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Comb filter's?
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Post 1 made on Monday September 4, 2000 at 23:00
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Can someone please explain what exactly a comb filter is. I want to buy a Toshiba 50" tv but it only has a 2 line digital comb filter and i notice most of them have a 3line digital comb filter. I was wondering how inportant this is. I will be watching mostly dvd's. Does it have anything to do with Svideo, Thanks alot Brian
OP | Post 2 made on Tuesday September 5, 2000 at 20:53
Historic Forum Post

NTSC video signals have two components, the chrominance and luminance that are combined when broadcast (to save bandwidth) or using a composite (hence the name) output (to save money) from a source. Chrominance is the color signal but it lacks detail. Luminance is the black and white information in full detail.

These are the exact two components of S-Video. If all sources were S-Video or better (component or RGBHV), you would not need a comb filter in your TV since this input bypasses the TV's internal comb filter. Older TVs used notch filters and bandpass filters. Each gets their name from the way they look when viewed with a scope (looks like a comb standing on edge, the notch filters have a notch missing from the signal).

The quality of the comb filter used is extremely important as it determines the resolution and edge colorization. The current best ones are three line 3D comb filters which are also call "motion adaptive comb filters". Don't confuse 2D as being two lines, the 2D comb filters are all three line and are "adaptive" filters but not "motion adaptive". None of these are perfect and progressive scan digital TV will eliminate the need for these, but in the mean time we have to deal with them for our older sources.

My recommendation? If you don't use laser disc or watch TV from a tuner that outputs composite or has an inferior comb filter.... but have a good DSS/DISH receiver, a S-VHS deck and a good DVD buy the TV you like and fits your budget. If you watch laser discs a lot, then buy a TV with a three line 3D comb filter cause almost all laser disc players suck in this area!

BTW, laser discs are pressed using a composite signal so this is why most manufacturers paid little attention to the S-Video output. In fact, Pioneer Elite got caught simply taking the video at the composite connector and converting it to S-Video, making it one of the worse performers on the S output around! (it was quite good on the composite output).

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