Mirage Digital Evolution
AEV Broadcast Srl via della Tecnica 33, 40050 Argelato Bologna ITALY
www.aev.eu [email protected]
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9.2 Table with values related to the various types of instruments.
ATTACK
RELEASE
TRANSITION
DRIVE
VOCAL(Voice)
25mS – 100mS
100mS – 500mS
15
2-4
cyclic bass
25 mS
25 mS
1 - 4
12 - 15
(pasty bass)
100mS – 500mS
100mS – 500mS
1 - 5
10 - 15
RAGING
ELECTRIC
GUITAR
25mS
1000mS - 2000mS
1 - 2
15
ACOUSTIC
GUITAR
100mS – 500mS
100mS – 500mS
2-4
5-8
BRASSY HORNS
25mS
25mS
1-2
12-15
DRUMS(rullan)
25mS
25mS
2-5
12-15
DRUMS(dishes)
25mS
1000 - 2000mS
2-10
10-15
Being clear that music is a set of sounds created by instruments with different tones and dynamics, one
must try to reach the best compromise according to what will be processed.
An ATTACK TIME of 500mS and a RELEASE TIME of 2000ms will be fine for all the tools above.
Only the TRANSITION, the DRIVE and eventually the CLIPPER (see figure 3) will be left to adjust the
transmission band within the + or - 75Khz according to the requirements.
Fig 3
The process settings will remain valid for any type of selected input (Analog, AES/EBU or Optical).
The settings of the CLIPPER PREEMPHASIS and the 15Khz FILTER insertion must be made in the
respective menus, ANALOG OUTPUT, DIGITAL OUTPUT and STEREO CODER, according to the
requirements.
The graph in Figure 3 shows the right way of adjusting the CLIPPER.
The graph in figure 4 shows the exaltation of the frequencies to the insertion of the 50uSec preemfasis,
similar to the 75uSec trend.
