[linux-dvb] Fwd: Distorted analog sound when using an HVR-3000

Eduard Huguet eduardhc at gmail.com
Mon Nov 24 17:53:42 CET 2008


I'll give a try on kradio, and let you know any results.
Best regards,
  Eduard


2008/11/24 Darron Broad <darron at kewl.org>

> In message <617be8890811240823x51995503jd1de6337e11bd90 at mail.gmail.com>,
> "Eduard Huguet" wrote:
> >
> >Hi,
>
> lo
>
> >    I've tested you driver compared to the offcial LinuxTV HG tree, and I
> >**think** (can be wrong, though...) that I'm getting "correct" audio when
> >using a higher input volume. I mean, both drivers delivers crackly sound
> >when given a high volume input, but yours seems to hold up a higher volume
> >level before starting to fail.
>
> just to explain what the changes actually do:
>
> the wm8775 in v4l-dvb has a fixed gain which uses a form of AGC
> circuit to center to gain someplace above 0dB. this function is
> fixed.
>
> my changes to not activate that feature and by defailt the gain
> is set to 0dB.
>
> >I hope this means anything to you... :D
>
> sort of yes. before and after I could get distortion in some
> audio passages, however, by utilising v4l2-ctl to set the gain
> to -6dB those passages become clear. this will be input
> dependant. I don't really have a lot of test cases to provide
> you with and haven't done much investigation into the optimum
> setting.
>
> you can test this more easily using the newly working FM
> radio (does it work in the hvr-3000) in kradio which has
> a radio volume control.
>
> cya
>
> --
>
>  // /
> {:)==={ Darron Broad <darron at kewl.org>
>  \\ \
>
>
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