown enough hours at it that I think it's time to ask for some help. Any suggestions would be much appreciated. -Daniel Konar ___ 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] Osc phase and number of periods for subsonic touch-music, (Daniel K.)
Daniel, You could make a table with a sine wave form in it and drive it with a [tabosc4~] object. The only way (as far as I know) to ensure sample accuracy for this is to set the blocksize to 1 (use the [blocksize] object). Otherwise you might run over the end of your table by as much as 63 samples and you will probably get a click (Pd defaults to calculating 64 samples at a time). Hope that helps, David ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Osc phase and number of periods for subsonic touch-music
Hi, You can reset the phase of an [osc~] by sending a message to its right inlet. In your case the message would be [0.25( , i.e. 1/4 of the way through the cosine wave form, which is zero. That won't work at the note off, though, so the sensible thing would be to use an envelope. But, if you really want precise control of phase instead, write a period of a sine wave to a table (might as well use a long one) and read through it with a [line~] and a [tabread~].If you want 20 Hz, the period in ms is 1000/20 = 50. Let's say the sine table is 4096 samples long and lives in a table: [table sine 4096]. Use [metro 50] to bang a message [0, 4096 50( to [line~] controlling [tabread~ sine]. That way, when you turn on the [metro] it will start at zero, and when you turn it off, [line~] will continue until it reaches the end of the table (which should also be a zero), and then stop. Collin On 12/08/2010 07:02 AM, pd-list-requ...@iem.at wrote: On 8 December 2010 08:32, Daniel K.konarsonarsmo...@gmail.com wrote: I'm working on re-realizing a piece I wrote for subwoofer that is meant to be felt by touching the speaker cone instead of hearing it. This is done by using sine waves from around 15 to 26 Hz at low volume adn utilizing difference frequencies to get lower frequency pulses. My problem is that the way I have my synth set up, the osc~ objects end up receiving midi messages a unpredictable times in the period which is leading to interference and thus unintended dynamic shifts. Another problem is clicks on note-offs. I can get around those with [line~] or a low pass filter but it would seem more elegant if I could solve both problems by generating sine waves with finite numbers of periods that always started with the same phase. I haven't been able to figure out to this and I've thrown enough hours at it that I think it's time to ask for some help. Any suggestions would be much appreciated. -Daniel Konar ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] Osc phase and number of periods for subsonic touch-music
On 08/12/10 07:32, Daniel K. wrote: generating sine waves with finite numbers of periods that always started with the same phase. 10 periods of 20Hz sine wave, subsample accurate timing without needing [block~]: 0, 10 500 | [vline~] | [- 0.25] | [cos~] | [dac~] For N periods of F Hz, something like this should work if my mental algebra is up to scratch: 0, N T where T = 1000 * N / F Have fun! Claude -- http://claudiusmaximus.goto10.org ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
[PD] Osc phase and number of periods for subsonic touch-music
I'm working on re-realizing a piece I wrote for subwoofer that is meant to be felt by touching the speaker cone instead of hearing it. This is done by using sine waves from around 15 to 26 Hz at low volume adn utilizing difference frequencies to get lower frequency pulses. My problem is that the way I have my synth set up, the osc~ objects end up receiving midi messages a unpredictable times in the period which is leading to interference and thus unintended dynamic shifts. Another problem is clicks on note-offs. I can get around those with [line~] or a low pass filter but it would seem more elegant if I could solve both problems by generating sine waves with finite numbers of periods that always started with the same phase. I haven't been able to figure out to this and I've thrown enough hours at it that I think it's time to ask for some help. Any suggestions would be much appreciated. -Daniel Konar ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
