[linux-dvb] stv0297: improvement for qam256 modulated channels

Oliver Endriss o.endriss at gmx.de
Sat Nov 3 13:48:06 CET 2007


e9hack at googlemail.com wrote:
> 2007/10/28, e9hack <e9hack at googlemail.com>:
> >
> > I've seen two different values for the carrier offset on Windows XP for a
> > TT-C2300. Registers 20/21h
> > are programmed with 3c0a or 3ba4 (carrier offset 6763 or 6718). The value
> > depends on the driver
> > revision. On a TT-C1500, this value is 4000 (carrier offset 7209). It may
> > be possible, that the
> > value is calculated from some other values. I know, that the patch has no
> > effect for some testers.
> > This is the first report with a failure. So it isn't possible to add the
> > patch.
> >
> > In my case, I've some channels in the UHF range with a poor signal
> > strength. Without the patch, I
> > got ber ~3500h and unc >10h. With the patch, I get ber ~b00h and unc 0.
> 
> Sorry, 'carrier offset' should be 'initial demodulation frequency'.

What shall we do with this patch?
I think we cannot apply it right now.

@e9hack:
Could it be that the windows driver tries different settings,
and uses the one with the lowest BER?
(Some kind of zig-zag scan for this parameter.)

CU
Oliver

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