showstack / glossary / adsr
ADSR ADSR 波封
The four stages of a standard synthesiser envelope: attack, decay, sustain and release. Three are times and one is not. Attack is how long to reach full, decay how long to fall from full to the sustain level, sustain the level held while the key is down, and release how long to fall to silence after it is let go.
中文
標準合成器波封的四個階段：起音、衰減、延持、釋音。其中三個是時間，一個不是。起音是升到最 大值所需時間，衰減是由最大值降至延持位準所需時間，延持是按鍵持續按下期間所維持的位準，釋 音則是放開按鍵後降至無聲所需時間。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | ADSR / envelope | |
| HK / TW | ADSR / 波封 |
Easy to get wrong
Sustain is a level, not a duration. A note that will not stop while the key is held wants a sustain of zero and a decay, not a shorter release.
Sources
- AES standards for audio engineering — Audio Engineering Society primary
Understand the mechanism
Something wrong, or missing?
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