Re: [Csnd-dev] [EXTERNAL] [Csnd-dev] More Daisy help

I think the second pvsynth in this code might be pushing it
Prof. Victor Lazzarini
Maynooth University
Ireland

On 12 Sep 2025, at 20:18, Dave Seidel <[email protected]> wrote:


Rory, this was running in Daisy?

On Fri, Sep 12, 2025 at 3:13 PM Rory Walsh <[email protected]<mailto:[email protected]>> wrote:
I've used ksmps=256 and fftsize=1024 and it's worked Ok for me. I've been using pvsmooth and pvsynth. Not very heavy stuff, but nice results all the same.

On Fri, 12 Sept 2025 at 20:11, Dave Seidel <[email protected]<mailto:[email protected]>> wrote:
Great, thanks very much! Still looking for the book... :-)

On Fri, Sep 12, 2025 at 1:56 PM Victor Lazzarini <[email protected]<mailto:[email protected]>> wrote:
Essentially this
https://github.com/csound/book/blob/master/part4/chapter13/13.12.csd

Prof. Victor Lazzarini
Maynooth University
Ireland

On 12 Sep 2025, at 18:41, Dave Seidel <[email protected]<mailto:[email protected]>> wrote:


Thanks, Victor. I'll try those things, though I already tried ksmps=256 and FFT size 1024 -- didn't work, but it did reduce the noise somewhat, so I think that reinforces your theory.

The delay-based approach might be fine, thanks for the suggestion. I know I have the book around somewhere, I just need to find it....

On Fri, Sep 12, 2025 at 1:17 PM Victor Lazzarini <[email protected]<mailto:[email protected]>> wrote:
Hi Dave,

this is probably because the Daisy can't compute audio in time for the interrupt.
It could be that the FFTs are too much for it.
There's a few things you could try:

increase ksmps to 256
decrease FFT size to 1024

keep ksmps at 128
decrease FFT size to 512

I have not yet tested spectral processing to see what the limits are. I can't do any testing at the moment because my Daisy seed is faulty, I'm waiting on a replacement.

An alternative to doing pvs-based pitch shifting is to use a delay line pitch shifter, which might just work ok in your case. Russell Pinkston's chapter in the Csound Book has an example you could use.

Otherwise I can send you some code.

best
Prof. Victor Lazzarini
Maynooth University
Ireland

On 12 Sep 2025, at 16:38, Dave Seidel <[email protected]<mailto:[email protected]>> wrote:


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Hi Victor,

I have a tiny project that essentially duplicates the DaisyCsoundProcess example, the only differences in the code being the changes names and the contents of csdText.

Here's the UDO I'm using, which works fine with standalone Csound. It takes an input signal and turns it into a stereo output  signal with a binaural beat. When it's executed on the Daisy, I can sort of hear the output, but it's very noisy. Is there anything in this code that you would not expect to work on the Daisy?

    opcode binauralize, aa, ak
      ain,kdiff xin

      ; take it apart
      fsig pvsanal ain, 2048, 2048/4, 2048, 1

      ; determine pitches
      ; kcent, kamp pvspitch fsig, 0.1
      kcent pvscent fsig

      if (kcent > 0) && (kdiff > 0) then
        kdiff /= 2
        krat1 = (kcent + kdiff) / kcent
        krat2 = (kcent - kdiff) / kcent
      else
        krat1 = 1
        krat2 = 1
      endif

      ; create derived streams with shifted pitches
      fsig2 = fsig
      fbinL pvscale fsig,  krat1, 0
      fbinR pvscale fsig2, krat2, 0

      ; put it back together
      aoutL pvsynth fbinL
      aoutR pvsynth fbinR

      xout aoutL, aoutR
    endop