Memorex MVCB1000 User Guide - Page 8

Resolution an interlacing Two of the elements that determine the quality of a TV picture are resolution and interlacing. Resolution: For TV equipment and broadcasts, resolution is defined by the number of horizontal lines displayed to make up each frame of a video image. The more lines of resolution used to draw each frame of video, the more detailed and sharp the picture will be. Standard TV resolution uses 480 horizontal lines to make up each of video. HDTV uses either 720lines, or 1080 lines to make each video frame. Interlacing: When TVs display video, they display a new video frame at a rate that is faster than your eye can see (from 24 to 60 frames per second, depending on the TV and broadcast). Interlacing refers to whether each of those frames contains all of the lines of video for each frame or every other line. Interlaced signals take every other line frame 2 frames of video (each lasting 1/60th of a second), and combine them into one frame lasting 1/30th of a second. In this way, interlacing tricks your eye into thinking it is seeing twice the resolution that is actually being displayed. In non-interlaced video, (referred to as progressive scan video), video frames are displayed every 1/60th of a second containing all of the lines of video information for each frame. The specifications for video resolutions are usually stated by giving the number of horizontal lines, followed by either the letter "i", for interlaced video, or "p" for progressive scan video. The ATSC specification for HDTV broadcasts and equipment requires either 1080i or 720p. While there is some debate as to whether it is better to have more lines that are interlaced that 1080i is highest quality video format. Input formats TV SET-UP BOX is able to receive broadcasts in any of the resolutions mentioned above. It will then do the appropriate conversion from input signal format to general TV display format. The table below details the results you get with each combination of input signal format. Type Aspect Ratio Compression Size Values Frame Rate 1 8 30p 17 H 16 D 1920×1080 24p 30i 1 5 T 60p 14 V 16:9 1280×720 30p 13 24p 1 2 60p 1 1 30p 10 24p 9 8 S 7 D 30i 704×480 60p 30p 6 T 24p 5 V 4:3 30i 4 60p 3 30p 640×480 2 24p 1 30i 8