SDA9280 Datasheet, PDF (15/43 Pages) Siemens Semiconductor Group – ICs for Consumer Electronics

SDA 9280 B22
UIN
LPU
First
Derivative
VIN
LPV
First
Derivative
Threshold WIDTH
Detection
THRESH
LPUV
Second
Derivative
Zero ^POS Width
Transition
Control
Insertion
of Steep
Transition
UOUT
VOUT
TRAWID
UES10248
Figure 5
Digital Color Transient Improvement
2.5 Picture Manipulations
A graphic display effect is realized by programmable reduction of amplitude resolution
(Ι²C signals: YGR, YGRRES, CGR, CGRRES). A resolution of 1 to 4 bits is available. A
special characteristic avoids a reduction of picture brightness and color saturation.
The inverted display mode is attained by a programmable bit inversion for each signal
component (Ι²C signals: YINV, UINV, VINV).
Multiple combinations of both manipulations supply very amazing effects on the display.
2.6 16:9-Operation, Signal Compander
The compander enables a display with correct geometric proportions of 4:3 signals on
16:9-screens or 16:9-signals on 4:3-screens. A full screen display of 4:3-letterbox
signals on 16:9-screens is also practicable. Having a full screen display of such signals
on 4:3-screens only a part of the picture can be shown. In this operation mode a
horizontal shift of the picture part used for display is programmable (Ι²C signal: READD).
Expansion in vertical direction must be realized by manipulation of the vertical deflection
current.
To satisfy all these demands a horizontal compression or expansion of the video signals
is performed by raising or reducing the sample frequency. The data are written into a
memory using the system clock CLL and read with a clock of higher or lower frequency.
Semiconductor Group
15
1998-02-01