Video Asylum

Posted by GL (i) on February 05, 2001 at 02:11:35:

In Reply to: Re: comb filter posted by kj on February 05, 2001 at 00:53:22:

A 3 line comb filter is not the same as a 3D Y/C (Y=Luminance C=Chrominance)comb filter.

The link below explains all of the different comb filters, it is technical but has lots of useful information which would help you decipher manufacturers' specs for their TV's.

Genuine 3D digital comb filters offer the best performance currently available.

Here is a summary of the performance of the various filters with test signals:

Technology What to Look For :
Simple Analog Filters:
Limited luminance and color resolution. Cross color effects when observing higher frequencies in the multiburst pattern, AVS frame 50816.
Analog Line Comb Filters, Glass or CCD:
Problems listed above are corrected. Hanging dots appear on the horizontal borders between vertical color transitions at the base of the SMPTE color bars, AVS Frame 50815. Dots along the vertical edges of the color bars are present.
Digital 2-D Adaptive Y/C Separation Filter:
The 'hanging dots' at the base of the SMPTE color bars are eliminated. The dots on the vertical edges of the color bars remain. Cross-color effects will still be seen on closely spaced diagonal lines, AVS Frame 50828. Cross-luminance dots in the background of Frames 13710-13740 will be improved over the analog line comb filters.
Digital 2-D Adaptive Y/C Separation Filter:
Enhanced 'Mitsubishi' Type This version of the 2-D Adaptive Y/C Filter will eliminate the hanging dots on the vertical edges of the color bars, AVS Frame 50815
Digital 3-D Motion Adaptive Y/C Separation Filter:
No cross-luminance or cross-color effects should be seen on static (not still) images. Dot crawl should be eliminated in the blue triangle on AVS frames 18612-18770 in play mode.

• Comb Filters explained