Glossary - A Practical Guide to Video and Audio Compression - page 726

Topic Description

DivX A popular standard for compressing video to a reasonably good

quality at low bit rates. A 2-hour movie compresses to a size that
comfortably fits on a CD-ROM. This is derived from the MPEG-
4 standard with some additional enhancements that make it
noncompliant in some minor respects.

DOM Document Object Models are used to describe the content

structure of a Web page, for example.

DPI Dots per inch

DRM Digital Rights Management seeks to control access to content so

that commercial models can be built.

DSat Digital TV broadcast using DVB standards from the head-end,

up to a satellite, and back down to a consumer's receiving dish
aerial.

DSP Digital Signal Processors. These are programmable

microprocessors that are optimized for processing audio and
video.

DTAG Digital Terrestrial Action Group.

DTT Digital TV broadcasting using DVB standards via the terrestrial

broadcast infrastructure that was originally installed to
distribute analog TV services.

DV DV is a standard digital video format used in DVCAM and

DVCPro equipment. This is a transfer codec with various
derivative and related siblings and is often used with FireWire.
DV is used at the low end in TV production but at the high end
of semi-pro and amateur cameras. There are variants for higher-
performance professional use. All DV-based codecs yield good-
quality video. The DV codec is very portable across professional
and amateur systems and virtually all desktop-editing systems
support it. You should avoid recompressing it until you are
ready to convert it to a delivery format.

DV25 Digital video compressed to transfer at 25 Mbps is called DV25.

The compression is slightly lossy but undetectable to the human
eye. This format is used in distribution systems.

DV50 Digital Video transferred at a bit rate of 50 Mbps with such

slight compression as to be almost undetectable with measuring
equipment. This format is used in production systems.

DVB Digital Video Broadcasting. Part of the EBU that standardizes

digital TV systems.