showstack / glossary / vca
VCA 壓控放大器
A voltage-controlled amplifier: a gain stage set by a control voltage rather than by a knob in the signal path. It lets a fader carry DC instead of audio, which is what a VCA group is. Pulling a VCA group down offsets each member channel’s own gain, so their sends and inserts scale with them and no extra amplifier is inserted into the audio.
中文
壓控放大器：增益由控制電壓決定，而非由訊號路徑上的旋鈕決定的增益級。它讓推桿傳送直流控制 電壓而非音訊，這正是 VCA 編組的原理。拉下 VCA 編組推桿等於同時偏移各成員聲道自 身的增益，因此其送出與插入點都會跟著變化，音訊路徑上也不會多出一級放大器。
Regional usage
| Where | Term | Note |
|---|---|---|
| UK / US | VCA | |
| HK / TW | VCA | Said in English. 壓控放大器 appears in writing, almost never on headset. |
Easy to get wrong
A VCA group is not a subgroup. A subgroup sums audio onto a bus; a VCA group sums nothing and only offsets gain. A post-fade send follows one and not the other.
Sources
- AES standards for audio engineering — Audio Engineering Society primary
Understand the mechanism
Something wrong, or missing?
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