Universal Audio UAD POWERED PLUG-INS ver.6.1 - Manual (Page 519)

UAD Powered Plug-Ins Manual - 519 - Chapter 52: SPL Transient Designer
Technology
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 processing, noth-
ing 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 volt-
age 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 gen-
erates a voltage (Env 1) that follows the original waveform. The second enve-
lope generator creates the envelope Env 2 with a slower attack envelope.
Figure 171 on page 519 illustrates the original curve and the two created en-
velopes that control the ATTACK processing. Envelope generator Env 1 fol-
lows the original waveform. Env 2 is generated with reduced attack.
Figure 171. SPL Transient Designer Attack Envelopes