16.12 使用ReaFir降低噪音——REAPER用户手册中文版

琴韵晓波

楼主 琴韵晓波说：
16.12 Noise Reduction with ReaFir
16.12 使用ReaFir降低噪音
ReaFir is a multipurpose dynamics plug-in that almost defies categorisation or description. It can act as an EQ, a Compressor, a Noise Gate, and more. In this example, you will see how it can be used for noise reduction. The need for a noise reduction plug-in can arise when an otherwise good track has some unwanted background noise on it. This might, for example, be hiss or rumble, or the sound of an air conditioner. ReaFir can be used to remove such sounds from your tracks in real time. In order to do this, you must first identify a passage on the track (perhaps a second or two) where you have recorded the unwanted noise by itself. This is likely to be at the very beginning of the track.
ReaFir是一个多功能的动态插件,几乎无法分类或描述。它可以充当均衡器、压缩器、噪声门等等。在本例中,您将看到如何将其用于降噪。当一个原本很好的轨道上有一些不想要的背景噪音时,可能会出现需要降噪插件的情况。例如,这可能是嘶嘶声或隆隆声,也可能是空调的声音。ReaFir可以用来实时从你的轨道中删除这样的声音。为了做到这一点,你必须首先确定轨道上的一个段落(可能是一两秒钟),在那里你已经单独录制了不需要的噪音。这很可能是轨道的最开始。
Example and Procedure
示例和步骤
In overview, the procedure is this:
总而言之,该过程如下所示:
1. Insert ReaFir in the FX window of the track containing the recorded items with the unwanted noise.
1.将ReaFir插入包含带有不想要的噪音的录音对象的轨道的FX窗口。
2. Position the play cursor at the start of a passage containing just the unwanted noise.
2.将播放光标定位在仅包含不需要的噪音的段落的开头。
3. Set ReaFir to Subtract mode. Set Edit Mode to Precise.
3.将ReaFir设置为“Subtract(减法)”模式。将“Edit Mode(编辑模式)”设置为“Precise(精确)”。
4. Select the Option Automatically build noise profile.
4.选择“Automatically build noise profile(自动建立噪音剖面图)”选项。
5. Play the track only for the duration of the passage containing the noise, then stop the playback.
5.仅在包含噪音的段落播放轨道,然后停止播放。
6. You should see that ReaFir has built a profile of the unwanted noise. This will be marked with a red line (see above right).
6.您应该看到ReaFir已经建立了不想要的噪音的剖面图。这将用红线标记(见右上)。
7. Now uncheck the box labelled Automatically build noise profile.
7.现在取消选中标记为“Automatically build noise profile(自动构建噪音剖面图)”的复选框。
8. Return the play cursor to the start of the song and play it.
8.将播放光标返回到歌曲的开头并播放。
9. You should now find that as the song plays, the noise that you profiled by following steps 1. to 5. has now been removed from your output.
9.现在您会发现,随着歌曲的播放,您通过步骤1.至5.分析的噪音现在已从您的输出中删除。
ReaFir supports metering in channel sum mode, max mode or selected individual channel mode. These modes are explained in the section covering ReaEQ. Note that your choice of metering options does not affect output. Your choice of channel mode (e.g. multi-mono or multi-stereo) from the right In/Out menu will, however, affect how the audio is processed. Channel modes are explained in the section covering ReaComp. If unsure, accept the default settings.
ReaFir支持在“channel sum(通道和)”模式、“max(最大)”模式或“selected individual channel(选中的单个通道)”模式下显示电平表。这些模式在涉及ReaEQ的章节中进行了说明。请注意,电平表选项的选择不会影响输出。但是,您从右侧“In/Out(输入/输出)”菜单中选择的通道模式(如“multi-mono(多单声道)”或“multi-stereo(多立体声)”)会影响音频的处理方式。通道模式在ReaComp一节中进行了解释。如果不确定,请接受默认设置。
Note 1: ReaFir is suitable for removing a background noise that is fairly constant, such as an electrical hum: a noise gate is better at dealing with occasional noise, such as a vocalist's breathing sounds.
注: ReaFir适用于去除相当稳定的背景噪音,如电嗡嗡声: 噪声门更适合处理偶尔的噪音,如歌手的呼吸声。
Note 2: As with other FX, ReaFir parameters can be automated (see Chapter 18). Moreover, of special interest to screen readers, is an additional automatable parameter, EQ curve offset, which adjusts the gain of the EQ, threshold or noise profile curve.
注: 与其他FX一样,ReaFir参数可以自动化(见第18章)。此外,对于屏幕阅读器用户(读屏族)有一个特别感兴趣的附加可自动化参数——EQ曲线偏移,用于调整EQ、阈值或噪声分布曲线的增益。

琴韵晓波

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