bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 29

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

Bt829B/827B
VideoStream II Decoders
Figure 1-6. Filtering and Scaling Operations
Note: Z–1 refers to a pixel delay in the horizontal direction, and a line delay in the vertical direction. The coefficients are de-
C
Y
Luminance
termined by UltraLock and the scaling algorithm.
Horizontal
Low-Pass
Optional
3 MHz
Filter
Chrominance
=
A
+
Horizontal Scaler
BZ
–
1
+
Figure 1-4, the Bt829B also supports chrominance comb filtering as an optional
filtering stage after chroma demodulation. The chroma demodulation generates
baseband I and Q (NTSC) or U and V (PAL/SECAM) color difference signals.
block completely, and the digitized chrominance is passed directly to the chroma
demodulator.
saturation registers (SAT_U and SAT_V) are set to zero.
CZ
Luminance
Figure 1-6 schematically describes the filtering and scaling operations.
In addition to the Y/C separation and chroma demodulation illustrated in
For S-Video operation, the digitized luma data bypasses the Y/C separation
For monochrome operation, the Y/C separation block is also bypassed, and the
–
=
6-Tap, 32-Phase
2-Tap, 32-Phase
2
G
Interpolation
Interpolation
+
Horizontal
Horizontal
+
DZ
Scaling
Scaling
HZ
and
and
–
3
–
1
+
EZ
=
=
=
=
–
Vertical Filter Options
4
----- - 1
16
1
-- - 1
4
1
-- - 1
8
1
-- - 1
2
1
+
FZ
+
+
+
–
+
5
3
2
z
4
Z
Z
–
D829BDSA
Z
1
–
–
1
1
–
1
+
+
+
On-chip Memory
On-chip Memory
1
3
6
Z
Z
Z
–
–
2
2
–
2
Chrominance
+
+
Luminance
1
4
Z
–
Z
3
–
3
1.6 Y/C Separation and Chroma Demodulation
+
Z
–
Vertical Scaler
4
=
=
C
1
-- -
2
+
Vertical Scaling
Chroma Comb
Vertical Filtering
Vertical Scaling
+
DZ
Luma Comb
1
-- - Z
2
1.0 Functional Description
–
and
1
–
1
(Chroma Comb)
Y
C
19