bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 64

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

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2.0 Electrical Interfaces
2.1 Input Interface
2.1.9 2X Oversampling and Input Filtering
Figure 2-5. Luma and Chroma 2x Oversampling Filter
To avoid aliasing artifacts, digitized video needs to be band-limited. Because the
Bt829B samples at CLKx2 (8xFsc—more than twice the normal rate), no filtering
is required at the input to the A/Ds. The analog video needs to be band-limited 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
signal content is expected above these frequencies, the optional antialiasing filter
shown in Figure 2-1 may be included in the input signal path. After digitization,
the samples are digitally low-pass filtered and then decimated to CLKx1. The
response of the digital low-pass filter is shown in Figure 2-5. The digital low-pass
filter provides the digital bandwidth reduction to limit the video to 6 MHz.
NTSC
PAL/SECAM
D829BDSA
VideoStream II Decoders
NTSC
Bt829B/827B
PAL/SECAM