Nominal Analogue Blanking

Bol

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Nominal analog blanking or nominal analogue blanking is the outermost part of the overscan of a standard definition digital television image. It consists of a variable and arbitrary gap of black (or nearly black) pixels at the left and right sides, which correspond to the end and start of the horizontal blanking interval: the front porch at the right side (the end of a line, before the sync pulse), and the back porch at the left side (the start of a line, after the sync pulse and before drawing the next line). Digital television ordinarily contains 720 pixels, but only about 702 (PAL) to 704 (NTSC) of them contain picture signal. The edge may not be clean - some blurring can occur - and the location is arbitrary, since analogue equipment may typically shift the picture sideways in an unexpected amount or direction. Really old analogue equipment can cause the total width of 'active picture' to vary, usually downwards, perhaps to as little as 680.

Amazon

Pagina's: 88, Paperback, Betascript Publishers