[ivtv-users] CX18 audio interference

[Andy Walls]

On Mon, 2009-05-04 at 13:38 -0400, faginbagin wrote:
> Hi Andy,
> 
> > I have a patch for testing at:
> > 
> > http://linuxtv.org/hg/~awalls/cx18-av-core/
> > http://linuxtv.org/hg/~awalls/cx18-av-core/rev/9beb99150ab1
> > 
> > 
> > Helen and ivtv-devel list readers,
> > 
> > This patch needs some tests run:
> > 
> > 1. Check that sound is better with the NTSC tuner
> > 2. Check that S-Video and/or Composite in with NTSC didn't break
> > 3. Check that switching back to the tuner, sound is still OK.
> > 4. Check that PAL & SECAM still work on SVideo and/or Composite
> > 5. Check that PAL and/or SECAM tuner sound is OK.
> > 
> > I'll try and test what I can during the course of this week.  I have
> > high confidence that nothing is working worse than before :), but I
> > can't check OTA PAL or SECAM (Maybe someone with a Compro H900 can
> > check?).
> > 
> > 
> > Since this bug was inhereted from the cx25840 module, I'm wondering if
> > this is the cause of the PVR-150 tinny audio.  If I can reproduce the
> > tinny audio with my PVR-150MCE, I'll try to experiment with having the
> > SIF gain controlled by the audio decoder (the correct thing todo) versus
> > the video decoder (the wrong thing todo) of the CX2584x.  This change
> > can, with some difficulty, be ported to the cx25840 module, if that
> > fixes the tinny audio.
> > 
> > Regards,
> > Andy
> 
> I downloaded the cx18-av-core repo and tested 1-3. Sound was good on a 
> couple of the previously bad channels, 29 & 41. Switching to input 1, 
> sound was still good, switching back to input 0, sound was still good on 
> channels 41 & 29.

Good.  I'm assuming your audio issues are resolved.

I was able to run tests 1-3 with Composite as the alternate input (I
need to dig up an S-Video cable), and test 4 with PAL as output by a
PVR-350 into the HVR-1600's composite.  Things were all OK - so I don't
think I broke anything.

Daniel provided positive feedback on the ivtv-devel list as well.  I'll
probably ask this to get pulled to the main v4l-dvb repo soon.

Regards,
Andy


> Let me know if there's more I should do. I'll keep this version 
> installed & make sure all is still well with mythtv.
> 
> Helen
>