An NTSC video image consists of 525 horizontal lines.
HD-DVD consist of 1080 horizontal lines.
How many horizontal lines an NTSC HD-DVD consists of?!
Same for PAL HD-DVD?!
2006-10-17 17:32:42 · 2 answers · asked by Abady 1 in Consumer Electronics ➔ Home Theater
An NTSC image does not contain 525 lines. That is the total number of horizontal sweeps in one frame (1/30 sec) of an NTSC picture. Not all of those lines get displayed, because time is required to return the electron beam from the bottom of the picture back to the top. This happens twice each frame (because of interlacing--the picture is scanned from top to bottom twice each frame, first the odd lines then the even lines). The scanning doesn't stop during these "retrace" periods, so these scan lines, while counted toward the 525, do not appear in the picture. The net result is that an NTSC picture contains 480 lines, which is the same as standard (non-HD) digital television and standard DVD.
High definition specs for 720p and 1080i specify that these are displayed lines, so HD-DVD will have 1080 lines in the picture.
PAL has 576 visible lines it the picture, but there is no such thing (yet) as PAL HD-DVD. There may be a new European standard for high definition television, but it won't be PAL. PAL (phase-alternalte-line) applies to analog systems only.
2006-10-17 19:53:07 · answer #1 · answered by gp4rts 7 · 0⤊ 0⤋
I believe NTSC and PAL only apply to broadcasting, and therefore HD-DVD should put out 1080 horizontal lines no matter what. Also, remember NTSC and PAL are both SDTV, and HD-DVD is HDTV, so neither NTSC nor PAL should not affect HD-DVD.
2006-10-18 00:57:04 · answer #2 · answered by mysticman44 7 · 0⤊ 0⤋