What is HDTV?
HDTV short for high definition television is a television display technology that provides picture quality similar to 35 mm. movies with sound quality similar to that of today’s compact disc. Some television stations have begun transmitting HDTV broadcasts to users on a limited number of channels.
HDTV generally uses digital rather than analog signal transmission. However, in Japan, the first analog HDTV program was broadcast on June 3, 1989. The first image to appear was the Statue of Liberty and the New York Harbor. It required a 20 Mhz channel, which is why analog HDTV broadcasting is not feasible in most countries.
HDTV provides a higher quality display with a vertical resolution display from 720p to 1080i. It provides progressive scanning, which means that each scan includes every line for a complete picture, and the i stands for interlaced scanning which means that each scan includes alternate lines for half a picture.
HDTV pixel numbers range from one to two million, compared to SDTV’s range of 300,000 to one million. New television sets will be either HDTV-capable or SDTV-capable, with receivers that can convert the signal to their native display format.