Bosch Digital Congress Network Data Brochure page 5

4 | Introduction | DCN Data Brochure
Complete range of equipment
The full range of DCN products includes contribution
units, central control units, simultaneous interpretation
and language distribution equipment, application-
specific software modules, information display systems
and installation equipment. This is complemented by
external equipment such as video and dot matrix dis-
plays, PCs, monitors, booster amplifiers, loudspeakers
and printers, all of which are fully compatible and easily
integrated into the DCN system.
Simple 'daisy-chain' installation characterises the DCN system.
Advanced digital technology
Signal transmission and processing is handled by
proven digital audio technology. An example of this
is the high-performance 'Bitstream' system used for
analogue-to-digital conversion in delegate microphone
units. This technology is integrated into custom single-
chip analogue-to-digital and digital-to-analogue con-
verters around which most DCN units are based. Other
ICs specially developed for this application include
dedicated protocol converter chips. The system
combines the highest levels of functionality and
performance in an extremely compact design.
The diagram above shows how the 'building blocks'
of the DCN fit together. The Audio Communication
Network (ACN) family of protocol converter chips are
simply connected to the network cabling carrying the
digital signal. In addition to bi-directional protocol
converters for contribution equipment and central
control units, there is also a uni-directional ACN chip
for channel selection units for distribution only.
The Praedics (Professional Audio Encoder Decoder
Integrated Circuits) are combined analogue-to-digital
and digital-to-analogue converters. These devices
convert the digital signal from the DCN to audio, and
Praedic ACN 1
LBB 3510/00
Network card
DCN Discussion
Delegate/chairman/Interpreter
(contribution & distribution)
DAC ACN 3
Delegate/chairman unit (Concentus)
Channel select unit
(language distribution)
ACN 1 - up/down
ACN 2 - up/down
ACN 3 - down only
LBB 3512
Data Distribution Board
ACN 1
Flash
proc. RAM
E-PROM
Central Control Unit
The 'building blocks' of DCN
convert the contributor's audio signal to digital, ready
for protocol conversion by the ACN chip.
Excellent audio quality
The result of this advanced digital technology is excel-
lent audio performance with no loss in signal quality or
level during transmission. Subsequently, each delegate
receives an audio signal of consistently high quality,
which makes a significant contribution to speech intel-
ligibility. DCN virtually eliminates problems associated
with conventional systems, such as background noise,
interference, distortion and crosstalk.
Reduced installation costs
Fast, cost-saving installation is an important benefit of
DCN digital technology. A thin, flexible, twin-coaxial
cable carries all the system's digital signals, therefore
eliminating the need for costly and vulnerable multi-
core cables used in conventional analogue installations.
This twin-coaxial cable can easily be run through exist-
ing ducting and cable conduits. It can simultaneously
carry up to 16 high-quality contribution channels,
16 high-quality distribution channels - typically inter-
pretation languages - plus 10 channels for messages and
other data.
PC-bus
ACN 1 Praedic
ACN 1 Praedic
ACN 3 DAC
e.g. Hall Display
proc
ACN 1
ACN 1 Praedic
Control
Panel
Personal
Computer
DSP