Whats the difference between high-definition TV and digital TV?
Quality aside, DTV programs may be no different in size and shape than those you watched 60 years ago. Standard definition analog TV consisted of 525 lines of information, displayed on a screen with a 4:3 aspect ratio. Standard definition digital TV pictures contain at least 480 x 640 pixels (tiny dots of colored light), which corresponds to roughly the same resolution and aspect ratio. However, high-definition (HD) TV programs are recorded at much better resolution, frequently in wide-screen. For example, most HD televisions can display programs in 1080p format – that’s 1920 x 1080 pixels (a 16:9 wide-screen picture.) Those HD images are noticeably crisper – especially on large screen TVs. In short, DTV improves signal reception, while HD uses richer content to deliver a “home theater” experience.
