High-Definition

In digital terms, amounts of digital data (information) are used to convey images and sounds. Definition increases as more information is provided. In a digital camera, for example, a still picture taken at VGA resolution is not considered high definition at a resolution of 640 times 480. 1280x1024 is more acceptable although most cameras approach approximately 2500x2000 resolutions. In TV, NTSC delivers about 350x240 resolution, NTSC with progressive scan might be closer to 640x480. HDTV (high definition TV), however is defined upwards of about 1200x720 resolution. Higher resolutions mean more information and that could be defined as more color, more visual detail, higher contrast. Similar rules apply for sound. High Definition Radio allows more information to be placed on its bandwidth and that upgrades the overall fidelity, clarity, and accuracy of the sound. Home Theater surround sound used digital technology to address 5 or more channels of audio information to enable surround sound encoding on a soundtrack