Sustain Control Circuitry - SPL Transient Designer 2715 User Manual

Technology
20
Attack Control Circuitry,
Diagram 2: Calculated Control Voltage (Attack)
U/mV
Diagram 2 shows the difference between Env 1 and Env 2 that defines
the control voltage of the VCA. The shaded area marks the difference
between Env 1 and Env 2 that controls the control voltage of the VCA.
The amplitude of the attack is increased if positive ATTACK values are
set. Negative ATTACK values reduce the level of the attack transient.
Diagram 3: Processed Waveforms (Attack)
U/V
Maximum Attack
Minimum Attack
Diagram 3 displays the processed waveforms with maximum and mini-
mal ATTACK to compare against the original waveform in diagram 1.
The SUSTAIN Control Circuitry
The SUSTAIN control circuitry also plays host to two envelope genera-
tors. The envelope tracker Env 3 again follows the original waveform.
The envelope generator Env 4 maintains the level of the sustain on the
peak-level over a longer period of time.
The control voltage of the VCA is again derived from the difference
between the two voltages. Sustain amplitude is increased for positive
SUSTAIN settings and reduced for negative settings.

Sustain Control Circuitry

Difference Env 1-Env 2
(Equals VCA Control Voltage)
Original Waveform
RackPack: Transient Designer
t/ms
t/ms