29
Explanation for circuit operation
When PIP function is executed in ‘different application mode’ signal processing VSP9407B,
the video signal corresponding to a sub screen (Sub CVBS from TU702) is input.
VSP9407B performs a scan rate conversion of main video signal and sub video signal from
480I to 480P, overlaps the main video and sub video to convert to PIP screen and outputs
them to IC201 (CXA2101Q) in YcbCr-H-V format. And, a multi component processor,
IC210 performs a final switching for YcbCr-H-V signal of VSP9407B and YUV (480P,
10801) signal from IA05.
3) Video signal processing
CXA2101 IC can switch OSD by 4 pairs of YUV input and RGB OSD input and react two
kinds of color difference signals of NTSC (YUV) and HD (YpbPr) by YUV to RCB matrix
switch function. It can also control ABL/ACL gain and start level by contrast, brightness,
sharpness, color, tint (Hue) control function and ABL/ACL input terminal. And, it performs
black/white gradation correction and has a voltage input terminal for DC play ratio control.
CXA2101 performs LTI (Luminance Signal Edge Enhancement Setting) and CTI (Color
Difference Signal Edge Enhancement Setting), and generates a signal for VM.
CXA2101 (IC201) performs a final signal processing after switching YCbCr (480P) signal
from VSP9407B and YUV (480P, 1080I) from CXA2151 and outputs the RGB signal
controlled by user control to CRT drive part after mixing it with OSD signal.
5. Sound
5-1 Switching part
For NTSC TV input, SIF signal from main tuner is input to IC602 (MSP3421) PIN67, and 3
pairs of external inputs, audio signals are switched in IA01, output to #32 (R), #33(L) and
input to IC601 #47 (Main L), #48 (Main R).
For audio signals of component 1,2 (DTV, DVD compatible) input, component 1 is input to
#50 (L), #51 (R) and component 2 is input to #53(L), #54(R).
