The noise envelope module – Applied Acoustics Systems Chromaphone 3 Upgrade Acoustic Object Synthesizer Plug-In (Download) User Manual

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5.3

The Synth Section

resonator A and hence the frequency of its fundamental and partials depending on the settings of
resonator B. In other words, one starts to hear resonator B more and more in the final sound. The
amount of coupling or balance (in the case where they are in parallel mode) between the resonators,
can be modulated with the pitch of the note played with the

Key

control.

5.3.6

The Noise Envelope Module

This module is an envelope generator used to modulate the amplitude of the noise

source as well as its

Frequency

and

Density

controls. The envelope generator can be op-

erated in ADSR or AHD mode. The

Type

drop-down control is used to select between

these options.

In ADSR mode, the envelope is divided in four phases:

Attack

Decay

Sustain

and

Release

as illustrated in Figure 24. During the attack phase, the envelope signal goes

from a value of zero to a value of 1 in a laps of time controlled by the

knob. The decay

phase then begins and the signal goes from 1 to the sustain value of the signal in a laps
of time controlled by the

knob. The level of the sustain portion of the modulation

signal is adjusted using the

knob. This value is held as long as a note is depressed.

Upon release of the note, the signal then decreases from its sustain value to zero in a
laps of time controlled by the

knob. If the note is released during the attack or decay

phase, it will switch to the release phase and decay to zero. The

Delay

knob of this module is used

to add a delay between the triggering of a note and the start of the envelope. This is useful to add
noise to the excitation signal following the initial impact noise from the

Mallet

module.

The AHD mode is used to create envelopes for short attack sounds such as in one-shots. In this

mode, the envelope is divided in three phases:

Attack

Hold

, and

Decay

as illustrated in Figure 25.

Once triggered, the complete envelope signal is generated even if the note is released before the
end of the envelope itself. During the attack phase, the envelope signal goes from a value of zero
to a value of 1 in a time interval controlled by the

knob. The envelope signal then remains at this

peak value during a time determined by the

knob. The signal then decreases from this value to

zero in a lapse of time controlled by the

knob.