> > > It's only broadcasting HDTV demo loops, though. But in contrast to > > > EURO1080 this service is broadcasting "true" 1080i at 59.94 > > > fields/sec, whereas EURO1080 uses an uncommon 50 fields/sec. > > > > Wouldn't 50 fields/sec simply be the PAL rate? > > Hmm, ok, I can see how stations who have huge archives of PAL material > might want to use 50 fields/sec HDTV for easier conversion. > But EURO1080 > isn't such a station, so I don't see why they chose this. In > fact, most > HDTV material available today will likely be 59,94 fields/sec, so IMHO > EURO1080 made a pretty stupid decision, since they cannot > easily purchase > HDTV shows e.g. from the USA and just broadcast that.
I would say that HDTV isn't limited to any refresh-rate. All devices saying to be HDTV support all HDTV framerates. Similar to current televisions supporting PAL-50&PAL-60 for NTSC emulation. HDTV @ 50Hz is refresh-rate for upscaling easily the old 50Hz material. But tv-sets supports HDTV @ 60/1.001 and HDTV @ 60. It is a shame that ATSC didn't specify 50Hz refresh rates for 720p / 1080i. Now we have to wait and see what kind of standard Europeans make. My studies with HDTV and my beamer shows following formats (Sony beamer supports [EMAIL PROTECTED],60, [EMAIL PROTECTED], [EMAIL PROTECTED],50,60): 720p & 1080i modes run always with 74.25MHz pixel clock (both 'NTSC' and 'PAL' but it is HDTV, a new standard, not those 'old color standards'). Other possible HDTV clocks are 13.500MHz and 27MHz. In 720p mode screen resolurion is 1280x720. Now comes the differences: Line length specified by ATSC (SMPTE 296M) is 1650 pixels for ~60Hz S3 HDTV white paper suggests HDTV @ 50Hz to use 1980 pixel line. Syncs are similar 40/80 pixel syncs (haven't been able to determine which is better). So a lot empty pixels after sync. Screen heigh for both formats are 750 lines with 5 line syncs. Well X11 modelines I am currently testing (not happy with overscan): Based on SMPTE 296M-2001 HDTV-standard for Sony VPL-HS10 by Jori Hämäläinen, www.jori.ws! Modeline "1280x720_60.00" 74.25 1280 1352 1432 1648 720 725 730 750 Modeline "1280x720_50.00" 74.25 1280 1680 1720 1976 720 725 730 750 # 40 pixel sync test Modeline "1280x720_30.00" 74.25 1280 3000 3080 3304 720 725 730 750 Modeline "1280x720_25.00" 74.25 1280 3660 3740 3960 720 725 730 750 Modeline "1280x720_24.00" 74.25 1280 3824 3904 4128 720 725 730 750 Concept image of my project setup is at: http://www.jori.ws/hdtv_htpc/htpc.jpg (Yeah, VGA image is a ATI card, but currently using Nvidia card because ATI has serious problems with DVI-output to my projector). > Aside from that, I don't think there is any digital HDTV > standard with 50 > fields/sec, while the ATSC HDTV standards exist and are well > established. Australian AS4933.1 standard specifies a lot of timings according to Quantumdata papers (why aren't those standards free??) but yet I have to see what timings are the best for my beamer. Best regards, Jori Hämäläinen BTW: Euro1080 shows also shows, see www.euro1080.tv -- Info: To unsubscribe send a mail to [EMAIL PROTECTED] with "unsubscribe linux-dvb" as subject.
