Gilderfluke&Co old MACs 8 bit Digital Audio System User Manual

Page 12

well.

Dynamic range of up to 72 dB, again roughly equivalent to a new audio tape.

Up to 255 different messages can be stored on each repeater. Any of these can instantly be
accessed through the RS-485 serial port or switch inputs. This lets you easily build interactive
audio systems.

Dynamic Bandwidth Optimizationª allows the repeater to dynamically follow the highest
frequencies of the source material. It will actually stop using any memory at all if an instant of
silence occurs!

Two opto-isolated switch inputs, as well as a parallel auxiliary port and RS-485 serial port on
each card.

OP-100 optoisolator available for auxiliary port. 1/4 J6 input is compatible with all our
animation systems.

All configuration is done through the serial port with easy to use menus (or with onboard
dipswitches).

One optically isolated status output for remote ÔrunningÕ indicators.

Global/Mix bus allows signals to be mixed into any cardÕs output or a signal to be sent from one
card to any number of other cards. This can be used for sending background tracks or
announcements to any number of cards in an installation, or for combining a number of
outputs from several cards into one.

Volume, Mix/Global bus volume, and Bass and Treble controls on every card. These are on a
small Ôadjuster cardÕ, which can be moved between cards without changing any of the
settings.

DR-100 and DR-300 cards plug into CC-1600 (16 slot) or CC-400 (4 slot) card cages. Rack kits
are available for CC-400 cages.

You can use any number of cards in a system to provide any number of simultaneous audio
tracks.

An AB-100 is a digital audio Repeater which can be used when all you need is a single audio track. It

is a 5 x 12 x 2-1/2 inch box which can be mounted wherever you need to put it. Power for the AB-100
comes from a small wallmount power supply or a 12 VDC power supply for mobile installations.

All configuration and commands for the AB-100 are identical to those for all of the other DR-100

Repeaters. It just wonÕt respond to commands for features for which it doesnÕt have hardware installed
(like the PA system commands).

To record a sound into a Digital Audio Repeater, a master (tape, CD, DAT, video tape) of the sound is

played into a IBM compatible computer which has a DAS-100 Digital Audio Sampler installed. The DAS-
100 takes the original audio and turns it into digital computer data. This data is then 'burned' into
computer memory chips called EPROMs. These are plugged into the Digital Audio Repeaters. From this
point on, the repeaters can play back this sound whenever they are told to. Since the sound is stored on
the repeater in computer memory chips, it will never change or require any service of any kind. Any
tape deck would require regular cleaning and lubrication of the tape heads and moving parts, as well as
their regular replacement.

Each Digital Audio Repeater can store up to 255 separate messages in its memory. Each of these

can be any length from 1/35th of a second on up. Each of these individual messages is known as a
'spiel'. To access these individual spiels on a card, you can use the serial port interface to the audio
system or the AUX PORT available on each card. Any spiel on any card can be played through or looped
at any time.

Our Digital Audio Repeaters are intelligent, they know how to 'downshift' their bandwidths to follow

the highest frequencies in your audio. If there is a moment of silence in your recording, it will actually
stop using any memory at all until the sound starts up again. Because of this, our systems are able use
far less memory for an equivalent bandwidth. They are also able to play back both low and high
bandwidth sounds from the same Repeater card. The Digital Audio Repeaters each check on how much

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