bt848kpf ETC-unknow, bt848kpf Datasheet - Page 29

• Manufacturer Part Number: bt848kpf
• Description: Single-chip Video Capture For Pci
• Manufacturer: ETC-unknow

Bt848/848A/849A
Single-Chip Video Capture for PCI
Figure 5. Y/C Separation and Chroma Demodulation for Composite Video
Brooktree
Composite
®
Y/C Separation and Chroma Demodulation
Y/C separation and chroma decoding are handled as shown in Figure 5. Bandpass
and notch filters are implemented to separate the composite video stream. The fil-
ter responses are shown in Figure 6. The optional chroma comb filter is imple-
mented in the vertical scaling block. See the Video Scaling, Cropping, and
Temporal Decimation section in this chapter.
Figure 5, the Bt848 also supports chrominance comb filtering as an optional filter-
ing stage after chroma demodulation. The chroma demodulation generates base-
band 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.
Figure 7 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
Band Pass Filter
Notch Filter
L848A_A
cos
sin
Y/C Separation and Chroma Demodulation
Low Pass Filter
Low Pass Filter
F
UNCTIONAL
D
ESCRIPTION
Y
U
V
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