showstack / glossary / slew-rate
Slew rate 擺率
How fast an amplifier’s output can change, quoted in volts per microsecond. Below what a transient demands, a fast edge emerges as a ramp: a distortion that is a limit in time rather than in level, and that sounds like smearing rather than the hardness of clipping. Rarely the limiting factor in a modern amplifier and useful mainly as the one specification describing a temporal failure.
中文
擴大機輸出電壓的最快變化速率，以每微秒多少伏特表示。若低於暫態訊號的需求，急促的邊緣會被 輸出成斜坡：這是一種發生在時間軸而非位準上的失真，聽感是模糊塗抹，而非削波那種硬質感。在 現代擴大機上鮮少成為限制，其主要價值在於它是唯一描述時間性失效的規格。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | Slew rate | |
| HK / TW | 擺率 / 迴轉率 |
Easy to get wrong
Slew limiting is not clipping. Clipping is a ceiling on level and flattens peaks; slew limiting is a ceiling on rate and rounds edges, and it can occur well below full output.
Sources
- AES standards for audio engineering — Audio Engineering Society primary
Understand the mechanism
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