[linux-dvb] improving the quality of DVB signal - PS

MikeW 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.
> 
> Regards,
> MikeW
> 

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.

MikeW







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