Lectrosonics DM1612, Справочное руководство, Страница: 9 / 48

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Reference Manual for Operation
Rio Rancho, NM – USA
General Overview
As digital technology continues to advance in a variety
of markets and products, considerable benefits also
evolve in audio processing systems for installed sound
systems that employ multiple microphones and loud-
speakers in a common acoustical space. The DM
Series digital processors take advantage of these
advances with hardware/software designs that address
modern applications in boardroom, courtroom, sound
reinforcement and teleconferencing systems.
The latest generation DSP microchips and microproces-
sors are the core of the engineering of the DM Series
products. The focus and purpose is to meet the require-
ments of modern applications and also the demands for
convenience and automation.
The diagram below depicts the overall structure of the
DM1624 processor. All models in the DM Series offer
the same signal processing functions, and vary only by
the number of audio inputs and outputs available.
Each input channel includes a high quality analog
preamplifier, with digital and analog level control to
maximize signal to noise ratio and minimize distorion,
followed by a 24-bit A-D converter. Extensive digital
signal processing is provided on each input channel.
The audio signal is then delivered to a digital matrix
processor for routing.
The digital matrix mixer distributes each input signal to
any selected combination of outputs, with level control
at each crosspoint. Each of the 24 outputs includes
extensive signal processing to optimize the mixed signal
for the intended purpose, such as sound reinforcement,
recording or teleconferencing.
Signal Flow
The basic structure of the DM processor consists of
three stages: Input, Matrix and Output. Each input
channel is processed and filtered as needed and the
signal is delivered into the matrix. The matrix processes
the signals and delivers them to the assigned outputs
and communicates with other devices in the system.
Each output receives signals from the mixing matrix, the
pink noise generator or the tone generator as needed
for setup, diagnostics or operation.
When multiple units are stacked, mixing data and the
digital audio are passed between the slave units and the
master unit through the expansion ports. Multiple units
can be stacked in a master/slave configuration to
expand the number of inputs to hundreds of channels.
The audio and data from all units in the stack is gath-
ered in the matrix in the master unit, which is where the
output signals are generated. The output signals for
channels 1 through 12 are sent to each slave through
the expansion bus. These signals are available on the
slave unit outputs 1 through 12, and repeated on
outputs 13 through 24 on the DM1624 only. The output
processing for the outputs is applied in the master unit
in the stack.
16 by 24+2
Mixing
Matrix
Input #1
Processing
Input #16
Processing
Output #1
Processing
Output #24
Processing
Tone
Generator
1 kHz, 0 dBu
Pink Noise
Generator
0 dBu
24 Output Submixes
2 Expansion Submixes
26 Automixing Aux. Data
2 Expansion Signals
26 Automixing Control Data
24 Output Submixes
2 Expansion Submixes
26 Automixing Aux. Data
2 Expansion Signals
26 Automixing Control Data
.
.
. .
.
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DM1624 Signal Flow Block Diagram
12 Final Mixes
12 Final Mixes