Junger Audio d02 - Digital Dynamics Processor - Manual (Page 8)

1. THE DESIGN OF THE DEVICE
Traditional compressor and limiter designs only have one control circuit
with corresponding attack and release times, which have to be
adjusted manually by the user. An optimal setting of all parameters for
dynamic range processing with as little disturbance as possible must
be determined by listening and comparing.
A lot of experience and also a lot of time is necessary to get sufficient
results. These parameters , once found, are only the right choice for a
certain programme signal and must be changed for other signals.
Dynamic range processors which split the audio frequency spectrum
into several bands, i.e. which have a multi-band structure, have some
advantages over traditional compressor designs. The dynamic control
parameters in each band are independent of one another and can be
set in such a way that a broad program range can be processed well.
Disruptive side effects such as pumping and breathing can largely be
avoided. The disadvantage of this system lies in the problem of
rebuilding the output signal, which is the sum of all filters including
those where dynamic changes have taken place as part of the control
process.
The output signal is always coloured and deviates from the input signal
in sound.
The dynamic range processor principle developed by Jünger Audio
makes it possible to realise dynamics processors (compressor, limiter,
expander) with very high audio quality, without signal discolouration,
pumping or breathing, without distortion and modulation products - in
short, with almost inaudible processing - and they are very easy to use.
The Jünger Audio dynamics processors work according to a Multi-loop
principle, operating with an interaction between several frequency
linear control circuits. The resulting attack and release times of this
system are variable and adapted to the evolution of the input signal.
This allows relatively long attack times during steady-state signal
conditions but also very short attack times when there are impulsive
input transients.
The Multi-loop structure also permits a short time delay between the
control circuit and the gain changing element. The gain control circuit
has time to preview the signal and become active before it reaches
the output. This is particularly important for the limiter, which provides
a precisely leveled output signal absolutely free of overshoots
(clipping).
With a digital signal processor, a large number of parameters of the
audio signal are evaluated and there is a permanent, automatic
optimisation of the parameters of all control circuits.
Together with its attack and release times which determine the
dynamic qualities, the performance of a dynamic range processor
depends on the static compression characteristic.
The d 02 digital dynamics processor is a dynamic range processor
which, contrary to its conventional counterparts, is effective for a wide
dynamic range of input signals (50 dB).
traditional compressor
and limiter designs
multi-band structure
multi-loop principle
delay time
1-2