回复 AQR 在 #3 的 pid=3806614 的贴子
在每個產品都會有張
Level Diagram
如PM5D
http://www.yamahacommercialaudiosystems.com/downloads/block_level/pm5d_level.pdf
其他數據在 specifications 都查得到http://www.yamahaproaudio.com/global/en/products/mixers/pm5d/specifications.jsp
發出此帖是要說明 DBFS的多種格式,各位不可不慎!
原帖 由 发烧兔子 于 13-4-16 03:45 发表
dBFS有两个标准，美制是0dBu=-24dBFS,欧制0dBu=-18dBFS. yamaha数字台子都是美制的，所以对千周都是-20dBFS你看到的-30dBFS是YAMAHA的话放输入最大电平(加了26dB衰减之后)。。。
1.不是喔,你看Level Diagram 左邊那邊條的對應
0dBu是對著-30dBfs 而0dBfs是對著 +30dBu
2.http://en.wikipedia.org/wiki/DBFS
dBFS is not to be used for analog levels, according to AES-6id-2006. There is no single standard for converting between digital and analog levels, mostly due to the differing capabilities of different equipment. The amount of oversampling also affects the conversion with values that are too low having significant error. The conversion level is chosen as the best compromise for the typical headroom and signal-to-noise levels of the equipment in question. Examples:[13][14][15]
- EBU R68 is used in most European countries, specifying +18 dBu at 0 dBFS
- In Europe, the EBU recommend that -18 dBFS equates to the Alignment Level
- European & UK calibration for Post & Film is −18 dBFS = 0 VU
- UK broadcasters, Alignment Level is taken as 0 dBu (PPM4 or -4VU)
- US installations use +24 dBu for 0 dBFS
- American and Australian Post: −20 dBFS = 0 VU = +4 dBu
- The American SMPTE standard defines -20 dBFS as the Alignment Level
- In Japan, France and some other countries, converters may be calibrated for +22 dBu at 0 dBFS.
- BBC spec: −18 dBFS = PPM "4" = 0 dBu
- German ARD & studio PPM +6 dBu = −10 (−9) dBFS. +16 (+15)dBu = 0 dBFS. No VU.
- Belgium VRT: 0dB (VRT Ref.) = +6dBu ; -9dBFS = 0dB (VRT Ref.) ; 0dBFS = +15dBu.
[ 本帖最后由 winniedady 于 13-4-16 13:08 编辑 ]
哪天有时间测一下5D的实际输出电压
您提醒的特别好！！！