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.
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- 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.
- digital wallet
(1) Encryption software that works like a physical wallet during electronic commerce transactions. A wallet can hold a user’s payment information, a digital certificate to identify the user, and shipping information to speed transactions. The consumer benefits because his or her information is encrypted against piracy and because some wallets will automatically input shipping information […]
- digital zoom
Digital zoom is a function of a digital camera used to make the image seem more close-up. Digital zoom on a digital camera works the same as cropping and enlarging a photo in a graphics program. This type of zoom will result in a loss of quality and image resolution because the image is simply […]
- digitize
To translate into a digital form. For example, optical scanners digitize images by translating them into bit maps. It is also possible to digitize sound, video, and any type of movement. In all these cases, digitization is performed by sampling at discrete intervals. To digitize sound, for example, a device measures a sound wave’s amplitude […]