Manual AAS Tassman 4 (page 69 of 177) (English)

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6.2 ADSR 69

6.2 ADSR

The ADSR is an envelope generator. It uses a gate signal for input and

generates an output envelope signal. An envelope is a time varying signal

having a value between 0 and 1 Volt. It is divided into four, the Attack, Decay,

Sustain and Release which can be adjusted as shown in Figure 2. The attack

is triggered by an input signal exceeding a threshold value of 0.1 Volt. During

this phase, the output signal goes from 0 to 1 Volt during the time set by the

Attack knob. When the output reaches 1 Volt, the decay phase begins, and the

output signal decreases from 1 Volt to the sustain level during the time set by

the Decay knob. The sustain level, set by the Sustain knob, is then held until

the input signal drops to less than 0.1 Volt. The output signal then decreases

to 0 Volt during the time set by the Release knob. The red LED beside each knob indicates the

current phase of the output envelope. Finally, the lin/exp switch is used to determine the shape

of the different segments of the envelope which can be either linear of exponential. Note that in

Figure 27 the segments are exponential.

attack decay release

sustain

key pressed key released

1Volt

Figure 27: ADSR response curve

The default value of the following parameters is set during construction

• Attack: duration, in seconds, of the Attack phase.

• Decay: duration, in seconds, of the Decay phase.

• Sustain: level, in Volts, of the sustain phase.

• Release: duration, in seconds, of the release phase.

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AAS Tassman 4 Manual

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