The Audiotrigger - Schippmann ebbe und flut User Manual

Position „LOG":
2. „level"-knob (1) in fully clockwise position, gain-switch (22) in position +20 db:
Position „LIN":
Position „LOG":

9.2 The audiotrigger

The audiotrigger consists of the control elements [slow/fast] (4) on the frontpanel and the
"TRIG OUT" (7) and (24) on the rearpanel. To a certain extent, the audiotrigger is a hidden function,
because there are no dedicated control elements on the frontpanel. It derives a trigger-puls from an
incomming audiosignal at socket (24) under certain conditions. This trigger pulse has a fixed duration
of approx. 40 ms.
In contrast to most other audio-triggers, this is a dynamic trigger. It does not trigger at an adjusted
threshold, but responds to changes in level, resp. increasing levels. Fig. 9.2.1 explains the functionality
of the audio-trigger:
Signal level
[db]
Trigger
Fig. 9.2.1 Functionality of the audio-trigger
The upper graph shows any level-course, derived from the audiosignal at socket (24). The trigger re-
sponds only to increasing levels within a minimum lapse of time. That means, the buildup of level has
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about 100 mV/dbV;
lower limit: 0 V output at -50 dbV input,
upper limit: 6.6 V output at 16 dbV input
about 10.5 V/Vrms;
lower limit: 0 V output at 0 Vrms input,
upper limit: 6.8 V output at 650 mVrms input
about 100 mV/dbV;
lower: 0 V output at -70 dbV input,
upper: 6.6 V output at -4 dbV input
40 ms
f l u t
40 ms
time