Re: [Bdadev-discuss] Webpage and binary driver

[Robert S. <rob...@gm...>]

From: "Jani Alanen" <ja...@ka...>
> On Thu, 1 May 2003, Robert Schlabbach wrote:
> > 1. Carrier frequency
> > 2. Inner FEC rate (e.g. 2/3)
> > 3. Modulation type (e.g. QAM-64)
> > 4. Channel bandwidth (e.g. 8MHz)
> > 5. Guard interval (e.g. 1/32)
> > 6. Transmission mode (e.g. 2K)
>
> Does the Technotrend's software give all that information?

No, but the magic of the Internet. Once again, thanks to the Linux
community:

http://nrg.joroinen.fi/dvb-minihowto/conf.html#AEN127

In section 5.3. we find:

2. Inner FEC rate = 2/3
3. Modulation type = QAM-64
4. Channel bandwidth = 8 MHz
5. Guard interval = 1/8 (!!!!!!)
6. Transmission mode = 8K (!!!!!!!!)

Note 5. and 6. - this means you will have to MODIFY and RECOMPILE the
driver, because these parameters are different for the UK (which uses 1/32
and 2K), and these two parameter can *NOT* be autodetected by TPS, because
they influence how the TPS is transmitted, i.e. if these are wrong, the
demodulator will never get the get the TPS data with the reception
parameters.

Now you may ask why it's not sufficient if I set these parameters in my
app - and the answer is yet another bug in the BDA: It does not pass down
*ANY* DVB-T specific parameters to the driver! Thus, the driver must be
HARDCODED for each area which has different settings for these two
parameters.


Now, to the carrier frequency. Please go here:

http://www.digita.fi/english/digita_alasivu.asp?path=1841;2080;2130;2132

Which of these stations are you getting your signal from? BTW, good to see
that Finland is sticking to the standard European UHF channels and not
using those twisted frequencies that the UK does. :)

> > > Currently he transmission area covers over 70 % of the Finnish
> > > households. There are 9 national digital channels.
>
> The transmission coverage doesn't mean that there's DVB-T receivers in
> every household. At the moment, only about 50 thousand receivers has been
> sold to customers, so percentually that's quite small number of people
> who can actually watch DVB-T broadcasts. :)

Well, here in Germany, only the Berlin area has been officially switched
over to DVB-T, with only about 125.000 _potential_ users. I suppose the
number of actual DVB-T users is significantly less...

Regards,
--
Robert Schlabbach
e-mail: rob...@gm...
Berlin, Germany