zipper noise in chorus effect

stefan · 2 May 2005

You can't modulate the delay length of the current delay. Tell Malc and Jorge to give us a new one... 🙂

ik · 2 May 2005

Tell Malc and Jorge to give us a new one...

OK.... :

Malc and Jorge, give us a new one... 😀 ik.

malc · 2 May 2005

Oi Jorge, get these poor guys a new one! 😉

Tom7777 · 2 May 2005

I think a delay module with float inputs for time would be cool and then you could set the time really low like 0.15 for those cool metal sounding delay effects, 🙂

stefan · 2 May 2005

Tom7777 wrote: I think a delay module with float inputs for time would be cool and then you could set the time really low like 0.15 for those cool metal sounding delay effects, 🙂

Uhm. You can do that anyway? Set it to like... 0.01 * 44100 = 441, and add some feedback.

Tom7777 · 2 May 2005

Yeah i know, but i just mean it would be better a float/time input and you have much smoother slider connections and would not have to think about the calculations each time.

malc · 2 May 2005

Tom, you can have a delay as low as one sample so 0.15 sec delay is easily possible. You are limited to whole numbers of samples though.

EDIT: bit quick off the mark Stefan 🙂

Ignoring my earlier remark (sorry JC), a new delay component has been on the agenda for a while. Unfortunately other things are taking priority. The delay stuff (modulation + fractional) as well as audio buffers can all be provided by implementing arrays in the code component. This means we could cover several bases with this one feature.

The problem is that it's not an easy job but we're definitely going to do it. Sorry it's taking a while to get round to it.

Malc.

unkargherth · 2 May 2005

Although i coded some delays in the past, and it's clear to me how to implement it, ( provided i have a buffer facility and controlable read/write pointers to it) I never really understood what is the "fractional" issue rlated to delays ( or at least, i don't know it by that name). Could somebody explain it in detail, please?

Tom7777 · 2 May 2005

Ok i think it would be a better format though with a seconds input for the new delay module as it would be so much simpler to just connect a float and then its all done without having to think about anything else.

stefan · 2 May 2005

Tom7777 wrote: Ok i think it would be a better format though with a seconds input for the new delay module as it would be so much simpler to just connect a float and then its all done without having to think about anything else.

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Just wrap the delay module up in a module having the conversion built in into it. Don't put that conversion by default in the delay module, because it will eat cpu cycles even if you don't need such a conversion.

stefan · 2 May 2005

unkargherth wrote: Although i coded some delays in the past, and it's clear to me how to implement it, ( provided i have a buffer facility and controlable read/write pointers to it) I never really understood what is the "fractional" issue rlated to delays ( or at least, i don't know it by that name). Could somebody explain it in detail, please?

In one word: Interpolation.

It's good to have when you want to sweep the delay time (as with chorus and flanger effects), because as we all know, non-interpolated playback sounds bad. Also it's good when you want to build resonators using the delays, because you need quite precise delay lengths then.

If we had arrays we would get this "for free". So don't worry about the fractional delay issue, it will be solved by some of us when we get the arrays.

Like this: (this is not code you can use, just an example)

float delay int pos = (int)delay; float fraq = delay - pos

out = buff[pos] * (1 - fraq) + buff[pos+1] * fraq

Tom7777 · 2 May 2005

Ahh ok, thats a good method to do it i think 🙂

unkargherth · 2 May 2005

stefancrs wrote: In one word: Interpolation.

Then I Understand. Always used it in the past. Usually linear, but in some special casses tried Hermite interpolation, although seems a bit CPU heavy

Once we have buffers should be fairly straigh to implement in code module

Thanks stefan

EDIT:

Ps: stefan, check your PM

Shifrin · 3 May 2005

Myself and someone else (I forget who) have asked for fractional delay times, and a poly delay - for use in PM synths. I'm sure we'll get it sooner or later 😉

Shif.