Gated Reverb - ENSONIQ DP/4 Musician's Manual

Section 4 - Algorithms
GATED REVERB
00 - Gated Reverb provides a superb gated reverb. When a reverb is muted partway through, it
creates a gated sound. To achieve this gated effect, both the Gated and Reverse reverbs must gate
a number of internal parameters, not just the output amplitude envelope. It is however, the
output amplitude over which the user has control. The DP /
4
offers a highly controllable gated
reverb, optimized for percussive instruments, but useful for any input signal. The gate is first
opened when the input signal passes the trigger threshold. This trigger threshold is set as low as
possible by the user, so that none of the input signal is missed. The gated reverb is distinguished
from the reverse reverb by retriggering whenever the input signal passes a retrigger (user
programmable) threshold (see diagrams). The gate will stay open as long as the input signal
remains above the retrigger threshold, and all the input signals will be accumulated under this
gate until the total input signal level falls below the retrigger threshold. When this happens, the
Hold Time will begin (as shown in the diagram below). The reason there are two thresholds is to
eliminate false retriggering and to ensure precise hold time durations. If you desire a separate
gate on each and every note, use the Non Lin reverbs. The topology for the Gated Reverb is
derived from the Plate Reverb.
Gated Reverb with a High Retrigger Threshold
Hold Time
~--------------~ Release
Attack
Time
~_~!
I
1-+----+------------+---+
1
- -
Retrigger
I
Level
HJ---\-+----ir--lHhf--\-A-.,.~--+----iI--
Trigger
Time
Gated Reverb with a Low Retrigger Threshold
l
0
Ime
;.
f' I
Hold Time
-""
,
r
Hold Time ;.
l
Hold Time
l
,
1
~ old Time
...
Holi::lllime
"-
H
Ie
Time
Level Hoi jtim~ I
I
" J
;
j '
r\
;1
h
!
I
, r
A
V V
V
V
V \f'o-..... ___
Signal
-
Time
ENSONIQ DP/4 Musician's Manual
I
Retrigger
Trigger
67