ENSONIQ DP/2 Specifications download pdf (Page 54)

Section 2 — Algorithms

38 ENSONIQ DP/4+ Reference Manual

EXPANDER

Expander performs downward expansion of an input signal’s dynamic range. For high

expansion ratios this algorithm functions as a gate. This algorithm operates by reducing the level

of signals below the threshold and passing the signals above the threshold. The Threshold is a

definable parameter. This algorithm can be used to eliminate noise. There is no EQ in the audio

path; high and low pass filtering are provided on the side chain only. This algorithm possesses

two special features:

1. The ADSR (envelope generator) in this algorithm has Attack, Sustain, and Release (the

sustain is new and is called the Hold Time).

2. This algorithm contains a trigger mask function. This function is used primarily to extract a

click track from drum tracks. Once triggered, this function inserts a zero signal level into the

side chain detector for an amount of time determined by the user. This function becomes

triggered if Trigger Mask is enabled and if side chain signal falls below the Trigger Mask

Threshold.

Threshold

Time

Signal Level

Pass

Attenuate

01 — Mix

02 — Volume

See the descriptions under the Mix and Volume Parameters, in the beginning of this section. We

recommend a setting of 99.

03 — Exp Ratio Range: 1:1 to 1:40, infinity

Sets the amount of expansion. The range is based on decibels (dB) below the threshold. If this is

set to 1:4 for example, it will expand changes in signals below the threshold by a factor of four.

When this is set to infinity, it acts as a gate. A setting of 1:1 offers no expansion.

04 — Exp Threshold Range: -96 to +00 dB

This parameter sets the threshold level. Signals that exceed this level will be unaffected, while

signals that are below will be expanded. To turn off the expander, set the level to -96 dB.

05 — Gain Change Range: N/A

This read-only parameter displays the amount of gain reduction in real time.

06 — Exp Attack Range: 50µs to 100ms

Determines the attack rate after the initial signal has been detected and before the expansion

takes affect.

07 — Exp Release Range: 1ms to 10.0s

Determines the release rate after the signal has been detected below the threshold level. This is

generally chosen longer than the attack time (parameter 06).

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ENSONIQ DP/2 Specifications Page 54