2008-12-05, 14:02
azido Wrote:this might be a silly question, but:I don't know how many modern TVs' support true 24hz but for my recently bought plasma (Panasonic TH-50PX8) they made a marketing thing of it supporting 24hz-material. It's a 100Hz-tv which switches to 96Hz (24x4) when it is fed with a 24Hz-signal.
how can i find out which refresh rates my tv supports? shouldn't every tv be able to use 24hz? it's an "orion" hd-ready tv with a max resolution of 1366x768 (720p/1080i max)
From wikipedia (article "HDTV blur"):
One possible advantage of a 100 Hz + display is superior conversion of the standard 24frame/s film speed. Usually movies and other film sources in NTSC are converted for home viewing using what is called 3:2 pulldown which uses 4 frames from the original to create 5 (interlaced) frames in the output. As a result 3:2 pulldown shows odd frames for 50 milliseconds and even frames for 33 milliseconds. At 120 Hz 5:5 pulldown from 24frame/s video is possible[14] meaning all frames are on screen for the same 42 milliseconds. This eliminates the jerky effect associated with 3:2 pulldown called telecine judder. However, to use 5:5 pulldown instead of the normal 3:2 pulldown requires either support for 24 frame/s output like 1080p/24 from the DVD/HD DVD/Blu-ray Disc player or the use of reverse telecine to remove the standard 3:2 pulldown. Some TVs (particularly plasma models) do 3:3 pulldown at 72 Hz or 4:4 at 96 Hz.[15] (for specific models, see list of displays that support pulldown at multiples of the original frame rate.) PAL countries speed the 24 fps film speed by 4% to obtain 25 fps, therefore movies in the PAL format are completely free of Telecine judder effects. As a result, 100 Hz televisions do not suffer from telecine judder as 120 Hz models do.