6. APPLICATION NOTES
A A
f
delay
1
1
2
2
n
m
f
Multi - Band
Multi - Loop
fig. 1:
basic principles of
dynamic range
processors
6.2
INFLUENCE OF SIGNAL DELAY TIME
The audio signal delay through the dynamics
processor is approx. 2ms @ 44.1/48kHz or
1ms @ 88.2/96kHz due to delaying of the
audio signal using internal memory. A small
delay is deliberately introduced to the audio
signal in order to allow limiter and compressor
algorithms which can 'preview' the audio
signal before changing it. That is the signal
curve can be changed before maximum level is
reached. (see chapter 2.3.5).
This delay must be considered before
attempting to mix signals processed by the
dynamics processor with other undelayed
signals.
When mixing together a delayed signal and a
direct signal there may be cancellation of the
signal waveform at some frequencies and re-
inforcement of the waveform at other
frequencies (comb filter effect). Corresponding
2ms or 1ms delay of direct signals should
therefore be carried out before mixing them
with delayed processed signals.
6.3
CHANGING THE PROCESSING CHARACTERISTIC
The basic Multi-Loop principle of Jünger Audio
dynamics processors operates with adaption of
dynamic range control parameters to the
incoming audio signal. That means permanently
analysis and calculation of attack times, release
times , thresholds and interaction parameters of
several frequency linear control circuits.
(please refer to chapter 6.1 also)
For some of the control parameters it is
possible to define a limited range of time
constant values which is allowed for the
adaptive dynamic range algorithms. Inside this
range the time constants can be varied by the
adaptive processing. Setting the range of time
constant values may be sometimes useful, to
get the best signal processing performance
regarding specific programme material.
page 6-2 operation manual accent2, chapter 6-Application notes-