Hello. I would like to implement a reverberator, my GVerb
and a couple of others I have implemented in my Lexiclone
(unpublished).

delayr/deltapi/delayw are exactly what I need, but
how to manage multiple delay lines?

I need to implement following:
d1 = delay_read(dl1,dt1_0);
d2 = delay_read(dl2,dt2_0);
fb1 =  // FDN matrix here
fb2 =  // FDN matrix here
out1 = delay_read(dl1,dt1_1) + delay_read(dl1,dt1_2) + delay_read(dl1,dt1_3);
out2 = delay_read(dl2,dt2_1) + delay_read(dl2,dt2_2) + delay_read(dl2,dt2_3);
delay_write(dl1,fb1); // write and advance
delay_write(dl2,fb2);

If I got that correctly, it is basic FDN section with tapped delays.
If I place
  delayr
  delayr
  deltapi deltapi ***
  delayw
  delayw
how Csound knows what delaylines are tapped?

Could you (we) add delay opcodes which use name ids?

Note: I'm not sure if separate delayr and deltapi are
really needed. In C, I have delay_read(delayline,delaytime)
which can be used to tap the delayline. Then I have
delay_write(delayline,sample) which writes and advances
the delayline. I have also tested _read(), _write(), _advance()
triple where write() may add to the delayline, instead of
replacing.

I will implement all building blocks and the complete reverb
as UDOs. It is interesting to see if this project halts to
some Csound limitation.

Juhana

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I'm not sure I understand all details,
but for separate delay lines, you would do:

delayr
deltapi
delayw

delayr
deltapi
delayw

and for multiple taps from one delay line, you would do:

delayr
deltapi
deltapi
deltapi
delayw

For an example of an FDN reverb, try looking at the "Sean Costello" reverb.
That is a Csound omplementation of a reverb design from Julius O Smith.
I've forgotten where to find a link to the original code, it's used in
a lot of Csound projects,
probably someone else has a link.

Oeyvind



2009/2/10 Juhana Sadeharju :
> Hello. I would like to implement a reverberator, my GVerb
> and a couple of others I have implemented in my Lexiclone
> (unpublished).
>
> delayr/deltapi/delayw are exactly what I need, but
> how to manage multiple delay lines?
>
> I need to implement following:
> d1 = delay_read(dl1,dt1_0);
> d2 = delay_read(dl2,dt2_0);
> fb1 =  // FDN matrix here
> fb2 =  // FDN matrix here
> out1 = delay_read(dl1,dt1_1) + delay_read(dl1,dt1_2) + delay_read(dl1,dt1_3);
> out2 = delay_read(dl2,dt2_1) + delay_read(dl2,dt2_2) + delay_read(dl2,dt2_3);
> delay_write(dl1,fb1); // write and advance
> delay_write(dl2,fb2);
>
> If I got that correctly, it is basic FDN section with tapped delays.
> If I place
>  delayr
>  delayr
>  deltapi deltapi ***
>  delayw
>  delayw
> how Csound knows what delaylines are tapped?
>
> Could you (we) add delay opcodes which use name ids?
>
> Note: I'm not sure if separate delayr and deltapi are
> really needed. In C, I have delay_read(delayline,delaytime)
> which can be used to tap the delayline. Then I have
> delay_write(delayline,sample) which writes and advances
> the delayline. I have also tested _read(), _write(), _advance()
> triple where write() may add to the delayline, instead of
> replacing.
>
> I will implement all building blocks and the complete reverb
> as UDOs. It is interesting to see if this project halts to
> some Csound limitation.
>
> Juhana
>
> ------------------------------------------------------------------------------
> Create and Deploy Rich Internet Apps outside the browser with Adobe(R)AIR(TM)
> software. With Adobe AIR, Ajax developers can use existing skills and code to
> build responsive, highly engaging applications that combine the power of local
> resources and data with the reach of the web. Download the Adobe AIR SDK and
> Ajax docs to start building applications today-http://p.sf.net/sfu/adobe-com
> _______________________________________________
> Csound-devel mailing list
> Csound-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/csound-devel
>

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On Tue, Feb 10, 2009 at 4:58 PM, Juhana Sadeharju  wrote:

> If I got that correctly, it is basic FDN section with tapped delays.
> If I place
>  delayr
>  delayr
>  deltapi deltapi ***
>  delayw
>  delayw
> how Csound knows what delaylines are tapped?

If you have nested delay lines, taps always refer to the innermost
delay line.  You can access both lines like this:

delayr
asig_outer deltapi ...  ;read from outer delay line
delayr
asig_innter deltapi ... ; read from inner delay line
delayw
delayw

John Lato

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Olivier Bélanger wrote:
> http://www.csounds.com/udo/displayOpcode.php?opcode_id=70

And what do I see at the top?

opcode SCReverb, aa, aakkjpo

	setksmps 1

Of course feedback will work if sr=kr.  I worked with 
exactly this example before it was a standard opcode.  I did 
have it working reasonably well for an arbitrary control 
rate.  But I was never happy that I was getting the same 
sound as when sr=kr.

If nesting delay lines is supposed to work, fine.  I had 
examples before that seemed to show that it wasn't.  I lost 
them when moving computers, though, so if people are happy 
with it now, and it's documented, no problem.


                    Graham

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