[Csnd] delay line with negative feedback coeff

Date	2023-06-05 20:23
From	Philipp Neumann
Subject	[Csnd] delay line with negative feedback coeff
	Hello everybody! Recently i’m working a lot with delay lines for a performance project. So i’ve talked with a lot of people about this and someone recommended to try out negative feedback coefficents instead of positiv ones. But i don’t know really why. I’m also working with extrem feedback rations, higher then 1. Can someone explain what is happening when i use a negative feedback ratio with delayw ? Greetings, Philipp 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	2023-06-05 23:14
From	Aaron Krister Johnson
Subject	Re: [Csnd] delay line with negative feedback coeff
	This is an interesting concept. I imagine a negative gain would be a multiplication, but of an inverted signal. I will have to experiment with this myself! Aaron Krister Johnson Music, etc.: https://soundcloud.com/aaron-krister-johnson https://soundcloud.com/filtercreed https://www.youtube.com/channel/UC_utjGYbSizWE0dNyr0Vdmg https://aaronkristerjohnson.bandcamp.com/ http://www.untwelve.org Code: https://github.com/akjmicro On Mon, Jun 5, 2023 at 12:23 PM Philipp Neumann <kontakt@philippneumann.eu> wrote: Hello everybody! Recently i’m working a lot with delay lines for a performance project. So i’ve talked with a lot of people about this and someone recommended to try out negative feedback coefficents instead of positiv ones. But i don’t know really why. I’m also working with extrem feedback rations, higher then 1. Can someone explain what is happening when i use a negative feedback ratio with delayw ? Greetings, Philipp 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	2023-06-05 23:40
From	Victor Lazzarini
Subject	Re: [Csnd] [EXTERNAL] [Csnd] delay line with negative feedback coeff
	Using a negative feedback shifts the comb filter pole away from 0Hz, putting a dip there. That should have an effect on suppressing DC, if that's an issue for you. Prof. Victor Lazzarini Maynooth University Ireland > On 5 Jun 2023, at 20:23, Philipp Neumann 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. > > Hello everybody! > > Recently i’m working a lot with delay lines for a performance project. > So i’ve talked with a lot of people about this and someone recommended to try out negative feedback coefficents instead of positiv ones. But i don’t know really why. I’m also working with extrem feedback rations, higher then 1. > Can someone explain what is happening when i use a negative feedback ratio with delayw ? > > Greetings, > Philipp > 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