DAB
Digital Audio
Broadcasting: Along with the revolution in digital TV
comes the revolution in digital radio. Although still in
its infancy, digital radio will end hissing, sweeping
and those annoying warbling noises on weak signals or
between stations. The level of signal needed to achieve
a perfect signal on digital radio is far lower so you
can achieve greater audio clarity more of the time.
DAC
Digital to Analogue Converter. Used in CD players and
other digital components to change digitised information
back into an analogue waveform that the amplifier and
speakers can process.
Digital
Any system that represents analogue signals as streams
of numerically encoded data.
Dolby B, C, S & HX PRO
Noise reduction systems used in cassette decks. Dolby HX
Pro isn't noise reduction but serves to improve the high
frequency performance of some tapes.
Dolby Digital
The accepted standard for DVD, offers superior sound and
seperation. Again uses 5 speakers but offers a seperate
sub woofer channel.
Dolby Digital EX
The newest surround sound system. Works as Dolby Digital
above but with an extra channel in the rear.
Dolby Pro Logic
The basic surround sound system takes a properly encoded
stereo signal and converts it to 4 channel surround
sound. Compatible with most sources, the quality is
limited, most notably by a mono, reduced bandwidth
signal to the rear effects speakers.
Dolby Pro Logic II
Like Pro Logic (above), Pro-Logic II turns a properly
encoded 2 channel source into a full blown 5 channel
signal. Improvements over the original Pro-Logic include
better channel seperation and a full bandwidth, stereo
signal to the rear speakers.
DSP
Digital signal
processing refers to various techniques for improving
the accuracy and reliability of digital communications.
The theory behind DSP is quite complex. Basically, DSP
works by clarifying, or standardizing, the levels or
states of a digital signal. A DSP circuit is able to
differentiate between human-made signals, which are
orderly, and noise, which is inherently chaotic.
DTS
Digital Theatre System
is of a
higher
specification than Dolby Digital but not as widely
available.
DTS ES
Rivalling Dolby Digital EX, ES offers an extra rear
centre channel for improved image placement and
definition.
DVB
Digital Video
Broadcasting is a set of standards that define digital
broadcasting using existing satellite, cable, and
terrestrial infrastructures. In the early 1990s,
European broadcasters, consumer equipment manufacturers,
and regulatory bodies formed the European Launching
Group (ELG) to discuss introducing digital television (DTV)
throughout Europe. The ELG realized that mutual respect
and trust had to be established between members later
became the DVB Project. Today, the DVB Project consists
of over 220 organizations in more than 29 countries
worldwide. DVB-compliant digital broadcasting and
equipment is widely available and is distinguished by
the DVB logo.
Dynamics
The dynamic range of a system is the difference between
the quietest and loudest signals it can reproduce.
DVD
Digital Versatile Disk. The most widely known DVD format
is currently DVD-Video, the digital version of VHS, and
designed for storing full-length movies on a single disc
similar in size to a CD.
DVD can gives awesome digital surround sound playback
that's unbelievable and has 540 lines of resolution,
which makes a crisper, sharper image than VHS, which
relies on around 240.
DVD-A
DVD-Audio is a Digital Versatile Disc (DVD) format, developed by Panasonic, that
is specifically designed to hold audio data, and particularly, high-quality
music.The new DVD format is said to provide at least twice the sound quality of
audio CD on disks that can contain up to seven times as much information.
Various types of DVD-A-compatible DVD players are being manufactured, in
addition to the DVD-A players specifically developed for the format.
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