參數(shù)資料
型號(hào): BT849A
英文描述: Single-Chip Video Capture for PCI
中文描述: 單芯片的PCI視頻捕捉
文件頁數(shù): 29/141頁
文件大小: 1149K
代理商: BT849A
Brooktree
19
F
UNCTIONAL
D
ESCRIPTION
Y/C Separation and Chroma Demodulation
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
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 7 schematically describes the filtering and scaling operations.
In addition to the Y/C separation and chroma demodulation illustrated in
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.
For S-Video operation, the digitized luma data bypasses the Y/C separation
block completely, and the digitized chrominance is passed directly to the chroma
demodulator.
For monochrome operation, the Y/C separation block is also bypassed, and the
saturation registers (SAT_U and SAT_V) are set to zero.
Figure 5. Y/C Separation and Chroma Demodulation for Composite Video
Notch Filter
Band Pass Filter
Low Pass Filter
Low Pass Filter
sin
cos
Y
U
V
Composite
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