Junger Audio d06 - Digital Audio Leveler - Manual (Page 11)

2. FUNCTIONAL DESCRIPION
operation manual d06, chapter 2 - Functional Description - page 5 of 8
The static characteristics of the d06 limiter usually refers to a digital output
level of 0 dBFS (dB Full Scale). This is useful for most applications of the
dynamics processor as the on-following digital recording system is supposed
to be balanced down to the final bit.
For applications using headroom the output level can be adjusted within 0 ... -
20 dBFS in steps of 0.1 dB. The limiter threshold determines the maximum
output level.
The static characteristic for the limiter at a limiter threshold of -12dBFS is
illustrated in fig. 6.
-50
-40
-30
-20
-10
[dBFS] -10 -20 -30 -40 -50 -60
output
input
limiter
threshold
0...-20dBFS
max. output
level
For the dynamics functions a signal delay of approx. 2 ms is built in. This
delay makes it possible to arrange the algorithm of the limiter in such a way
that the control mechanism is activated before maximum level is reached (look
ahead limiter). Within the rise time of the signal the peak level is recognised
and the maximum is calculated in such a way that limiter threshold level is
reached precisely without causing clipping.
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 realize dynamics processors (compressor, limiter, expander) with
very high audio quality, without signal discoloration, pumping or breathing,
without distortion and modulation products - in short, with almost inaudible
processing - and they are very easy to use.
2.3.3
LIMITER
fig. 6:
basic function:
limiter
2.4
THE JUNGER
AUDIO DYNAMICS
PROCESSOR
PRINCIPLE