Saturday, October 23, 2010

Video Knowledge


Digital TV Resolution Standards
The three vertical scan line systems used in digital TV are 480p (480 lines vertically scanned in a progressive fashion), 720p (720 lines vertically scanned in a progressive fashion), and 1080i (1,080 lines scanned in an interlaced fashion).

NTSC is based on a 525-line, 60 fields/30 frames-per-second, at 60Hz system for transmission and display of video images.

PAL is the dominant format in the World for analog television broadcasting and video display and is based on a 625 line, 50 field/25 frames a second, 50HZ system.

Video format with horizontal resolution estimates:

Resolution (vertical, horizontal)
The number of scan lines, or vertical resolution, of NTSC/PAL/SECAM are constant in that all analog video recording and display equipment conforms to the above standards.

However, in addition to vertical scan lines, the amount of dots displayed within each line on the screen contributes to a factor known as horizontal resolution which can vary

-VHS/VHS-C 220 - 240 lines
-S-VHS/S-VHSC 400 lines
-DVD-R/-RW/+R/+RW 250 - 400+ lines (Depends on recording mode and compression used)
-miniDV 400 - 520 lines
-Analog TV Broadcast 330 lines
-Analog Cable TV 330 lines
-Standard Digital Cable
330 - 500 lines (Depends on original source of the signal and compression used in downloading to the cable box)
-Commercial DVD Up to 540 lines
-BETA 250 lines
-8mm 250 - 280 lines
-SuperBETA 270 - 280 lines
-Laserdisc 400 - 425 lines
-Hi8 380 - 440 lines
-Digital 8 400 - 500 lines
-microMV 500 lines
-ED BETA 500 lines

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