24093_ADP 303 Eng. 27/02/1998 10:34 Side 3
Introduction and Safety Information
2
UNPACKING & INSTALLATIONWHAT IS DOLBY DIGITAL?and optical movie soundtracks were
limited to two channels. Dolby Surround
The carton and shipping materials usedDolby Digital, or AC-3 as it is often
to protect your new ADP303 duringreferred to, is a totally new generation ofwas the technology that broke the two
shipment were specially designed tomulti-channel digital audio technology.channel barrier, by placing two
cushion it from shock and vibration. WeUsing advanced circuit designs andadditional channels within the left and
suggest that you save the carton andspecially developed compressionright signals.
packing materials for use in shipping iftechniques, AC-3 delivers significantThose two additional channels presented
you move or should the unit ever needadvances over previous multi-channelcenter channel information, primarily
repair.systems: it delivers noise free, widefor movie dialog, and a single, mono
bandwidth sound and it includes sixrear channel for effects. The
To minimize the size of the carton inseparate audio channels. combination of these two channels with
storage, you may wish to flatten it. Thisthe existing left and right signals and low
is done by carefully slitting the tapeAC-3 evolves from Dolby LaboratoriesOfrequency information derived via filters
seams on the bottom and collapsing theconstant research into new ways toor an electronic crossover gave home
carton down to a more two dimensionaldeliver high quality audio for theatrical
appearance. Other cardboard inserts maymotion picture presentation andtheater and musical presentations a
be stored in the same manner. Packingtransmission via satellite andrealism never before possible.
materials that cannot be collapsedtelecommunications links. In fact, theDolby Digital takes surround sound to a
should be saved along with the carton inOAC� in AC-3 stands for OAudio Coding,�new and even higher level. The use of
a plastic bag. the technique used in Dolby Digital fordigital recording techniques enables all
If you do not wish to save the packagingdata compression. surround channels to be full range,
where the surround channel in older
materials, please note that the cartonThe ADP303 digital demodulator/matrix surround systems is frequency
and other sections of the shippingdecoder brings that same 5.1 channellimited. Dolby Digital also delivers six
protection are recyclable. Please respecthigh quality sound that accompaniesseparate, discrete channels, including
the environment and discard thosemany major motion pictures into yourhighly defined left and right surround
materials at a local recycling center.home when used with a compatible laser
disc player, as well as from future Dolbychannels. With two rear channels instead
When positioning your ADP303 in itsDigital sources such as DSS, Digital Videoof the single, mono channel of Dolby
final location, make certain that anyDisc (DVD) and High DefinitionProLogic there is a greater feeling of
shelf or stand is capable of supporting itsTelevision (HDTV).reality and presence for surround effects
weight, and that there is adequatesuch as Oflyovers� of planes and
ventilation on all sides, as well as on theFor todayOs Laser Disc systems the digitalspaceships. Discrete digital sound also
top and bottom. Do not place CDOs,audio signal is recorded as a modulatedenables complete separation between the
record jackets, ownerOs manuals, or otherRF signal, similar to the signals used forleft front, center, right front, right rear
paper on top of, or beneath the unit. ThisFM and TV broadcasts. That is whyand left rear channels. The matrix
will block air flow and create a potentialconnections to a laser disc are madesystem used in conventional surround
fire hazard. If the unit is to be enclosedthrough an ORF� input. New technologyrecordings was often plagued with cross
in a cabinet or rack, make certain thatproducts such as DVD will feature directtalk between the channels. That is now
there is adequate air circulation, with adata outputs, and they are connectedgone with Dolby Digital.
means provided for hot air to exit, anddirectly to the ADP303Os decoding
for cool air to be brought in.circuitry, without the need for the
demodulator stage. Both Coaxial and
Optical data inputs are available.
Traditional Ostereo� recordings consist of
two channels, left and right, even though
the original intent of sound engineers
was to have a multitude of channels
available to present a realistic audio
soundfield. Unfortunately, early
recording techniques for vinyl records |