等速 50Hz

Creator:	Lianne Wilson
Language pair:	Japanese to English
Discipline:	-
Definition / notes:	The PAL TV standard shows pictures at 25 frames a second, each frame consisting of two fields. Each field has half the full number of lines, odd lines in one and even lines in the other. These fields are transmitted at twice the frame rate, building the full picture by scanning the odd lines then the even lines. So, the field rate is 50 fields per second. This means that the light on the front of your TV screen is flashing on and off 50 times a second, which is 50Hz flicker. A 100Hz TV basically takes each frame, holds it in a digital memory, and displays it twice before moving on to the next. So the flashing happens twice as fast, i.e., 100 fields per second (100Hz).
URL:	-