[linux-dvb] [PATCH] AverMedia AverTV DVB-T 761

Johannes Stezenbach js at linuxtv.org
Mon Sep 19 12:40:09 CEST 2005


On Tue, Sep 13, 2005 Joe Orton wrote:
> On Sat, Sep 10, 2005 at 06:57:02PM +0200, Johannes Stezenbach wrote:
> > Hm, that's not the real fix, there seems to be another bug.
> > Can you try the following patch:
> 
> I had a play with this since I also see poor quality with my 761 card, 
> trying cpump values of 1, 2 and 3 for the 470..750Mhz range with your 
> patch to also do cpump << 6.
> 
> I ran tzap for 60 seconds on a mux at 665Mhz and recorded all the ber 
> values, extracted into a spreadsheet:
> 
> cpump	1	2	3
> average	13804	6071	5365
> median	9618	5494	4758
> 
> which is still not exactly great but it seems cpump=3 gives the best 
> results; I'll do some more testing with this patched driver and report 
> back later in the week.  If there's anything else it would be useful to 
> test let me know.

I committed my patch now unchanged. The cpump=1 value from the
Windows i2c dump was apparently wrong, 2 vs. 3 doesn't seem to make
that much of a difference so I'd rather not mess with it.

Johannes



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