Hi Csounders,

I would like to make control signals that emulate somewhat how (I think) human pitch deviations work. I haven't measured, but I'm pretty sure when I play a saxophone, my intonation does a kind of "idling" as one does on a unicycle. I think I go up and down around the target pitch, where the distribution is somewhat gaussian I guess? As in, mostly it's pretty centered, sometimes it's too high or low, and the variance around those is clustered around good. And further, it does some kind of an lfo like vibrato, but the speed and depth of the vibrato varies, and I imagine does so in a kind of drunken walk.

I suspect this has been implemented many times, so figured I'd check for examples, plugins, or opcodes I missed.

thanks

iain

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Hi Iain,
I haven't implemented that precise kind of LFO, but I have implemented a kind 
of drifting, in the way of what some synthesizers might offer as "analogue 
feel".

You can certainly apply varying speed and depth to an LFO (some kind of 
oscil or table based). Using one of the table opcode (table, tablei, table3) 
you use a phasor to move through the LFO waveform. You can vary its frequency 
and depth easily with a slowly changing noise value. randh and randomh 
followed by a port/portk statement will work well. You can apply another slow 
and minimal noise value as a frequency offset, perhaps even using gauss, 
triggered every time the phasor reaches 1. Or you use one of the random 
generators with a cps parameter (like randh or randomh) again and pass it 
through a port. This value can be added to your LFO signal.

Depending on how you want to apply it to your frequency you must scale the LFO 
right. If you plan to multiply the LFO value, you should add 1 to a 0-centred 
waveform, like a normal sine or triangle.

I know, it's no code, but unless something ready-made turns up, I hope that it 
will help.

Best wishes,

Jeanette

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P.S.: I just saw Victor's mail and that reminded me that you also have rspline 
as a one stop shop solution. It can be temperamental and perhaps a bit too 
random.

Also, for that acoustic effect a simple envelope that goes from no vibrato to 
full might help. A bit of an LFO delay. possibly a kind of delay, attack or 
delay attack sustain release envelope, easily done with linseg or linenr for 
live playing.

Please excuse the unorganised reply.

-- 
  * Website: http://juliencoder.de - for summer is a state of sound
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

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Hi Iaian!
Nov 30 2024, Iain Duncan has written:
...
> As I've never used them, one thing I'm not clear on... if the range is
> -xamp to +xamp, can we be sure with either of them that the generated curve
> will cross zero on each random point? (or does anyone know a way to do
> that).
I am not quite sure about jspline, but it looks like it. With rspline, I
can only say this: I'm sure it will get close to min and max
alternatively. so if they are about equidistant, I suppose that rspline
will cross 0 a lot of the time at least. Sorry...

Best wishes,

Jeanette

-- 
  * Website: http://juliencoder.de - for summer is a state of sound
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

Open my eyes,
I look deep inside,
I run away... <3
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In case you use Cabbage, I have written an example that explores a range of opcodes that explore this sort of thing, both sonically and visually. The opcodes it covers are: randomi randomh rspline jspline jitter jitter2 vibr vibrato gaussi trandom cauchyi exprandi gendy gendyc gendyx

All worth exploring!

Best,

Iain

---

From: A discussion list for users of Csound <CSOUND@LISTSERV.HEANET.IE> on behalf of Iain Duncan <iainduncanlists@GMAIL.COM>
Sent: 30 November 2024 23:23
To: CSOUND@LISTSERV.HEANET.IE <CSOUND@LISTSERV.HEANET.IE>
Subject: Re: [Csnd] making humanized/drifting lfos

 

Hi Scott and Jeanette, that sounds like what I need. Thanks for the help!

iain

On Sat, Nov 30, 2024 at 2:52 PM Jeanette C. <julien@mail.upb.de> wrote:

Hi Iaian!
Nov 30 2024, Iain Duncan has written:
...
> As I've never used them, one thing I'm not clear on... if the range is
> -xamp to +xamp, can we be sure with either of them that the generated curve
> will cross zero on each random point? (or does anyone know a way to do
> that).
I am not quite sure about jspline, but it looks like it. With rspline, I
can only say this: I'm sure it will get close to min and max
alternatively. so if they are about equidistant, I suppose that rspline
will cross 0 a lot of the time at least. Sorry...

Best wishes,

Jeanette

--
  * Website: http://juliencoder.de - for summer is a state of sound
  * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
  * Audiobombs: https://www.audiobombs.com/users/jeanette_c
  * GitHub: https://github.com/jeanette-c

Open my eyes,
I look deep inside,
I run away... <3
(Britney Spears)

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Beyond the manual example for adsyn, I don’t know of any other examples.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 9 Dec 2024, at 21:19, Bill Alves  wrote:
> 
> *Warning*
> This email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> Are there any applications or sample code for working directly with the files generated by the hetro utility? Thanks!
> 
> Bill
> 
> Bill Alves
> Miller Professor of the Humanities
> The Claremont Colleges
> Harvey Mudd College
> 301 Platt Blvd. Claremont CA 91711
> http://pages.hmc.edu/alves/
> http://www.billalves.com/
> 
> 
> 
> 
> 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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