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TW2864D Datasheet(PDF) 17 Page - Renesas Technology Corp

Part # TW2864D
Description  4-Channel Video Decoders and Audio Codecs For Security Applications
PDF  110 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

TW2864D Datasheet(HTML) 17 Page - Renesas Technology Corp

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TW2864
FN7745 Rev. 0.00
Page 17 of 110
September 28, 2012
ACC (AUTOMATIC COLOR GAIN CONTROL)
The Automatic Chroma Gain Control (ACC) compensates for reduced amplitudes caused by high-frequency loss in
video signal. In the NTSC/PAL standard, the color reference signal is the burst on the back porch. It is measured to
control the chroma output gain. The range of ACC control is –6db to +24db.
Chrominance Processing
CHROMINANCE GAIN, OFFSET AND HUE ADJUSTMENT
When decoding NTSC signals, TW2864 can adjust the hue of the chroma signal. The hue is defined as a phase shift of
the subcarrier with respect to the burst. This phase shift of NTSC decoding can be programmed through a control
register. For the PAL standard, the PAL delay line is provided to compensate any hue error; therefore, there is no hue
adjustment available. The color saturation can be adjusted by changing the gain of Cb and Cr signals for all NTSC, PAL
and SECAM formats. The Cb and Cr gain can be adjusted independently for flexibility.
CTI (COLOR TRANSIENT IMPROVEMENT)
The TW2864 provides the Color Transient Improvement function to further enhance the image quality. The CTI
enhance the color edge transient without any overshoot or under-shoot.
0
1
2
3
4
5
6
x 10
6
-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Frequency (Hertz)
Lo
w
Med
High
CBW=0
CBW=3
CBW=1
CBW=2
FIGURE 5. CHROMINANCE LOW-PASS FILTER CURVES



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