Hi, On Tue, 18 Sep 2007, Wolfgang Wegner wrote: > On Tue, Sep 18, 2007 at 11:35:31PM +0200, Patrick Boettcher wrote: > > > > I don't understand your conclusion. > > sorry, probably my wording was all wrong. > > > Try this doc > > http://www.dvb.org/(RoxenUserID=cc5cd761bc596bbccaf4820a0a017e74)/technology/fact_sheets/WP01_DVB-T%20Hierarchical.pdf > > > > It describes the constellation and the possibilities. > > Thank you for the link! > In fact it shows my thinking was wrong, the wording clearly states "two > completely different services". > >From my digital transmission classes I remembered it was planned to > deliver an SD stream in the HP channel and just the additional data > for HD decoding in the LP stream, such that for HD decoding both streams > would have to be used. Probably that is simply not possible to realize > on the encoding side, because it would be more bandwidth efficient. Oh, have a look at ISDB-T and you will be surprised. In this case the demod has 3 viterbi decoders and 3 fec-engines and (has to/can) combine the output all streams into one TS. Patrick. -- Mail: patrick.boettcher@xxxxxxx WWW: http://www.wi-bw.tfh-wildau.de/~pboettch/ _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
