D1

A component digital videotape standard

D2

A composite digital videotape standard

D3

A composite digital videotape standard

D5

A component digital videotape standard

D6

An HDTV component digital videotape standard

DA

Distribution Amplifier

D/A

Digital to Analog Converter

DAC

Digital to Analog Converter

DB

Decibel (a tenth of a bel)

DBS

Direct Broadcast Satellite

DC

Direct Current (i.e. not AC)

DCT

Discrete Cosine Transform (used in compression systems)

DDR

Digital Disk Recorder

DG

Differential Gain

DIVINE

Digital Video Narrowband Emission

D-MAC

Digital Multiplexed Analog Components

DOC

Drop Out Compensator (part of a VTR)

DP

Differential Phase

DPCM

Differential Pulse Code Modulation

DPSK

Differentially coherent Phase-Shift Keying

DQPSK

Differential Quadrature Phase-Shift Keying