Input Routing Selection And Internal Signal Route; Input Section; Output Section; Internal Processing Layout - powersoft M30D HDSP+ETH User Manual

experienced user as well as a complete tool with remote control
for the end user. The ADAU 1701 device is a fixed point DSP
with 28-bit resolution for the internal path and 56-bit for internal
processing. The board also provides full remote control through
Armonía Pro Audio Suite.
The M Series DSP is modular for any channel pair, meaning,
for example, that on a MxxD one module is available for channels
1 and 2 while on a MxxQ there are two modules available: one
for channels 1 and 2 and another for channels 3 and 4. Keep in
mind that the modules are physically separated, therefore input or
output from different modules can't be mixed together.
9.4.2

Input routing selection and internal signal route

Due to the internal amplifier structure, it is impossible to mix
signals from non adjacent channels: for example, channel 1 and 4
cannot be mixed together but only channels 1-2 and channels 3-4
(on MxxQ models) can. The following configurations are possible
for any channel pair:
f 1 input – 2 outputs
f 2 inputs – 2 outputs
f 2 mixed inputs – 2 outputs
9.4.3

Input section

The input section allows system operation to improve sound
for a specific zone, group of speakers, room, etc. The input section
provides an input eq for any input channel with the following
features:
f 5 biquad filters, any filter can become PEQ, shelving hi-lo
pass, all pass
f Delay: up to 170 ms for 2 in/2 out and up to 340 ms for 1
in/2 out configurations
f Gain between -40 dB and 6 dB
f Mute
f Reverse polarity
9.4.4

Output section

The output section allows multiway cabinet equalization and
protection. The output section comprises an output eq and a
limiter (peak and RMS) for each channel.
f Eq feature:
f 12 biquad filters, any filter can become PEQ, shelving hi-lo
pass, all pass. The crossover functions are obtained using
one to four biquad filters for each crossover.
f
Delay of 10 ms
f Gain between -40 dB and 6 dB
f Mute
f Reverse polarity
f Peak limiter feature:
f Threshold, 20 – 135 V. With 1 V steps
f Hold time, 0 – 2 sec. With 1 ms steps
f Release time, 0 – 2 sec. With 1 ms steps
f RMS limiter feature:
f Threshold, 13 – 312 W @ 8 �. With 1 W steps
f Attack time, 2 – 4500 ms. With 1 ms steps
f
Hold time, 0 – 1 sec. With 1 ms steps
f Release time, 4 – 4500 ms. With 1 ms steps
f Two biquad filters for frequency shaping. Frequency
shaping is a function obtained by pre and post limiter eq.
The same eq (with opposite gain) is applied before and
after the limiter.
f Damping control:
f
Impedance correction between -2 � to +2 � with 0.1 � steps.

9.5 Internal processing layout

The following two layouts are available for each module (and its
associated channel pair):
f 1 In / 2 out basic layout
f 2 In / 2 out basic layout with mono mix capabilities.
Due to the internal structure of the DSP, in order to optimize
performance, two different binary presets for 1 input / 2 output
configurations and for 2 input / 2 output configurations must be
used. Be aware that any change in the binary preset causes an
audio interruption while the M Series microprocessor loads the
preset data into the DSP. This means that a change in configuration
(e.g. going from 1 input to 2 inputs ) or reloading a preset from
the internal memory results in an audio interruption.
NOTE: The following information is valid for any single DSP
module (2 channels). Devices with 4 channels are formed by 2
completely independent modules.
9.5.1

Input routing

The two following configurations are available:
f 1 In / 2 out, the input is routed from channel 1.
f 2 In / 2 out, the input is routed from channel 1 and channel 2.
It is possible to mix the two signals together; the mono mix
function sums the two sources and halves their summed level.
9.5.2 Input section
The input section is formed by the input eq alone, one for
each channel of the loaded layout. For example, in the 1 input /
2 output module layout there is only 1 input eq for both output
channels. Every input eq has 5 biquadratic filters which can be
chosen and assigned from the set of standard IIR filters.
9.5.3 Output section
Every module provides each channel with a set of 12 biqaudratic
filters and a complete set of limiters for protection purposes:
f Output eq: 12 biquad filters can be chosen for shaping (PEQ,
shelving, etc) but these are shared between the crossovers.
Each crossover can consume 1 to 4 biquad filters, depending
on the crossover slope. TABLE 2 and TABLE 3 illustrate
a number of crossover configurations. Mixed crossover
configurations are possible (e.g. HP 12 dB/oct, LP 24 dB/oct).
f Peak limiter for every output.
f RMS limiter for every output.
f Frequency shaping.
f Damping control for every output.
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