參數(shù)資料
型號(hào)： ADV7188
廠商： Analog Devices, Inc.
英文描述： Multiformat SDTV Video Decoder with Fast Switch Overlay Support
中文描述： 標(biāo)清多格式視頻解碼器支持快速開(kāi)關(guān)重疊
文件頁(yè)數(shù)： 35/112頁(yè)
文件大小： 943K
代理商： ADV7188
ADV7188
If color kill is enabled, and if the color carrier of the incoming
video signal is less than the threshold for 128 consecutive video
lines, color processing is switched off (black and white output).
To switch the color processing back on, another 128 consecutive
lines with a color burst greater than the threshold are required.
Rev. 0 | Page 35 of 112
The color kill option works only for input signals with a modu-
lated chroma part. For component input (YPrPb), there is no
color kill.
0—Disables color kill.
1 (default)—Enables color kill.
CKILLTHR[2:0] Color Kill Threshold, Address 0x3D [6:4]
The CKILLTHR[2:0] bits allow the user to select a threshold for
the color kill function. The threshold applies only to QAM-
based (NTSC and PAL) or FM-modulated (SECAM) video
standards.
To enable the color kill function, the CKE bit must be set. For
settings 000, 001, 010, and 011, chroma demodulation inside
the ADV7188 may not work satisfactorily for poor input video
signals.
Table 48. CKILLTHR Function
CKILLTHR[2:0]
SECAM
000
No color kill
001
Kill at < 5%
010
Kill at < 7%
011
Kill at < 8%
100 (default)
Kill at < 9.5%
101
Kill at < 15%
110
Kill at < 32%
111
Reserved for ADI internal use only; do not
select
CHROMA TRANSIENT IMPROVEMENT (CTI)
The signal bandwidth allocated for chroma is typically much
smaller than that of luminance. In the past, this was a valid way
to fit a color video signal into a given overall bandwidth because
the human eye is less sensitive to chrominance than to
luminance.
Description
NTSC, PAL
Kill at < 0.5%
Kill at < 1.5%
Kill at < 2.5%
Kill at < 4.0%
Kill at < 8.5%
Kill at < 16.0%
Kill at < 32.0%.
The uneven bandwidth, however, may lead to visual artifacts in
sharp color transitions. At the border of two bars of color, both
components (luma and chroma) change at the same time (see
Figure 22).
Due to the higher bandwidth, the signal transition of the luma
component is usually much sharper than that of the chroma
component. The color edge is not sharp but blurred, in the
worst case over several pixels.
0
SILUMA
DEMODULATED
CHROMA
SIGNAL
LUMA SIGNAL WITH A
TRANSITION, ACCOMPANIED
BY A CHROMA TRANSITION
ORIGINAL, "SLOW" CHROMA
TRANSITION PRIOR TO CTI
SHARPENED CHROMA
TRANSITION AT THE
OUTPUT OF CTI
Figure 22. CTI Luma/Chroma Transition
The CTI block examines the input video data. It detects
transitions of chroma, and can be programmed to steepen the
chroma edges in an attempt to artificially restore lost color
bandwidth. However, it operates only on edges above a certain
threshold to ensure that noise is not emphasized. Care has also
been taken to avoid edge ringing and undesirable saturation
and hue distortion.
Chroma transient improvements are needed primarily for
signals that experienced severe chroma bandwidth limitations.
For those types of signals, it is strongly recommended to enable
the CTI block via CTI_EN.
CTI_EN Chroma Transient Improvement Enable,
Address 0x4D [0]
0—Disables the CTI block.
1 (default)—Enables the CTI block.
CTI_AB_EN Chroma Transient Improvement
Alpha Blend Enable, Address 0x4D [1]
This bit enables an alpha-blend function, which mixes the
transient improved chroma with the original signal. The
sharpness of the alpha blending can be configured via the
CTI_AB[1:0] bits. For the alpha blender to be active, the CTI
block must be enabled via the CTI_EN bit.
0—Disables the CTI alpha blender.
1 (default)—Enables the CTI alpha blender.
CTI_AB[1:0] Chroma Transient Improvement Alpha Blend,
Address 0x4D [3:2]
This controls the behavior of alpha-blend circuitry that mixes
the sharpened chroma signal with the original one. It thereby
controls the visual impact of CTI on the output data.
For CTI_AB[1:0] to become active, the CTI block must be
enabled via the CTI_EN bit, and the alpha blender must be
switched on via CTI_AB_EN.
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