digital satellite system
Abbreviated DSS, a network of satellites that broadcast digital data. An example of a DSS is DirecTV, which broadcasts digital television signals. DSS’s are expected to become more important as the TV and computer converge into a single medium for information and entertainment.
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- digital photography
Digital photography is the art and science of producing and manipulating digital photographs — photographs that are represented as bit maps. Digital photographs can be produced in a number of ways: Directly with a digital camera By capturing a frame from a video By scanning a conventional photograph Once a photograph is in digital format, […]
- digital signature
A digital code that can be attached to an electronically transmitted message that uniquely identifies the sender. Like a written signature, the purpose of a digital signature is to guarantee that the individual sending the message really is who he or she claims to be. Digital signatures are especially important for electronic commerce and are […]
- digital-to-analog converter
Short for digital-to-analog converter, a device (usually a single chip) that converts digital data into analog signals. Modems require a DAC to convert data to analog signals that can be carried by telephone wires. Video adapters also require DACs, called RAMDACs, to convert digital data to analog signals that the monitor can process.
- digital video
Refers to the capturing, manipulation and storage of video in digital formats. A digital video (DV) camcorder, for example, is a video camera that captures and stores images on a digital medium such as a DAT.
- digital video surveillance system
An appliance that enables embedded image capture capabilities that allows video images or extracted information to be compressed, stored or transmitted over communication networks or digital data link. Digital video surveillance systems are used for any type of monitoring.