RackPack: Transient Designer
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Of course you don‘t have to know how the Transient Designer works in
order to use it. However, since it offers a completely novel signal pro-
cessing, nothing shall be concealed from the more curious users.
Differential Envelope Technology (DET)
SPL‘s DET is capable of level-independent envelope processing and
thus makes any threshold settings unnecessary. Two envelopes are
generated and then compared. From the difference of both envelopes
the VCA control voltage is derived. The DET ensures that both low and
loud signals (pianissimo to fortissimo) are treated the same way.
Both ATTACK and SUSTAIN control circuitries operate simultaneously
and don‘t affect each other.
The ATTACK Control Circuitry
The ATTACK control circuitry uses two envelope generators. The first
one generates a voltage (Env 1) that follows the original waveform. The
second envelope generator creates the envelope Env 2 with a slower
attack envelope.
Diagram 1 illustrates the original curve and the two created envelopes
that control the ATTACK processing. Envelope generator Env 1 follows
the original waveform. Env 2 is generated with reduced attack.
Technology
DET, Attack Control Circuitry
Diagram 1: Generated Envelopes (Attack)
U/V
Env 1
Env 2 (slower attack)
t/ms
Original Waveform
