Service manual

3D Comb Filter (Diagram CO)
Conventional Comb filters separate the luminance (black and white picture information)
from the chroma (color picture information), by comparing horizontal scanning lines
within one video frame The 3D Digital Comb Filter takes this idea two steps further by
acting upon not only consecutive lines within the frame, but in the frame before and
after as well. The added analysis and correction result in far sharper pictures with less
noise, as well as an enhanced purity of color. The filter also compensates for any
motion that occurs between fields.
The video inputs and outputs are protected from temporary overload conditions and are
ESD protected for improved reliability. The module is controlled via I2C commands.
The red LED on the panel indicates proper sync and color burst timing. When they are
detected, the LED must be 'off.'
The input currents for the 5 V (280 mA) and 9 V (120 mA) supply are self-limiting due to
the use of a PTC (R3103 and R3104).
The 3D Comb filter is integrated in one IC (type uPD64083.) The block diagram of the
3D Comb panel is indicated in the next figure.