Gilderfluke&Co old MACs 8 bit Digital Audio System - Manual (Page 20)

Digital Audio Repeater/Mixer Cards:
These cards are the heart of the MACs Digital Audio System. Each card contains virtually all of the
circuitry needed to reproduce and process one audio track. Up to 16 of these cards can fit into one
CC-1600 card cage. The Digital Audio Repeater / Mixer cards are available in four versions to best suit
your needs:
DR-100: Digital Audio Repeater and Shelving Equalizer only.
DR-300: Full card containing Digital Audio Repeater, Mixer, Voltage Controlled Amplifier,
Public Address / Muting System, and Shelving Equalizer.
DR-400: Public Address/Muting System, Mixer, Voltage Controlled Amplifier, and Shelving
Equalizer.
AB-100: Stand-alone version of the DR-100 Repeater card. Comes complete with power
supply and case.
A basic DIGITAL AUDIO SYSTEM consists of:
¥ One Digital Audio Repeater / Mixer card for each audio track (DR-100)
¥ Card Cages to hold the Digital Audio Repeater / Mixer cards
¥ Power supplies
¥ Power amplifiers
¥ Speakers
DIGITAL
REPEATER/
MIXER CARD
AMP
EXT. INPUTS
DIGITAL
REPEATER/
MIXER CARD
AMP
EXT. INPUTS
DIGITAL
REPEATER/
MIXER CARD
AMP
EXT. INPUTS
DIGITAL
REPEATER/
MIXER CARD
AMP
EXT. INPUTS
DIGITAL
REPEATER/
MIXER CARD
AMP
EXT. INPUTS
UP TO 256
DIGITAL REPEATER/
MIXER CARDS
SERIAL
PORT
In the basic system DIGITAL REPEATER / MIXER cards act as the source for the audio material and/or to
process audio signals before sending them to the power amplifiers and speakers. Up to 256 audio tracks
can be supported by using up to 256 Digital Audio Repeater / Mixer cards. The DIGITAL REPEATER is
normally the primary source of audio for each track on DR-100 or DR-300 cards. Secondary audio
sources can be fed into one of the two external mix inputs available on each DR-300 and DR-400 card.
These can come from external sources like audio tape, CD's, video, film, or live microphones.
Additional mixing between individual cards can be done using the MIX / GLOBAL bus available on all
DR- Repeaters. The MIX BUS can be used to send a signal which is the combination (sum) of any number
of audio signals from other cards into any other one card. This can be used where you need a mixed
output, or for bi-amp or sub-woofer applications. The GLOBAL BUS can be used to send the output from
any one card to be mixed into the outputs of any number of other cards. This can be used if you need
to send a background sound or music to a number of different audio tracks.
The Digital Audio Repeaters can be configured to whatever you want. They can play any spiel just
once, or loop any spiel continuously. A delay can be inserted before each spiel, or between each
iteration when looping. The control signals for the Repeaters can be sent to them through the serial port,
or through the two opto-isolated inputs and auxiliary port available on each card. The external inputs
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