On Tue, Mar 29, 2016 at 10:30 AM, Paul Batchelor <ralphbluecoat@gmail.com> wrote:

A few things to try...

Make sure you are using alsa and not portaudio or pulse with the rtaudio flag

Change the hardware/software buffer sizes

Make your signal mono.

Make you samplerate 20khz?

Ksmps should be larger.

I recently figures out how to get JACK running on the pi, and it has been a dramatic improvement. You can set your samplerates to be lower than ALSA. I was able to get mincer to run in real-time on the *original* model B at 16khz. You lose fidelity, but with the crummy 11-bit DAC it's less of a sacrifice than you think.

Happy hacking,

-P

On Mar 28, 2016 01:39, "Richard" <richard@rwdobson.com> wrote:

If you have the original V1 R-Pi, I would not expect it to support real-time pvs. One of the first things I did when I got mine was to build and run command-line pvoc, and it didn't ~quite~ have enough speed for real-time. I would expect R-Pi 2 to be better. I have just taken delivery of the new v3 which should be better still, but have yet to set it up.

At a pinch it might just be Ok at a lower sample rate (and the lowest analysis rate you can get away with).

Richard Dobson

On 28/03/2016 04:42, Emmett Palaima wrote:

Hi, I am working on a live audio processor with the raspberry pi, and
was hoping to use some of the pvs opcodes in my patches, as they make
some of my favorite sounds. I am running into the issue that I can't
seem to use them on the pi without causing buffer underrun issues in the
output. I have tried making the patch as streamlined as possible, as
well as using a variety of k-rates, sample rates, buffer sizes and
window sizes. Even when I got into very low sample and k rates with very
high buffer and window sizes I can't get it to run correctly.

Is there anything else I can do to make it run more smoothly, or am I
just running up against the limitations of the technology, since pvs is
very cpu intensive. Here is my code, please let me know if you see
anything.

..

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