cxa2050s Sony Electronics, cxa2050s Datasheet - Page 38

• Manufacturer Part Number: cxa2050s
• Description: Y/c/rgb/d For Pal/ntsc Color Tvs
• Manufacturer: Sony Electronics

4) 16:9 CRT subtitle-in mode
When CinemaScope size images which have black borders at the top and bottom of the picture are merely
enlarged with the zoom mode in 3) above, subtitles present in the black borders may be lost. Therefore, this
mode is used to super-compress only the subtitle part and reproduce it on the display.
Add the LO-VLIN adjustment to the zoom mode settings for the register settings.
The LO-VLIN register causes only the linearity at the bottom of the picture to deteriorate. Therefore, UP-VLIN
should also be adjusted if the top and bottom of the picture are to be made symmetrical. Since the picture is
compressed vertically, the number of scanning lines exceeds 430 lines.
5) 16:9 CRT V compression mode
This mode is used to reproduce two 4:3 video displays such as for PandP. The V size must be compressed to
67% in order to reproduce two displays on a 16:9 CRT without distortion using 480 scanning lines, and this can
be set by JMPSW. Compression is performed after the AKB reference pulse, so the reference pulse remains in
the overscan position. The V blanking width after the reference pulse becomes larger than normal and can be
varied by the VBLKW register. During this mode, the bottom V blanking width is also expanded to 3H wider
than normal so that the bottom of the picture is not overscanned.
16:9 CRT standard values are used with only the JMPSW setting changed for the register settings.
6) 16:9 CRT wide zoom mode
This mode reproduces 4:3 video software naturally on wide displays by enlarging 4:3 images without other
modification and compressing the parts of the image which protrude from the picture into the top and bottom
parts of the picture. The display enlargement ratio is controlled by V-ASPECT, and the compression ratios at
the top and bottom of the picture are controlled by UP-VLIN and LO-VLIN.
Adjust the following three registers with respect to the 16:9 CRT standard values for the register settings.
7) 4:3 CRT normal mode
This is the standard mode for 4:3 CRTs.
The register settings are the 4:3 CRT standard values.
8) 4:3 CRT V compression mode
This mode is used to reproduce M-N converter output consisting of 16:9 images expanded to a 4:3 aspect ratio
and other squeezed signals without distortion on a 4:3 CRT. The V size must be compressed to 75% in order
to reproduce a 4:3 squeezed signal at a 16:9 aspect ratio without any distortion. Compressing the V size with
the JMPSW register used in mode 5) above, compresses the V size to 67%. Therefore, V-ASPECT is set to
enlarge the V size by 8%. AKB reference pulse handling and V blanking are the same as for mode 5) above.
4:3 CRT standard values are used with the V-ASPECT and JMPSW settings changed for the register settings.
V-ASPECT = 2Fh
V-SCROLL = 1Fh or user control
LO-VLIN
JMPSW = 1
V-ASPECT = Adjustment value
UP-VLIN
LO-VLIN
V-ASPECT = 3Fh
JMPSW
= Adjustment value
= Adjustment value
= 1
= Adjustment value
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CXA2050S