Analogue television uses a 6 MHz signal- carrying intensity and colour information for each scan line of the picture. An analogue signal in the U.S. has 480 scan lines (525 broadcast) in NTSC format and in Europe; the PAL format has 576 visible lines (650 transmitted). This level of resolution was good fifty years ago, but today most electronic technologies have moved to higher-resolution digital. Computer monitors offer resolutions of at least 1280x1024, leaving analogue pale in comparison.
New satellite systems and DVDs that use a digital encoding scheme provide clearer pictures, but this is then converted to analogue to be displayed on most televisions. HDTV is the big push to convert the world of television from analogue to digital in order to forgo this conversion process and use the signals from the DVD, TV signal, Satellite or Internet directly.
5.1 Digital Stereo improves sound quality by using one woofer and five speakers to deliver crystal clear surround sound. HDTV has a high resolution of either 720 or 1080 scan lines. In Europe, the move is towards the scanned 720 lines on the TV. Progressive scanning updates the screen 60 times a minute, whereas the interlaced 1080 line scans cause alternate lines to update 60 times a minute, leading to flickering on large displays.
TV Stations may choose which formats to broadcast. ...Show more