CXA2101AQ
2. YCbCr switching circuit
In the IN1/SELIN switching circuit, the inputs of the IN1 system (Pins 67, 68 and 69) and SELIN system (Pins
76, 77 and 78) are switched by YCBCR/MAT (I2C bus).
In the INT/EXT switching circuit, the IN1/SEL switching circuit output and EXTIN (Pins 62, 63, and 64) system
input are switched by YCBCR-SW (Pin 61).
In the respective color difference input circuits for INT and EXT, adjustment is enabled by CB OFFSET 1, CR
OFFSET 1 (I2C bus), etc. in order to reduce the color leakage resulting from DC offset between CbCr under
no-input conditions. The register is made effective by a factory setting.
3. Y system signal processing
The Y signal passes through the sub-contrast control, sharpness control, LTI (luminance transient
improvement), clamp, DC transmission ratio compensation and black expansion circuits, and is output to
MATRIX/CLP.
f0 for the sharpness, LTI, VM, etc. is set to the optimum value for each TV system (normal, FF, HD) by
SYSTEM (I2C bus). It can be set to any value by the I2C bus when various effects are to be changed.
The differential waveform of the Y signal is output to VM-OUT (Pin 59). The VM-OUT phase is about 60ns
ahead of the R-OUT signal phase, and it can be finely adjusted by VMDEL (I2C bus). VM-OUT can be muted
by the YS/YM-1, YS/YM-2 and VM/SHP/C-OFF pins.
The sharpness can be turned off simultaneously at the VM/SHP/C-OFF pin. Refer to the Pin Description.
LTI provides aperture correction by creating compensation signals in the rise and fall parts of the color
difference signals and by adding these signals to the original signals.
This IC comes with aging modes. The AGING1 mode (all white output) and AGING2 mode (all black output)
can be set by the I2C bus. When PURE-RGB (from the matrix selector), LRGB1 and LRGB2 have been
selected, the aging mode is canceled since the output of these inputs takes priority.
4. Color difference (CbCr) system signal processing
Color difference signals CbCr pass through the sub-color control, CTI (chrominance transient improvement),
hue control, color control and detection axis setting circuits, and are output to MATRIX/CLP.
f0 for CTI is set to the optimum value for each TV system (normal, FF, HD) by SYSTEM (I2C bus). CTI provides
aperture correction by creating compensation signals in the rise and fall parts of the color difference signals
and by adding these signals to the original signals.
In the color gain control amplifier, the color off mode is fully established when the COLOR (I2C bus) data is set
to 00h. The color can also be turned off at VM/SHP/C-OFF (Pin 60). Refer to the Pin Description.
Next, in the detection axis setting circuit, the R-Y axis and G-Y axis components are set by fixing the B-Y axis.
After conversion into the respective color difference signals, the signals are input to the MATRIX/CLP circuit
along with the Y signal to form the RGB primary colors.
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SONY [ SONY CORPORATION ]
