Acoustics

ADSR Envelope (2)

The Music Telegraph | Text 2019/08/05 [15:43]
Acoustics

ADSR Envelope (2)

The Music Telegraph| 입력 : 2019/08/05 [15:43]

▲ Figure 1: An ADSR envelope (Attack, Decay, Sustain, Release) applied to an arbitrary sound sequence. The linear variation of the amplitude is above, in blue. Below the amplitude variation is exponential.

© ResearchGate.net

 

 

 

ADSR Envelope (2)

 

Generally, when a musical instrument's sound is generated, it takes some time to reach the maximum volume level. The sound does not disappear immediately after the instrument reaches the maximum level, but the sound disappears gradually after the level is maintained for a while. Figure 1 (above picture) shows the temporal change process of the volume that gradually disappears from the sound generation. In this way, the process of amplitude change of the sound over time is called 'Envelope', and envelope is classified into four parts: Attack, Decay, Sustain, and Release. It is also called 'ADSR' by combining the first letter of each of these. Attack represent a rising process to reach the maximum volume level after the sound is generated. The process from the maximum level of sound to Sustain is called Decay. Sustain is the process of maintaining the steady state of sound. The process of the sound disappearing is then called Release.

 

 

1. Attack is the most influential factor in the clarity of musical instrument sounds among the components of Envelope. 

 

2. Release is an important factor in perceiving the reverberation of musical instrument sounds.

 

3. Attack has the greatest influence on the tone of the instrument among the components of Envelope.

 

4. Violin, harp, and symbals are typical instruments with long Release in its Envelope.  

 

5. Drums, piano, and xylophone are typical instruments with fast Attack.

 

 

 

 

 

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