Sony DVBK-2000 - Manual (Page 35)

Technical information (continued)
In 625/50 system (PAL, DVBK-2000E)
The number of pbcels in the image differ for DV
equipment, IBM PC/AT (or compatibles) and
Macintosh, but the screen ratio is the same 4:3.
• DV format video: 720 x 576 pixels
• IBM PC/AT (VGA mode), Macintosh (13-inch
mode): 768 x 576 pixels
The reason why DV format has less pixels in the
horizontal direction is that each pixel in DV format is
rectangular; wider than it is taller.
However, since pixels on the PC are square, the image
is insufficient in number of horizontal pixels when the
DV software decodes and displays thé image. To
prevent this, DV software converts the number of the
pixels in the horizontal direction from 720 to 768
before it decodes and displays the image.
The horizontal pixel number is
insufficient without conversion.
The image in DV format
(Rectangular pixels)
(Viewer converts the number of
pixels in the horizontal
direction.)
When you capture a picture record'
in wide mode
In 525/60 system (NTSC, DVBK-2000)
The DV format video equipment records a wide
picture at 720 x 480 pixels by compressing the 16:‘
ratio image in the horizontal direction.
The DV software decodes this image after expand
the compressed image so that the DV software
displays the image at 852'x 480 pixels.
In 625/50 system (PAL, DVBK-2000E)
The DV software video equipment records a wide
picture at 720 x 576 pixels by compressing the 16:“?
ratio image in the horizontal direction.
The DV software decodes this image after expand
the compressed image so that the DV software
displays the image at 1024 x 576 pixels.
The clear frame filter
A TV image on the screen is refreshed at a rate of,
times (NTSC) or 25 times (PAL) per second. Howt
the whole image is not refreshed at a time. Usualh
there are two passes over the screen and every otb
line is painted at first time and then the rest of lint
are painted. This means that an image consisting c
every other lines is refreshed at a rate of 60 times
(NTSC) or 50 times (PAL) per second. (Interlacing
The DV software imports an image (frame image)
rate of 30 times (NTSC) or 25 times (PAL) per sect
When the successive images change drastically, th
may be a mismatch between the two images (field
image) of a rate of 60 times (NTSC) or 50 times (P/
per second, resulting in an screen image with jagg
The clear frame filter corrects the jaggies.
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