HDTV

High-definition television (HDTV) is a digital TV format or system, with roughly twice the vertical and horizontal picture information of today's standard TV.

There are some 18 variations of the specification, but three main HDTV formats are popularly in use today:

(a) 1920 pixels per line and 1080i scan lines per frame.

(b) 1280 pixels per line and 720p scan lines per frame.

c) 1920 pixels per line and 1080p scan lines per frame

HDTV video has a picture aspect ratio of 16:9. HDTV audio is usually 5.1 channel surround sound.