BT848 ETC, BT848 Datasheet - Page 30

• Manufacturer Part Number: BT848
• Description: Single-Chip Video Capture for PCI
• Manufacturer: ETC

F
Y/C Separation and Chroma Demodulation
Figure 6. Y/C Separation Filter Responses
Figure 7. Filtering and Scaling
20
UNCTIONAL
Note: Z–1 refers to a pixel delay in the horizontal direction, and a line delay in the vertical direction. The coefficients
C
Y
are determined by UltraLock and the scaling algorithm
Luminance
D
ESCRIPTION
Horizontal
Low Pass
Optional
Luma Notch Filter Frequency Responses for NTSC and PAL/SECAM
3 MHz
Filter
Chrominance
=
A
Horizontal Scaler
+
BZ
–
NTSC
1
+
CZ
Luminance
–
=
6 Tap, 32 Phase
2 Tap, 32 Phase
2
G
Interpolation
Interpolation
+
Horizontal
Horizontal
+
DZ
Scaling
Scaling
PAL/SECAM
HZ
and
and
–
3
–
1
+
EZ
Vertical Filter Options
=
=
=
=
–
4
----- - 1
16
1
-- - 1
8
1
-- - 1
4
1
-- - 1
2
1
+
FZ
+
+
+
–
+
5
2
3
z
L848A_A
4
Z
Z
–
Z
1
–
–
1
1
–
1
+
+
+
On-chip Memory
On-chip Memory
Chroma Band Pass Filter Frequency Responses for NTSC and PAL/SECAM
3
1
6
Z
Z
–
Z
–
2
2
–
2
+
Chrominance
+
Luminance
1
4
Z
–
Z
3
–
3
+
Z
Vertical Scaler
–
4
NTSC
=
=
C
1
-- -
2
+
Vertical Scaling
Chroma Comb
Vertical Filtering
Vertical Scaling
+
DZ
Luma Comb
Single-Chip Video Capture for PCI
1
-- - Z
2
–
and
1
–
1
PAL/SECAM
(Chroma Comb)
Bt848/848A/849A
Brooktree
Y
C
®