Lectrosonics DM84 Data Sheet
DM84
Digital Matrix Processor
• 8-in/4-out digital matrix architecture in a stackable configuration
• Programmable front panel level controls with activity LEDs
• 6 filters, 6 feedback eliminators (ADFE), compressor and delay on each input
• 9 filters, delay and compressor/limiter on each output
• USB and RS-232 interfaces for setup and comprehensive remote control
• Balanced, floating differential inputs and outputs - no pin 1 problem
• Digital I/O ports for "daisy chaining" and to connect other LecNet 2 devices
• Proportional gain auto mixing algorithm with AutoSkew
TECHNICAL DATA
™
- US Patent 5,414,776
• 128 global macros, each with up to 64 commands, and 115 characters per command
The DM84 combines a stackable 8-in/4-out automatic
matrix mixer with a powerful DSP signal processing
package and extensive remote control capabilities for any
sound system application with multiple microphones and
loudspeakers. Multiple DM84 units can be stacked to
expand the matrix with unlimited inputs and up to 12
outputs. The unit also supports the full LecNet2 digital
matrix, so it can also be integrated with other DM Series
processors in 24 output systems.
The primary applications are in sound reinforcement and
recording in boardrooms, courtrooms, worship centers,
distance learning systems, hotels and other applications
that benefit from matrix signal routing, automatic mixing
and remote control options. Once setup is completed with
the supplied LecNet2 software, the unit runs as a standalone device. Front panel controls are provided to make
minor adjustments to the input and output levels, expanding its usefulness into stand-alone applications. The
adjustment range of each control is defined in the software setup to optimize it for various needs.
The DSP features include a full complement of filters,
ADFE (automatic digital feedback eliminators), compressors, limiters and delay on every channel to optimize the
signal processing needed for every application. This
processing is available at the inputs to compensate for
microphone placement and signal characteristics, or to
adjust for differences in tonal quality or dynamics of
various signal sources. Each output has individual filters
and a proprietary, adaptive time constant compressor/
limiter to feed recorders or power amplifiers.
Extensive control capability is built into the unit with an
intuitive command structure to allow external control with
USB or RS-232 connections. Touch panel control systems
easily integrate into the command structure. Remote
control, monitoring and setup can also be done via
ethernet connections using a low cost interface provided
by another manufacturer.
Up to 128 macros can be stored in internal memory. Each
macro can contain up to 64 commands, with 115 characters in each command. Macros can be invoked with serial
commands from touch panel control systems or contact
switches connected to the logic I/O ports on the rear
panel. The macros can be chained so that one macro can
call another one, which may call yet another one. In
addition, a built-in macro recorder greatly simplifies the
creation and use of macros.
The audio inputs and outputs are balanced, differential
circuits (no pin 1 problem) to eliminate noise from external RF and power sources, even with long cable runs.
The patented gain proportional automatic mixing algorithm* is applied at the crosspoints in the matrix so each
input can behave differently at each output. For example,
input 4 can be a microphone that participates in the NOM
attenuation applied by the auto mixing algorithm at some
of the ouputs, and operate as a direct signal for recording
at other outputs.
Rio Rancho, NM, USA
www.lectrosonics.com
General Overview
The LecNet2 product group introduces a powerful series
of audio components and unique solutions for the design
and installation of sound systems with multiple microphones and loudspeakers. The DM84 is a very useful
member of this family in that it can satisfy cost conscious
applications in stand-alone operation, or function as a
building block to configure larger systems. It addresses
the full digital matrix of the DM Series so it can also be
used with other models to add additional inputs and
outputs. The range of the front panel level controls can be
configured to suit specific preferences.
Digital Matrix
The digital signal flow provides an expandable digital
matrix with no crosspoint limitations. Automatic mixing
takes place at the crosspoint in the matrix so that every
input can participate in every output group at a different
level and with a different auto mixing behavior to optimize
the channel behavior for specific purposes.
In addition, a DANI (Digital Audio Network Interface) bus
is provided so that the digital audio signals and data from
the master and slave units are connected in stacked
configurations in larger sound systems.
Automixer Cell
The Automixer Cell is the core of the matrix. It is where
level control for the automatic mixing algorithm, mixing
mode and crosspoint gain is applied using data gathered
from other channels and devices. In a stacked configuration, the cell receives data from the master unit above it
and from the slave units below it. The final mix is generated in the master unit and the data is returned back to
slave units to implement automatic mixing.
TxTxRx
Rx
Quad RJ -45 Conn
Output Volume Control Pots
Phan
In 1
On/Off
Phan
In 2
On/Off
Phan
In 3
On/Off
Phan
In 4
On/Off
Phan
In 5
On/Off
Phan
In 6
On/Off
Phan
In 7
On/Off
Phan
In 8
On/Off
Sync Audio Fr ame Sync
Digital
Audio
Network
Interface
(DANI)
Input Gain Control Pots
Prog
Prog
Prog
Prog
12 + 2 Submix + Mix Control
12 + 2 Mix + Mix Control
12 + 2 Mix + Mix Control
12 + 2 Submix + Mix Control
Prog I /O Conn
11
8
4
A/D Signal Pr ocessi ngProg
A/D Signal Pr ocessi ng
A/D Signal Pr ocessi ngProg
A/D Signal Pr ocessi ng
A/D Signal Pr ocessi ngProg
A/D Signal Pr ocessi ng
A/D Signal Pr ocessi ngProg
A/D Signal Pr ocessi ng
DB25
Prog I/O
Port
LecNet 2 C onn
1/8 '' Jack
8
RS-232
Port
Micro
12
Control ler
A/D
Control Signals
DM84 Functional Block Diagram
Front & Rear
USB B Conn
USB
Port
8 input 4 output
tric olor s ignal
indicat or LEDs
SHARC is a r egister ed tradem ark of
8 by 24 (+ 2) Automati c Mixing Matri x
Off: No signal
Green : Signal present
Orange : Compr essor/ lim iter active
Red: Cl ipping
Third Generation
®
DSP
SHARC
Analog Devices , Inc.
Signal Pr ocessi ng D/A
Signal Pr ocessi ng D/A
Signal Pr ocessi ng D/A
Signal Pr ocessi ng D/A
1 kH z Tone Gener ator
Pink N oise Gener etor
Out
Out 1
Atten
Out
Out 2
Atten
Out
Out 3
Atten
Out
Out 4
Atten
Power of the Mix
The Power of the Mix is the reference used to determine
the gain to be applied to each individual output channel.
In a multi-unit stacked configuration, this data is sent to
the slaves from the master unit.
Crosspoint Gain
Crosspoint Gain is the gain selected with the control
panel that determines the level at the output.
Submix
Power of the Mix
Digital Matrix Functional Block Diagram
(single crosspoint shown)
Audio Input
Power of the
Submix
Automixer
Cell
Power of the
Submix
Mixing Mode
- Auto
- Direct
- Override
- Background
- Phantom
Crosspoint Gain
-70 to 20 dB
1 dB steps
+
Submix
24 Output Submixes
2 Expansion Submixes
26 Automixing Aux. Data
Input #1
Processing
Input #8
Processing
24 Output Submixes
2 Expansion Submixes
26 Automixing Aux. Data
DM84 Signal Flow
2 Expansion Signals
Automixing Control Data
24 by 12+2
Automatic
Mixing
Matrix
2 Expansion Signals
Automixing Control Data
Output #1
Processing
Output #4
Processing
Tone
Generator
1 kHz, 0 dBu
Pink Noise
Generator
0 dBu
2
Mixing Mode
The automatic mixing algorithm applies a patented gain
proportional algorithm (
#5,402,500
output to behave differently relative to the other inputs
assigned to the output.
Five different mixing modes are available:
) allowing each input assigned to a particular
Auto - In automatic mode the input applied to the
crosspoint is mixed into the output channel using
the the Adaptive Proportional Gain automixing
algorithm in the normal manner. This is the most
common setting.
Direct - In Direct mode the automixing algorithm is
bypassed.
Override - Override mode is selected when it is
required that the input applied to the crosspoint
always dominates the output channel when it
becomes active.
Background - Background mode is selected when
it is required that the input applied to the crosspoint
dominates the output channel only when all other
inputs are inactive.
Phantom - A special mode that allows an input to
participate in the auto mixing activity at one or more
crosspoints, but the audio signal is not delivered to
the output. In essence, the NOM mixing activity is
separated from the actual audio signal. This allows
NOM attenuation to take place between zones in a
mix-minus sound system design. It preserves the
discrete signal routing implemented in a mix-minus
sound reinforcement system that isolates microphones and loudspeakers.
US Patents #5,414,776
and
LecNet2 Software
Software is included with the DM84 and available for
download from the website at:
The software is used primarily for setup, with the configuration saved on file and into the unit's memory for actual
operation. Once configured, the DM84 runs without a
host computer.
The software is user-friendly, with a variety of screens
provided for each section of the signal flow and system
design. The software runs under Windows
operating systems using a familiar tabbed layout. A few
sample screens are shown below.
www.lectrosonics.com
®
2000 and XP
.
*Windows is a registered trademark of Microsoft Corp.
3
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