bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 44

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

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1.0 Functional Description
1.9 Bt829B VBI Data Output Interface
1.9.1 Introduction
1.9.2 Overview
1.9 Bt829B VBI Data Output Interface
A frame of video is composed of 525 lines for NSTC and 625 for PAL/SECAM.
Figure 1-16 illustrates an NTSC video frame in which there are a number of dis-
tinct regions. The video image or picture data is contained in the ODD and EVEN
fields within lines 21–262 and lines 283–525, respectively. Each field of video
also contains a region for vertical synchronization (lines 1–9 and 263–272) as
well as a region which can contain non-video ancillary data (lines 10–20 and
273–282). We will refer to these regions which are between the vertical synchro-
nization region and the video picture region as the Vertical Blanking Interval
(VBI) portion of the video signal.
Figure 1-16. Regions of the Video Frame
In the default configuration of the Bt829B, the VBI region of the video signal is
treated the same way as the video image region of the signal. The Bt829B will
decode this signal as if it was video. For example, it will digitize at 8xFsc, deci-
mate/filter to a 4xFsc sample stream, color separate to derive luma and chroma
component information, and interpolate for video synchronization and horizontal
scaling. This process is shown in Figure 1-17.
Figure 1-17. Bt829B YCrCb 4:2:2 Data Path
Composite
Analog
Lines 263–272
Lines 273–282
Lines 283–525
Lines 21–262
Lines 10–20
Lines 1–9
8xFsc
ADC
D829BDSA
Vertical Blanking Interval
Vertical Blanking Interval
Decimation
Video Image Region
Video Image Region
Filter
Separation
4xFsc
Filter
Y/C
VideoStream II Decoders
Interpolation
Synchronization
Synchronization
Filter
Vertical
Region
Vertical
Region
Bt829B/827B
YCrCb
4:2:2