Digital Signal Processing (Tuner Box) - Panasonic TC-P54Z1 Technical Manual

Digital Signal Processing (Tuner Box)

Circuit Explanation
The main function of the A board is to select and process one of the incoming video signals. Video inputs 1
and 2, Component Video Inputs 1 and 2, PC input, and the composite video output of the tuner are all
connected to IC3001 for selection. The video output signal of the switch can be in any of the three formats:
Video, Y/C, or Y, Pb, Pr. The selected output enters IC4510 (HDMI I/F Receiver/ Sound Processor).
A comb filter inside IC4510 converts the composite video signal of the main picture to Y and C (luminance
and chrominance) signals. S-Video, which is already Y/C separated, simply passes through the comb filter.
At the completion of this process, the format of the composite or S-Video signal is now the same as a digital
480i component signal. If the incoming video is in the 480p, 720P, or 1080i format, the Y, Pb, and Pr signals
undergo A/D (analog to digital) conversion only. The 10 bit YUV data is provided to a video switch inside
IC4510.
The HDMI signal from the HDMI ports is connected to IC4510 for selection.
The HDMI receiver section of IC4510 converts the incoming HDMI signals to a YUV video signal. The 36 bit
RGB digital video signal is provided to the PEAKS AVC IC, IC5100.
Digital television reception of the tuner is output in the form of an IF (Intermediate Frequency) signal.
The transport stream from the tuner enters the VSB I/F (Interface) section of IC8001 where the video signal is
extracted and converted to YUV data. The JPEG data of the SD card enters the JPEG I/F section of IC8001
for conversion into YUV data.
The PCI bus I/F signal is also connected to IC8001 for processing.
The selected picture data is then converted to LVDS signal and is then outputted to IC5100 (Global Core 6).
OSD from IC8001 is mixed with the video signal inside IC5100.
The LVDS output from IC 5100 is provided to the DH board (HDMI Out). Here the audio signal from IC4510 is
introduced to the LVDS transmitter circuit.
TMDS Data Clock, DDC IIC, and HDMI CEC from the LVDS transmitter circuit are provided to the Display
unit through the HDMI cable.
Slide #27