[linux-dvb] improving the quality of DVB signal - PS
mw_phil at yahoo.co.uk
Fri Oct 5 12:37:34 CEST 2007
MikeW <mw_phil <at> yahoo.co.uk> writes:
> <ngocminh_bk_nd <at> yahoo.com> writes:
> >Hi all I have 2 cards DVB-T & DVB-S of TWINHAN but i can't use the
> >kaffeine to watch TV channels because the level of signal approxiate 33%.
> >when i use modules #modprobe : bttv bt878 dst dvb_core dvb-bt8xx
> >the commands
> ># scan asiat3 >channels.conf #szap -c channels.conf bloomberg -r
> ># cat dev/dvb/adapter0/dvr0 > /home/ron/file.ts
> >the signal of file.ts is very bad, not continuous.
> >But when i try these card on Window the signal is good,
> >about 88% How can I improve the signal? please help me. Thank you!
> Are you sure that the two numbers quoted are calculated in the same way ?
> Are they peak or average or windowed-average ?
> Or even refer to the same signal quality indicator ?
> Assuming you are comparing like with like, since some frontends with
> silicon tuners have adaptive/tracking filtering, it's possible that the
> Linux driver does not use the manufacturer's best algorithm for tuning.
The usual signal quality 'number' for DVB is BER (bit error rate),
hence you should check this figure for both your Win and Lin setups.
Lower BER => better signal, it is NOT a percentage.
But there might still be a difference in averaging calculations.
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