參數(shù)資料
型號(hào)： EVAL-ADV7189EBM
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder
中文描述： 標(biāo)清多格式視頻解碼器
文件頁(yè)數(shù)： 29/104頁(yè)
文件大?。?/td> 890K
代理商： EVAL-ADV7189EBM
ADV7189
An automatic mode is provided. Here, the ADV7189 evaluates
the quality of the incoming video signal and selects the filter
responses in accordance with the signal quality and video
standard. YFSM, WYSFMOVR, and WYSFM allow the user to
manually override the automatic decisions in part or in full.
Rev. A | Page 29 of 104
The luma shaping filter has three control registers:
YSFM[4:0] allows the user to manually select a shaping
filter mode (applied to all video signals) or to enable an
automatic selection (dependent on video quality and video
standard).
WYSFMOVR allows the user to manually override the
WYSFM decision.
WYSFM[4:0] allows the user to select a different shaping
filter mode for good quality CVBS, component (YPrPb),
and S-VHS (YC) input signals.
In automatic mode, the system preserves the maximum possible
bandwidth for good CVBS sources (since they can successfully
be combed) as well as for luma components of YPrPb and YC
sources, since they need not be combed. For poor quality
signals, the system selects from a set of proprietary shaping
filter responses that complements comb filter operation in order
to reduce visual artifacts.
The decisions of the control logic are shown in Figure 11.
YSFM[4:0] Y Shaping Filter Mode (SDP), Address 0x17, [4:0]
The Y shaping filter mode bits allow the user to select from a
wide range of low-pass and notch filters. When switched in
automatic mode, the filter is selected based on other register
selections (e.g., detected video standard) as well as properties
extracted from the incoming video itself (e.g., quality, time base
stability). The automatic selection always picks the widest
possible bandwidth for the video input encountered.
If the YSFM settings specify a filter (i.e., YSFM is set to
values other than 00000 or 00001), the chosen filter is
applied to all video, regardless of its quality.
In automatic selection mode, the notch filters are only used
for bad quality video signals. For all other video signals,
wide band filters are used.
WYSFMOVR Wideband Y Shaping Filter Override (SDP),
Address 0x18,[7]
Setting the WYSFMOVR bit enables the use of the WYSFM[4:0]
settings for good quality video signals. For more information,
refer to the general discussion of the luma shaping filters in the
Y Shaping Filter section and the flowchart shown in Figure 11.
Table 59.
WYSFMOVR
Description
0
Automatic selection of shaping filter for good
quality video signals.
1*
Enable manual override via WYSFM[4:0].
*Default value.
0
AUTO SELECT LUMA
SHAPING FILTER TO
COMPLEMENT COMB
SET YSFM
YSFM IN AUTO MODE
00000 OR 00001
VIDEO
QUALITY
BAD
GOOD
SELECT WIDEBAND
FILTER AS PER
WYSFM[4:0]
SELECT AUTOMATIC
WIDEBAND FILTER
WYSFMOVR
1
0
USE YSFM SELECTED
FILTER REGARDLESS FOR
GOOD AND BAD VIDEO
YES
NO
Figure 11. YSFM and WYSFM Control Flowchart
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