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Update audio

Håvard O. Nordstrand 5 年之前
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共有 1 個文件被更改,包括 3 次插入4 次删除
  1. 3 4
      audio-video/audio/basics.md

+ 3 - 4
audio-video/audio/basics.md

@@ -12,11 +12,10 @@ breadcrumbs:
 
 ## Notes
 
-- Line levels:
+- Signal levels:
   - +4dBu: Professional equipment.
-  - -10dBV: Consumer equipment. Lower than +4dBu.
-  - dBv
-  - dBm
+  - -10dBV: Consumer equipment. Lower than +4dBu. Not to be confused with dB**v**.
+  - Phono: Old, for turntables etc. Much lower voltage than line level. Typically needs a phono preamp/stage with RIAA equalization.
   - Not to be confused with SPL dB.
 - Balance mode:
   - Unbalanced: Ground and signal.