Junger Audio d07 - Digital Transmission Processor - Manual (Page 49)

Introduction & Reference guide
LEVEL
MAGIC
d06 d07 b46 C8007 C8046
Jünger Audio Studiotechnik GmbH
Justus-von-Liebig-Strasse 7
D -12489 Berlin
Germany phone: +49 (030) 677721- 0
fax: +49 (030) 677721- 46
email: [email protected]
http://www.junger-audio.com
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1. We do not perceive level changes if they happen in a certain period of time
dependent on the absolute value of the level change.
That means any slow level changes are not perceptable by the human ear.
That explains very clear why it is most important that AGC may not work too fast
(1dB/4-5sec)!! A fast acting AGC would cause perceptable level changes. But we are
looking to get an mostly inaudible levelling procedure.
If a fast level adjustment is required (because of transients), this is done by the
Transient Processor.
2. Level jumps rising over a certain absolute value are very unpleasant for our
ears.
Of course, it depends on the type of audio material and consequently on its loudness
which absolute value of level change really annoys. A jumping level of 6dB is
remarkable. A quick level change of 10…12dB becomes annoying for the human ear!
So it’s necessary to avoid major level changes. The transient processor of Level Magic
is a solution for that.
10dB /40 sec 10dB /10 sec
If for example the audio level rises from
-20dBFS to -10dBFS within one minute you
won’t realize it, unless the level gets over an
bearable value or the audio masks other
sources you would like to listen to. But if the same level
change happens in 10
seconds it will be very
noticeable!
To understand the principle of the new algorithm and the adjustment of LEVEL MAGIC
it is necessary to keep some psychoacoustic aspects in mind