Al 03/10/10 14:53, En/na Luca Olivetti ha escrit:
Hello,
I cannot currently receive dvb-s2 channels, but I'd like to update my
plugin to work more or less correctly with it (even if I only have a
couple of users).
The wikipedia page
http://en.wikipedia.org/wiki/DVB-S2
says that dvb-s2 has 4 possible modulations: QPSK, 8PSK, 16APSK and 32APSK.
Those are defined in s2api, frontend.h, as QPSK, PSK_8, APSK_16 and
APSK_32.
There's also a DQPSK, which I suppose is for directv? (see below).
But in vdr's dvbdevice.c, ModulationValues only maps to strings QPSK,
PSK_8 and APSK_16.
APSK_32 and DQPSK are missing.
I read transponder information from ini files downloadable from
http://www.fastsatfinder.com/transponders.html#transponders-sorted
I examined all files there, and for S2 transponders I found these
definitions:
QPSK (this is easy)
8PSK (supposedly maps to PSK_8)
16APSK (supposedly maps to APSK_16)
DIRECTV (supposedly maps to DQPSK)
so maybe APSK_32 isn't really needed?
To complicate matters further, if I try to edit a channel, vdr offers me
the following modulations: QAM16, QAM32, QAM64, QAM128, QAM256, QPSK,
8PSK, 16APSK, VSB8, VSB16, QAMAUTO,
QAM modes aren't only for cable? What are VSB for?
Bye
--
Luca
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