关于RME Fireface UC 最佳回放的设置
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[1 楼] 若是今 [泡菜]
12-3-6 23:29
兄弟买的音频接口,Fireface UC,其中讲回放设置的部分,为了最好的回放效果需要和后端设备(功放或者前级)匹配,需要设定参考电平?兄弟没有任何这方面基础,英文也不灵,搞不明白,大家指点一下。

一点感触:就是有钱买了专业设备,也不一定能够发挥其中的最佳性能。这年头,知识还是很重要的,不但赚钱时重要,娱乐时也重要。

原文:
The headroom of Fireface UC (output part) lies between 9 and 15 dB, according to the chosen reference level:


Reference 0dBFS@ Headroom
Hi Gain +19 dBu 15dB
+4dBu +13dBu 9dB
-10dBv +2dBV 12dB


With +4 dBu selected, the according headroom meets the latest EBU recommendations  for Broadcast usage. At -10 dBV a headroom of 12 dB is common practice, each mixing desk operating at -10 dBV is able to send and receive much higher levels. Lo Gain is best suited for professional users who prefer to work balanced and at highest levels. Lo Gain provides 15 dB headroom at +4 dBu nominal level.

我的理解是FF UC的输出“动态余量”在9-15 dB之间,通过如下表可选择:

当选择+4 dBu的档位的时候,动态余量可满足最新的EBU针对广播应用的建议标准。通常所选择的 -10 dBV 会有12dB的动态,基于此当的混音操作可以发送和接受更高的电平。低增益是最适合那些希望使用平衡传输和最高水电平的专业用户。 低增益提供了在+4dBu基础的名义上15dB的电平。

我的问题是:

这个英文最后两个“Lo Gain”有没有印错?这段中文是否和英文对应,以及英文和中文都是什么意思?

最后,如果希望获得最佳音质,应该选择哪个档位? 本帖最后由 若是今 于 2012-3-6 23:38 编辑

[4 楼] 若是今 [泡菜]
12-3-7 10:45

搞明白了一点,多谢Bohnenkaffee!

我在交流里面发的帖子,有老兄说这个表格可能印错了。看来德国人干活也不靠谱啊。
反正我这面知道了,应该选择+4dB这个档位。
[3 楼] Bohnenkaffee [陈年泡菜]
12-3-7 02:22
Hi/Lo Gain应该是高/低增益,应用的时候看需求。

比如说我的耳放电路是三种增益(放大系数)可调,我目前调整在10db。小了声音小,大了有太大,可以配合其它适合的前段器材。 本帖最后由 Bohnenkaffee 于 2012-3-7 02:35 编辑

[2 楼] Bohnenkaffee [陈年泡菜]
12-3-7 02:14
不懂,上张图参考一下。Headroom in digital audio

In digital audio, headroom is defined as the amount by which digital full scale (FS) exceeds the permitted maximum level (PML) in dB (decibels). The European Broadcasting Union (EBU) specifies a PML of 9 dB below 0 dBFS (-9 dBFS), thus giving 9 dB of headroom. An alternative EBU recommendation allows 24 dB of headroom, which might be used for 24-bit master recordings where it is useful to allow more room for unexpected peaks during live recording.

Failure to provide adequate headroom can bring about clipping of brief, higher-level transients.

Headroom in analog audio

In analog audio, headroom can mean low-level signal capabilities as well as the amount of extra power reserve available within the power amplifiers that drive the loudspeakers.

本帖最后由 Bohnenkaffee 于 2012-3-7 02:17 编辑