Comb Filters and 3:2 Pulldown

Comb filters are used to get the most out of the resolution of DVDs and other digital sources. They help to correct detail and color loss that occurs when your TV renders the signal onto the screen by layering several versions of the image on top of one another. For a thorough explanation of comb filters, check out TV Comb Filters. The important thing to know about comb filters is that they come in three types:

Two-line comb filterGood
Three-line comb filterBetter
3D YC comb filterBest

Without a comb filter, you will only be seeing about 50 percent of a DVD's total picture quality. The thing to bear in mind is that your DVD player will only benefit from the comb filter if you hook it up to the TV using the composite video or RF connections. If your TV and DVD player support a higher quality connection type like component video or S-video, then a comb filter is unnecessary. It will still help, though, if you've used RF or composite jacks to hook up your digital cable box.

3:2 Pulldown Processing is rapidly becoming a standard in all TVs. It's a great feature that smoothes out pictures by correcting errors in frame rate.

Frame rate is the measurement used to calculate how many individual images are displayed in a second. Think of a flip book: You have several slightly different images, and as you flip through them quickly it appears as if there is a single, moving image. When you see a movie at the theater, the projector is operating like a flip book at a speed of 24 frames per second. The problem is that different formats operate at different frame rates. So when that same film you saw at the theater is transferred to a DVD, the frame rate jumps to roughly 29.8 per second. This can cause distortion in the image.

3:2 Pulldown Processing corrects the flaws that occur when film is transferred to another format. If you’re a film buff, then this is a feature to look for in your next set. For more information on 3:2 Pulldown Processing, including technical details, check out What the Heck is 3:2 Pulldown?.