There are 12 names in this directory beginning with the letter D.
Digital
- In communications and computer technology, digital refers to a method of encoding information using a binary system made up of zeroes and ones. In communications technology this takes the form of two very different electrical voltages, several volts positive and negative, to represent the two values. This substantial difference in voltages for each state makes it unlikely that minor fluctuations in voltage due to electro-magnetic interference will change the way a signal is interpreted when received.
- Information that is encoded into bits and bytes, or packets (0s and 1s, computer binary language). Generally perceived to be an advanced communication form offering clearer signals and increased transmission capacity.
Downlink
Signal path from satellite to earth, the opposite of earth-to-satellite uplink; downlinked signals are diffused and weak on approach to earth station receivers, and hence easily displaced by terrestrial WiMAX signals which are several thousand times stronger.
DRAM
Dynamic Random Access Memory. Computer memory that requires power to maintain the stored information.
DRM
Digital rights management - a systematic approach to copyright protection for digital media. DRM's purpose is to prevent illegal distribution of paid content over the Internet.
DSL
Digital Subscriber Line - Generic term for technologies that permit the delivery of broadband services over voice telephony networks.
DTH
Direct-To-Home - Typically refers to satellite TV broadcasting directly to a dish antenna on the roof of a house.
DTV-Digital TV
General term for TV services that are transmitted into the home digitally, where they are received either by a set-top box decoder, which converts them into analogue form for display on a conventional analogue TV set, or by an integrated digital TV receiver.
DVB
Digital Video Broadcasting - Collection of open standards for digital television maintained by the DVB Project. The family of DVB standards includes DVB-S (satellite), DVB (cable) DVB-T (terrestrial) and DVB-H (mobile handsets). DVB standards also cover conditional access (DVB-CA), software platforms for consumer video applications (DVB-MHP) and return channels.
DVB-H
Digital Video Broadcasting (DVB), is a suite of internationally accepted open standards for digital television. H stands for handheld.