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then converts the digital signal scan format from interlaced to progressive before
sending it back to IC4501. The NR/CTI/DSC circuit reduces noise and improves
the picture quality. The 10 bit signals are then converted to analog R, G, and B
component signals by IC4501, and applied to the RGB amplifier IC4512.
Sub Picture
On the DG- Board, an analog to digital (A/D) converter circuit, located inside the
Sub Global Core IC4502, converts the sub Y, Pb, Pr signals to digital.
The data is then applied to a comb filter where luminance and chrominance are
separated.
IC4502 processes the Sub video data for use in the PIP mode. In this mode, the
main and sub video components are combined into one set of Y, Pb, and Pr
component signals.
The line-doubler, located inside the IC, halves the horizontal line period, doubling
the horizontal frequency to 31.468KHz. Using IC4518 as a temporary storage
area, IC4502 then converts the digital signal scan format from interlaced to
progressive before sending it back to IC4501. The NR/CTI/DSC circuit reduces
noise and improves the picture quality. The 10 bit digital signal is then converted
to analog R, G, and B component signals by IC4501, and applied to the RGB
amplifier IC4512.
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