Junger Audio b42 - Dynamics Processor User Manual
Page 12
2. FUNCTION DESCRIPTION
page 2-6 operation manual b40, chapter 2 -Function description-
each kind of programme material. The algorithm has to guarantee best
reaction for fast increasing level of transient signals anytime even if
classical music with slow dying out characteristic is processed. In all
cases the attack time of the limiter for very short transients is zero.
Especially the release time of the control circuit has more influence to
the increase of loudness as any other parameter. The ranging of time
constants in processing time groups reflects this fact. The range for
processing time shows influence on release time parameter mostly.
The selection of the parameter PROGRAM changes the range of time
constant values as follows:
PRO
processing time
corresponds to
preset
----------------------------------------------------------------------------------------------
0
2 ms to 0.2 sec
1
5 ms to 0.5 sec
LIVE
2
10 ms to 0.8 sec
3
15 ms to 1.2 sec
SPEECH
4
30 ms to 2.5 sec
POP
5
50 ms to 3.5 sec
6
70 ms to 5.0 sec
UNIVERSAL
7
100 ms to 6.0 sec
8 150 ms to 8.0 sec
CLASSIC
9 250 ms to 10.0 sec
In case that the input signal (audio pair 1/2 or/and 3/4) is not audio (but
AC-3, Dolby E, MPEG..) the input can be feeded directly to the related
output bit transparent (no bit changes). The unit is switching to
transparent automatically if “non audio” flag in the Channel Status Bit
of the AES signal is set. Otherwise transparent mode can be set
manually by the user.
A change in the dynamic range of an audio signal is a non-linear
process. The gain of a dynamic range processor is not constant as it is
with the gain of a linear amplifier. The gain varies in time depending on
the input signal and depending on the specific control algorithm of the
dynamics processor. These variations in the gain, which represent the
real control process, should take place without any bothersome side
effects.
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. This is quite different to the popular
multiband structure which changes the sound.
The resulting attack and release times of the Multi-loop-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.
2.3.7
TRANSPARENT
MODE
2.4
THE JÜNGER AUDIO
DYNAMICS
PROCESSOR
PRINCIPLE