[linux-dvb] Re: [PATCH] Alternative fix for budget stream problems

[Roberto Deza <rdeza@unav.es>]

Hi all,

At 09:45 05/09/2003 +0200, Alexandre CONRAD wrote:
>> we rigorously tested data throughput using a smartbits network analyzer 
>> against a hardware platform known to suffer corruption and loss.  this 
>> patch achieved data rates in excess of 70Mbps!
>
>Does this works with a Nexus-S Card ? ...

I short words -no-, but can be done :-).

The TechnoTrend "Premium" cards normally don't have wired the MPEG2
demodulator output (raw Transport Stream) to the SAA7146, as it's done on 
the "Budget" cards; to overcome this, I developed the so called "budget
patch", which is a *hardware patch* to add the "budget" functions to a
"premium" card; more detais in [1] and many list msgs from Emard.

After that, TT market the Nexus DVB-S v2.2, which have also the raw_TS
wired to the SAA7146 !!! (I don't have this card, but saw it on a good
picture; Ralph also commented about this). Having one of this cards,
it would be matter of interconnect two pins of the SAA7146 (GPIO3 ->
D1B_VSYNC) and use the code in 'budget-patch.c' of DVB_kernel [2]. On a 
alternate way, on this cards should be possible to mount two SMD IC's
(74HCT4040, LVC74) that do the packet counting and generate a "frame"
signal.

[1] <http://www.linuxtv.org/mailinglists/linux-dvb/2002/12-2002/msg00423.html>
    <http://80.32.210.242/rdeza/Ttf_tsc1.zip>

[2]
<http://linuxtv.org/cgi-bin/cvsweb.cgi/dvb-kernel/linux/drivers/media/dvb/tt
pci/budget-patch.c>


Best regards:
--
Roberto Deza Asensio
Universidad de Navarra
Data Procesing Center
rdeza@unav.es


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