7
6
5
Gain = 1
Amplitude − dB
4
3
Gain = 0.5
2
1
0
Gain = 0
−1
0
1
2
3
4
5
6
7
f − Frequency − MHz
Peak at
f = 2.89 MHz
Gain = 2
Figure 2−15. Peaking Filter Response, PAL Square Pixel Sampling
2.2.3.1 Color Transient Improvement
Color transient improvement (CTI) enhances horizontal color transients by delay modulation for both color difference
signals. The operation must be performed only on YCbCr formatted data. The color difference signal transition points
are maintained, but the edges are enhanced for signals which have bandwidth limited color components (for example,
CVBS and S-video).
2.2.4
Component Video Processor
The component video processing block supports a user-selectable contrast, brightness, and saturation adjustment
in YCbCr output formats. For YCbCr output formats, gain and offset values are applied to the luma data path in order
to map the pixel values to the correct output range (for 10-bit Y
min
= 64 and Y
max
= 940), and to provide a means of
adjusting contrast and brightness. For Y, digital contrast (gain) and brightness (offset) factors can vary from 0 to 255.
The contrast control adjusts the amplitude range of the Y output centered at the midpoint of the output code range.
The limit block limits the output to the ITU-R BT.601 range (Y
min
to Y
max
) or an extended range depending on a user
setting.
Offset
Y
x
+
Limit
Y
Gain
Figure 2−16. Y Component Gain, Offset, Limit
2−8
TI [ TEXAS INSTRUMENTS ]
