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): 75/141頁
文件大?。?/td> 1149K
代理商: BT849A
Brooktree
65
E
LECTRICAL
I
NTERFACES
Input Interface
L848A_A
Bt848/848A/849A
Single-Chip Video Capture for PCI
2X Oversampling and
Input Filtering
Digitized video needs to be bandlimited in order to avoid aliasing artifacts. Be-
cause the Bt848 samples the video data at 8xFsc (over twice the normal rate), no
filtering is required at the input to the A/Ds. The analog video needs to be band lim-
ited to 14.32 MHz in NTSC and 17.73 MHz in PAL/SECAM mode. Normal video
signals do not require additional external filtering. However, if noise or other sig-
nal content is expected above these frequencies, the optional anti-aliasing filter
shown in Figure 25 may be included in the input signal path. After digitization, the
samples are digitally low pass filtered and then decimated to 4xFsc. The response
of the digital low pass filter is shown in Figure 27. The digital low pass filter pro-
vides the digital bandwidth reduction to limit the video to 6 MHz.
Figure 27. Luma and Chroma 2x Oversampling Filter
NTSC
PAL/SECAM
NTSC
PAL/SECAM
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