Digital Processor
Figure 7
Main Picture
On the DG- Board, the main Y, Pb, Pr signals are converted to digital data by an
analog to digital (A/D) converter circuit located inside the Global Core IC, IC4501.
The comb filter in IC4501 converts the composite video signal of the main picture
to Y and C separated video signals. S-Video, which is already Y/C separated,
simply passes through the comb filter. The data is then applied to the Chroma
demodulator circuit that separates the color signal into Pb and Pr data. If the
incoming video is in the 480p and 1080i format, the main Y signal is converted to
digital by IC4515 before being applied to IC4501. The A/D converter inside
IC4501 converts the color signals to digital. The data of the color signals bypass
the comb filter and Chroma demodulator circuits to join up with the luminance
data.
IC4501 outputs the data to the global core IC, IC4502. IC4502 contains a line-
doubling circuit that halves the horizontal line period, doubling the horizontal
frequency to 31.468KHz. Using IC4518 as a temporary storage area, IC4502
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Содержание TH37PA20U - 37" SDTV PLASMA DISPLAY
Страница 2: ...2 ...
Страница 6: ...6 ...
Страница 25: ...SC Board Explanation Figure 12 25 ...
Страница 29: ...Figure 16 29 ...
Страница 56: ...Test Point locations Figure 38 56 ...
Страница 60: ...I2 C Menu Structure The values indicated in this flowchart are sampled data Figure 41 60 ...