the classic algorithm is quite simple (and low fi / noisey) - you use
zero-crossing detections too derive a square wave, then divide that in
half
https://en.wikipedia.org/wiki/Octave_effect

You'd want to band limit that for digital of course.

On Wed, Jan 29, 2020 at 2:17 PM Johann Philippe
<000002c2c0737523-dmarc-request@listserv.heanet.ie> wrote:
>
> Hello Mikoláš,
>
> I'm not sure what you mean exactly by octave divider ?
> And I guess that by oldschool way you mean to implement it yourself ?
>
> Bests
> Johann
>
> Le mercredi 29 janvier 2020 à 13:19:52 UTC+1, Mikoláš Štrajt  a écrit :
>
>
> Hi,
> I would like to create String synthetiser with Csound.
>
> I wanna sound as analog as possible, so I want to create sounds with octave divider but I have no idea how to implement it.
>
> I am pretty sure that there is a opcode for that but I cannot figure which.
>
> (I understand, that I can simply use another oscillator/VCO with cpsmidinn(inotnum-12) but I want go oldschool way).
>
> --
> Severák
> http://tilde.town/~severak/
>
> 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

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

I wonder if it's possible to implement it without aliasing ( without having to say oversample etc). The derived square wave is non-bandlimited, is it not?

I often wondered about this. 

Prof. Victor Lazzarini
Maynooth University
Ireland

> On 29 Jan 2020, at 22:57, Justin Smith  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.
> 
> the classic algorithm is quite simple (and low fi / noisey) - you use
> zero-crossing detections too derive a square wave, then divide that in
> half
> https://en.wikipedia.org/wiki/Octave_effect
> 
> You'd want to band limit that for digital of course.
> 
>> On Wed, Jan 29, 2020 at 2:17 PM Johann Philippe
>> <000002c2c0737523-dmarc-request@listserv.heanet.ie> wrote:
>> 
>> Hello Mikoláš,
>> 
>> I'm not sure what you mean exactly by octave divider ?
>> And I guess that by oldschool way you mean to implement it yourself ?
>> 
>> Bests
>> Johann
>> 
>> Le mercredi 29 janvier 2020 à 13:19:52 UTC+1, Mikoláš Štrajt  a écrit :
>> 
>> 
>> Hi,
>> I would like to create String synthetiser with Csound.
>> 
>> I wanna sound as analog as possible, so I want to create sounds with octave divider but I have no idea how to implement it.
>> 
>> I am pretty sure that there is a opcode for that but I cannot figure which.
>> 
>> (I understand, that I can simply use another oscillator/VCO with cpsmidinn(inotnum-12) but I want go oldschool way).
>> 
>> --
>> Severák
>> http://tilde.town/~severak/
>> 
>> 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
> 
> 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