generate questions: At a minimum, HDTV has twice the linear resolution of standard-definition television (SDTV), thus showing greater detail than either analog television or regular DVD. The technical standards for broadcasting HDTV also handle the 16:9 aspect ratio images without using letterboxing or anamorphic stretching, thus increasing the effective image resolution.
At least how many times more linear resolution does HDTV have over SDTV? {sep_token} HDTV increases the effective image resolution by not using what? {sep_token} What does SDTV stand for? {sep_token} HDTV handles what aspect ratio without using letterboxing or anamorphic stretching? {sep_token}