[ivtv-users] CX18 audio interference

[faginbagin]

Hi Andy,

> Before I do a lot of clean-up on some code that I think is in error,
> could you try the following.
> 
> When you are tuned to a channel with poor sound, like channel 41, please
> try these commands:
> 
> # v4l2-dbg -d /dev/video0 -c host1 -g 0x104
> ioctl: VIDIOC_DBG_G_REGISTER
> Register 0x00000104 = 71b5c00h (119233536d  00000111 00011011 01011100 00000000b)

My output:
ioctl: VIDIOC_DBG_G_REGISTER
Register 0x00000104 = 71b5c00h (119233536d  00000111 00011011 01011100 00000000b)

> # v4l2-dbg -d /dev/video0 -c host1 -s 0x104 0x07005d80
> Register 0x00000104 set to 0x7005d80

My output:
Register 0x00000104 set to 0x7005d80

> The cx18 driver is currently setting the AGC for the SIF audio input
> amplifier to set the SIF input amplifier gain based on video signal
> level.  This register change (which is tailored for an HVR-1600 set to
> the analog tuner) sets the AGC for the SIF audio input amplifier to be
> controlled by the audio signal level.
> 
> Hopefully that will make things better.

Yes, it seems to do the trick! I also tuned a handful of other troublesome channels and they sound good too. Hopefully it will survive when I start mythbackend. I've got a recording scheduled at 10pm and I'll be sure to check it soon after it starts.

Thanks,
Helen