comb filter


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comb filter

[′kōm ‚fil·tər]
(electronics)
A wave filter whose frequency spectrum consists of a number of equispaced elements resembling the teeth of a comb.

comb filter

A bandpass filter used to process audio and video signals by mixing the original with a delayed signal. Comb filters allow selected frequencies to pass while blocking their harmonics and all other frequencies. Their most common application is to sharpen a composite video image by eliminating residual color (chroma) from the brightness (luma) signal that was not entirely filtered out in an earlier stage.

Early analog and two-line digital comb filters mix one line of video with the next. Since color signals are 180 degrees out of phase in alternating lines, the mixing removes most remaining color from the luma. A three-line digital comb filter averages the signal from the line before and after it to obtain a more accurate cancellation. The better a TV's comb filter, the less artifacts in the image (see dot crawl). See composite video.
References in periodicals archive ?
The 1,366 x 768 resolution monitors feature a contrast ratio of 1000:1, a 3D Y/C comb filter and ample inputs including HDMI, component, two composite and a PC input.
The PW60 delivers rich features and performance, including high-quality motion-adaptive deinterlacing with enhanced low-angle processing, frame-rate conversion, advanced 3D noise reduction and a 3D comb filter.
These sets also come equipped with a Digital Comb Filter and offer DivX, WMA, MP3 and JPEG Playback.
The Pearl video decoder includes an adaptive 5-line comb filter and a versatile VBI-data decoder that also includes optimized PAL performance for the European market.
ViewSonic's new LCD TVs provide a wide 170 degree viewing angle with a 16:9 aspect ratio, an ultra-high contrast of 800:1 and a 1366x768 resolution, along with 3D comb filter and 3:2 pull down to ensure vibrant video and sharp data images when using analog inputs.
This single-chip, enhanced LCD TV controller features advanced Faroudja DCDi Cinema(TM) video processing, a worldwide 3D comb filter and an HDMI receiver.
Integrating a proprietary 3D comb filter for both NTSC and PAL as well as a simultaneous 3D noise reduction algorithm, the TW9919 is designed specifically for premium multimedia applications.
He has been awarded numerous patents for groundbreaking technology, including several signal processing architectures, time and color correction systems and a comb filter that has revolutionized the quality of digital video.
FREIBURG, Germany, April 4 /PRNewswire-FirstCall/ -- Optimized for LCD-TV applications, Micronas (SWX Swiss Exchange: MASN, Frankfurt: MNSN, Prime Standard Segment, TecDAX), a leading supplier of innovative application-specific IC system solutions for consumer electronics, today announced a break-through in full-featured LCD-TV solutions; a single-chip TV solution with dedicated features such as 3D comb filter, component input for HDTV signals, and LVDS outputs.
3D digital comb filter for NTSC and PAL; -- Proprietary pixel enhancement technology; -- 3D motion adaptive deinterlacer with film mode detection; and -- Advanced 3D noise reduction.
Starting the line is the new 14DLV75 (14") which features a 4:3 TFT LCD display, 640 x 480 pixel resolution, a ColorStream Pro(R) Component Video input and a 3-line Digital Comb Filter.
Other features include SRS(R) WOW(TM) and Virtual Dolby(R) for unparalleled sound quality, as well as Digital 3DYC Comb Filter, Cinema Mode (3:2 Pull Down), Color Temperature Control, HD Dynamic Contrast, and Movie and Sports modes.