Comb Filter

The task of a "Comb Filter" is to remove the residual chrominance (color) of the luminance signal (brightness). The "Comb
Filter" improves the fine detail, clean contours of the images and deletes extraneous colors. Comb filters are designed to clean up any fuzziness or artifacts brought in by the composite signal. Comb filters use various methods to clean up artifacts and therefore vary in effectiveness.

The "Combs Filters" are not required and not used connections with S-video or component video, as these connections transmit
information from separate chrominance and luminance. Good comb filtering enhances fine detail, cleans up image outlines, and
eliminates most extraneous colors. Comb filters do not affect S-Video, component-video or digital-video connections. There
are 4 types of "Comb Filters" on TV today:

• Glass - may also be known as a "Comb Filter" "analog".
• Digital 2 Lines - compares consecutive scanning lines within a field of video and makes adjustments to reduce interference or crossing colors.
• Digital 3-Line - compared to 3 lines of scanning within a field of video. By comparing more image information, the filter of 3 lines greatly reduces the color shift of movedizos and points.
• Digital 3D - not only analyzes consecutive scanning lines within a field, but also analyzes the fields above and below. Results in a high purity of color and a video image more stable, and almost completely eliminates the color shift of movedizos and points. Also called Y / C 3D.