[Csnd] How shift pitch continuously?

Date	2017-09-20 04:51
From	boleszek
Subject	[Csnd] How shift pitch continuously?
	Hello Csound community, As a new user I realize this may be a simple question with a simple answer, but how can I make a continuous pitch sweep? If I run the following score using a simple oscillator instrument (and a short duration) to raise the pitch from 440Hz to 470Hz I get a horrible glitchy sound because the instrument is accenting every single pitch increment. f1 0 1024 10 1 ; start drur amp fq tbl i1 0 0.02 10000 440 1 i1 + . . 441 1 i1 + . . 442 1 i1 + . . 443 1 i1 + . . 444 1 i1 + . . 445 1 i1 + . . 446 1 i1 + . . 447 1 i1 + . . 448 1 i1 + . . 449 1 i1 + . . 450 1 i1 + . . 451 1 i1 + . . 452 1 i1 + . . 453 1 i1 + . . 454 1 i1 + . . 455 1 i1 + . . 456 1 i1 + . . 457 1 i1 + . . 458 1 i1 + . . 459 1 i1 + . . 460 1 i1 + . . 461 1 i1 + . . 462 1 i1 + . . 463 1 i1 + . . 464 1 i1 + . . 465 1 i1 + . . 466 1 i1 + . . 467 1 i1 + . . 468 1 i1 + . . 469 1 i1 + . . 470 1 I’ve tried to shorten the duration thinking that maybe it was just too coarse, but that seemed to make the sound uglier. I am treating dur as a sort of sampling rate here, which I realize is not how this is designed to work. I’m working on a fun project where I ultimately want to use neural data (sampled at 3kHz) to control the pitch continuously, but at this point I just want to be able to smoothly shift the pitch of a simple sinusoid. Any help would be greatly appreciated! Thanks, Bo -- Sent from: http://csound.1045644.n5.nabble.com/Csound-General-f1093014.html Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2017-09-20 06:21
From	Forrest Curo
Subject	Re: [Csnd] How shift pitch continuously?
	Use a k-rate (or even a-rate) variable to control the pitch of an oscillator. Put them into an instrument that (fairly) smoothly changes that variable. In the score, use one p-field as a starting point, another as an end point for the change, maybe a third to set the rate or the time elapsed from start to finish.... There are many ways possible. If you aren't too concerned about specifying the curve precisely, just want a smooth change... there's an opcode specifically for that (but it's fallen out of my head at the moment. Not 'ramp', but a similar term.) On Tue, Sep 19, 2017 at 8:51 PM, boleszek <boleszeko@gmail.com> wrote: Hello Csound community, As a new user I realize this may be a simple question with a simple answer, but how can I make a continuous pitch sweep? If I run the following score using a simple oscillator instrument (and a short duration) to raise the pitch from 440Hz to 470Hz I get a horrible glitchy sound because the instrument is accenting every single pitch increment. f1 0 1024 10 1 ; start drur amp fq tbl i1 0 0.02 10000 440 1 i1 + . . 441 1 i1 + . . 442 1 i1 + . . 443 1 i1 + . . 444 1 i1 + . . 445 1 i1 + . . 446 1 i1 + . . 447 1 i1 + . . 448 1 i1 + . . 449 1 i1 + . . 450 1 i1 + . . 451 1 i1 + . . 452 1 i1 + . . 453 1 i1 + . . 454 1 i1 + . . 455 1 i1 + . . 456 1 i1 + . . 457 1 i1 + . . 458 1 i1 + . . 459 1 i1 + . . 460 1 i1 + . . 461 1 i1 + . . 462 1 i1 + . . 463 1 i1 + . . 464 1 i1 + . . 465 1 i1 + . . 466 1 i1 + . . 467 1 i1 + . . 468 1 i1 + . . 469 1 i1 + . . 470 1 I’ve tried to shorten the duration thinking that maybe it was just too coarse, but that seemed to make the sound uglier. I am treating dur as a sort of sampling rate here, which I realize is not how this is designed to work. I’m working on a fun project where I ultimately want to use neural data (sampled at 3kHz) to control the pitch continuously, but at this point I just want to be able to smoothly shift the pitch of a simple sinusoid. Any help would be greatly appreciated! Thanks, Bo -- Sent from: http://csound.1045644.n5.nabble.com/Csound-General-f1093014.html Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

Date	2017-09-20 07:19
From	boleszek
Subject	Re: [Csnd] How shift pitch continuously?
	Thanks for the suggestions. I'm learning about k-rate and a-rate, but I'm not sure that will help me with my ultimate goal. I'm looking for a way to control the pitch of an oscillator (or any tonal instrument for that matter) with arbitrary waveforms. I'm a neuroscientist at the University of Chicago, and I have electrical signals that I've recorded from rat brains that I would like to sonify. These signals alternate between gamma band (60-100Hz) and beta band (15-30Hz) oscillations so I was hoping to use the signal's instantaneous frequency as an input to control the pitch. I also plan on collaborating with an EEG lab in my building to allow people to hear their own brain waves in real time. Any suggestions on how to get an arbitrary waveform to smoothly control a parameter like pitch? Thanks a lot! B P.S. When I do eventual sonify the neural data I will make a little website for it and post the link here! -- Sent from: http://csound.1045644.n5.nabble.com/Csound-General-f1093014.html Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here

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