58 Chapter 4 Working with FormatsDouble clocking• i2x = double-clocked interlace (scene may change between fields) pixels aredouble-clocked for DVI compatibility)Frame rateFrame rate is optional. If no frame rate is given, then the frame rates are assumed.• 24 = 24 Hz• 60 = 60 HzCommon component TV formats• 480pLH Component SDTV signal containing letterboxed 16x9 high-definition content• 480pSH Component SDTV signal containing anamorphically under-sampled 16x9contentComputer display format namesComputer display formats are assumed to use progressive scanning. In computer formatnaming, the first three characters indicate the vendor ID using the EISA ID (for example,IBM, SUN, VSC) or the display type, the next two characters indicate the approximatehorizontal resolution, the next two digits indicate the frame rate (which will be half the fieldrate with interlace scanning), and the final character designates the aperture (used onlywhen the aperture is not A).ExampleVendor ID (EISA)• SMT for VESA (digital) Safe Mode Timing• DMT for VESA Standard Discrete Monitor Timing• GTF for VESA Generalized Timing Format standard• CEA for Consumer Electronics Association• EIA for Electronics Industries Association (CEA)Approximate horizontal resolution examples• 02 for 256 pixels• 09 for 960 pixels
