[PD] [ot] hdsp multiface problem / sample clock source

derek holzer derek at x-i.net
Mon Jan 5 23:02:15 CET 2004


Tim Blechmann wrote:


> but i didn't manage to play any sound from the computer ... i can
> start jack / pd / spiralmodular, but all i hear is a distorted sound,
> that sounds a bit similar to what i expect the signal to sound ... the
> pitch of the distortion changes when i change the rate of the
> sample clock source ... any idea what could cause this behaviour ?

Have anything to do with blocksize and audiobuff of the applications, 
not Jack?

Which versions of Jack and ALSA and from where?

Did you try to change the frames per period? What happens if you only 
use native Jack clients? Try routing sound into Jack, through Jack Rack 
and out again.

> btw, i can't start jack when i set the sample clock source to values
> greater than 62khz ...

you need to change the mode of the card to Double Speed to use higher 
sampling rates. see here:

http://www.linuxjournal.com//article.php?sid=7024

> the strangest thing ... when starting the audio application, the output
> signal that is routed from the input channels has these distortions,
> too, until i stop the application... 
> 

Sounds like a question for Linux-Audio-User or Jack lists. They also 
have some HDSP specialists there!

goodluck,
d.

-- 
derek holzer ::: http://www.umatic.nl
---Oblique Strategy # 82:
"Honor thy error as a hidden intention"





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