SDTV - Computer Definition
A standard for digital television (DTV) that supports display formats that are relatively consistent with legacy analog TV formats with respect to resolution and other specifics. SDTV also is distinguished from high definition television (HDTV). Specifically, SDTV specifies two formats, as detailed in Table S-1. Table S-1: SDTV Scanning Formats
|Vertical Lines||Horizontal Pixels||Aspect Ratio||Refresh Rate (fps)*|
|480||704||4:3, 16:9||24p, 30p, 60p, 60i**|
|480||640||4:3||24p, 30p, 60p, 60i**|
(Standard Definition TV) A set of digital television (DTV) standards with 480 lines of resolution. All SDTV formats are interlaced, and SDTV pictures are not as sharp as progressive scan EDTV or HDTV (Enhanced Definition or High Definition). SDTV Vs. SD "SDTV" may refer to the format or to a TV set that supports it; however, "SD" refers only to the format. See DTV for all the SD/ED/HD specifications. Sometimes, "SDTV" and "SD" are also used to refer to regular NTSC or PAL television because analog TV and SDTV are nearly equivalent in resolution and have the same 4:3 screen aspect ratio (more square). See interlace, HDTV and EDTV.