Hi, Am Mittwoch, den 20.08.2008, 10:07 -0400 schrieb Steven Toth:> Antti Palosaari wrote:> > Thomas Börkel wrote:> >> hermann pitton wrote:> >> Measuring the strength and SNR is not so easy now. My SAT receiver> >> always says strength 70% and SNR 80%. My new Nova S Plus cards always> >> report strength 97% and SNR 99%. Only my TT 1500s reported reasonable> >> numbers like strength 63-80% and SNR 75-90%.> > > > What is the recommended way to report signal strength or SNR by the > > driver? Both of those are 16bit unsigned value. Is it better to scale > > 0-0xffff or return as decibels? If SNR is reported as decibels it will > > look like very small value...> > > > Antti> > May of the drivers I've added recently report their values in db, but I > typically also have one precision point. So I report 20.4 as 204 decimal.> > - Steve> please allow me to abuse the thread a little for some status I seem tohave on saa7134 and DVB-S so far, not going into x264 issues. Can only report for the saa7134 driver and DVB-S and what we have forthe dual triple Medion Quad Creatix/944 and the new single tripleCreatix/CTX948 with tda10086/tda8283 and isl6405 dual. If SNR goes down 50% caused by external influences on some fewtransponders (1 or 2), artifacts will become visible from time to timein the preview. This has effects on the apps trying to keep A/V sync onthe recorded immediately too and can be seen with verbosity enabled forthem in more details. The apps do differ a lot, how well they deal with the mess, but ingeneral without such mess for mpeg2 they have no problems. My external DVB-S receiver is at the very same point with loopthrough tosecond DVB-S connector and to the external receiver of the Medion Quadfrom its first, which really can actively control voltage and tone. It was exactly the other way round, before we had support for theisl6405. Worked fine too. (A new PC had the mobo then upside down on theleft, helped to become aware of the loopthrough ;) Since the external box runs almost without much buffering, one can seemajor glitches there at first and they will happen in the buffers too alittle later on our drivers. This is fully in sync, just that delay. This works very reliable here. However, signal strength and SNR reported differ for the external boxtoo, vista is even worse on BDA drivers and always reports 100% for bothuntil you are really off and then seems to display some fake. Also the late 2006 driver seems to behave exactly like what we have nowon this dual triple Medion Quad. Others did say it is all finepreviously. On the second DVB-S device without i2c-access to the isl6405, poweringit up from the first to 18 Volts and on close disable it works fine.But the attempted voltage/tone switching in between does nothing on thatone. On the late 2007 driver they seem to have given up on the second DVB-Sand nothing at all happens any more. That recent .inf is also onlylisting the first 16be:0007 as DVB-S capable anymore. Since we still have loopthrough by default enabled on the tda8263, it isstill usable so far. For the record, the internal DVB-S loopthrough has some loss for what Ican see, but this does not count for what goes through to an externalreceiver. It was the other way round previously the same. Still no high symbol rates here for testing, but the Oliver/Manu/Hartmutpatch for those is confirmed by others to be well done. Also for the record, it might take years before anyone comes back toit :), the manual DVB-T/TV analog switch distributes the RF signalevenly to both tuners, means works much better than a passive splitter,don't know why. No external LNA found. Likely the assumed slightlybetter splitters are still crap. All in all, much fun on the Quads now. Thanks to everybody involved, especially to Hartmut and of course Andrewpreviously and to all others who paved this road. Cheers,Hermann _______________________________________________linux-dvb mailing listlinux-dvb@xxxxxxxxxxxxxxx://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
