APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Instrukcja Użytkownika Pobierz pdf (Strona 34)

34 Parameters

Amplitude (dB)

Frequency (Hz)

F1 F2 F3

Male Voice

Female Voice

Formant Frequencies

Figure 18: Frequency response of the formant ﬁlter.

all the vowels. The effect of the Cutoff knob on the formant ﬁlter is to offset all the formants by

the same factor and it is used to switch between male voice (left position), female voice (center)

and child (right position). The Q knob is used to cycle between vowels. Note that changing these

parameters can be automated by using the different modulation signals.

4.2.9 The Envelope Module

The Filter Env envelope generator module is based on a standard ADSR

(attack, decay, sustain, release) approach including velocity modulation.

The envelope module generates a four-segment envelope: attack, decay,

sustain, release. The attack time is adjusted using the A knob. The attack time

can also be modulated with the velocity signal received from the Keyboard in

such a way that that the higher the velocity signal the shorter the attack time

will be, the intensity of this effect being controlled using the modulation knob

below of the A knob. When the knob is in its leftmost position, the attack

is only determined by the value of the A knob, turning the knob clockwise

will increase the inﬂuence of the velocity signal until the attack time is strictly

determined by the inverse of the velocity signal when V reaches its maximum

value. The decay time is set with the D knob. The sustain phase of the envelope generator lasts

from the end of the decay phase until the key is released. When the S knob is fully turned to the left,

the sustain level is zero and there is no sustain phase while fully turned to the right, the sustain level

is at maximum and there is no decay phase. Note that the sustain phase can also be modulated with

the velocity signal from the keyboard. Finally, when the key is released, the envelope generator

toggles to the release phase and the envelope signal decreases from its sustain level to zero in a

time set by the R knob.

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APPLIED ACOUSTICS SYSTEMS STRINGSTUDIO Instrukcja Użytkownika Strona 34