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參數(shù)資料
| 型號： | TDA938X |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | TV signal processor-Teletext decoder with embedded m-Controller |
| 中文描述： | 電視信號處理器與嵌入式米圖文電視解碼器控制器 |
| 文件頁數(shù)： | 136/140頁 |
| 文件大?。?/td> | 570K |
| 代理商： | TDA938X |
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1999 Sep 28
136
Philips Semiconductors
Preliminary Device Specification
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA935X/6X/8X series
Adjustment of geometry control parameters
The deflection processor offers 5 control parameters for
picture alignment, viz:
S-correction
vertical amplitude
vertical slope
vertical shift
horizontal shift.
The 110
°
types offer in addition:
EW width
EW parabola width
EW upper/lower corner parabola
EW trapezium correction.
Vertical zoom
Horizontal parallelogram and bow correction for some
versions in the range
It is important to notice that the ICs are designed for use
with a DC-coupled vertical deflection stage. This is the
reason why a vertical linearity alignment is not necessary
(and therefore not available).
For a particular combination of picture tube type, vertical
output stage and EW output stage it is determined which
aretherequired valuesforthesettingsof S-correction, EW
parabola/width ratio and EW corner/parabola ratio. These
parameters can be preset via the I
2
C-bus, and do not need
any additional adjustment. The rest of the parameters are
preset with the mid-value of their control range (i.e. 1FH),
or with the values obtained by previous TV-set
adjustments.
The vertical shift control is meant for compensation of
off setsintheexternalverticaloutputstageorinthepicture
tube. It can be shown that without compensation these
off sets will result in a certain linearity error, especially with
picture tubes that need large S-correction. The total
linearity error is in first order approximation proportional to
the value of the off set, and to the square of the
S-correctionneeded.Thenecessitytousetheverticalshift
alignment depends on the expected off sets in vertical
output stage and picture tube, on the required value of the
S-correction, and on the demands upon vertical linearity.
For adjustment of the vertical shift and vertical slope
independent of each other, a special service blanking
mode can be entered by setting the SBL bit HIGH. In this
mode the RGB-outputs are blanked during the second half
of the picture. There are 2 different methods for alignment
of the picture in vertical direction. Both methods make use
of the service blanking mode.
The first method is recommended for picture tubes that
have a marking for the middle of the screen. With the
vertical shift control the last line of the visible picture is
positioned exactly in the middle of the screen. After this
adjustment the vertical shift should not be changed. The
top of the picture is placed by adjustment of the vertical
amplitude, and the bottom by adjustment of the vertical
slope.
The second method is recommended for picture tubes that
have no marking for the middle of the screen. For this
methodavideosignalisrequiredinwhichthemiddleofthe
picture is indicated (e.g. the white line in the circle test
pattern).Withtheverticalslopecontrolthebeginningofthe
blanking is positioned exactly on the middle of the picture.
Then the top and bottom of the picture are placed
symmetrical with respect to the middle of the screen by
adjustment of the vertical amplitude and vertical shift.
After this adjustment the vertical shift has the right setting
and should not be changed.
If the vertical shift alignment is not required VSH should be
set to its mid-value (i.e. VSH = 1F). Then the top of the
picture is placed by adjustment of the vertical amplitude
and the bottom by adjustment of the vertical slope. After
the vertical picture alignment the picture is positioned in
the horizontal direction by adjustment of the EW width and
the horizontal shift. Finally (if necessary) the left- and
right-hand sides of the picture are aligned in parallel by
adjusting the EW trapezium control.
To obtain the full range of the vertical zoom function the
adjustment of the vertical geometry should be carried out
at a nominal setting of the zoom DAC at position 19 HEX.
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