SDA9489X Datasheet, PDF (15/102 Pages) List of Unclassifed Manufacturers – PIP IV Advanced SOPHISTICUS High-End Picture-In-Picture ICs

SDA 9489X
SDA 9589X
Preliminary Data Sheet
System Description
CKILL
D1 D0
0
0
0
1
1
1
1
1
X
X
COLON
0
0
0
0
1
color killed at damping of
30 dB
18 dB
24 dB
color always off
color always on
Table 4-4 Color-killer adjustment
The bandwidth of the chroma filter is adjustable via CHRBW. The bandwidth depends
on whether the decoder is in SECAM operation or not. A change in CHRBW does not
result in a chrominance position shift on the screen.
CKSTAT can be read out and gives information whether the color is switched on or off.
STDET indicates the detected color standard. Additionally PALID signals whether a PAL
signal or a NTSC signal is applied.
4.4
Comb Filtering
Depending on the selected picture size and color standard, a comb filtering is performed
for luminance and chrominance. A comb filter uses the spectral interleaving of the
encoded luminance and chrominance to separate both without cross artifacts. Thus
cross-color and cross-luminance are suppressed effectively. For NTSC sources, a comb
filtering is performed for all picture sizes. Due to reduced bandwidth in horizontal and
vertical direction a strong reduction of cross artifacts can be achieved for PAL signals.
The same applies for the luminance signal of SECAM signals.
4.5
Luminance Processing
The A/D-converted CVBS (or Y) signal is digitally clamped to back porch. Depending on
the transmitted standard and operational area, an offset between black- and blanking
level can be found in the incoming signal (’7.5 IRE’). As for some applications a black
offset is not desired, controlling may be done using LMOFST. The positive or negative
offset is added to the Y signal before scaling.
Micronas
4-15