Equalizers and Filters
先存着，过几天来翻。
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Equalizers and Filters
Just a quick note on this involved topic! An equalizer lets you raise or lower your signal in certain frequency bands, i.e. you can increase the lower end (add bass), the middle band (add presence) or the upper band (increase brilliance). But (IMHO) that does not really work!
Why? First of all, most digital eqs are not really "selective" enough to influence the exact region you want to influence. They tend to be too "broad" and not "steep" enough to be really useful (waiting for hate mail!!).
Note: From our experience, it's especially dangerous to boost the treble range (above 1000Hz) of your recording with a broad equalizer. Especially when you use an older mp3 encoder, you will suffer from this decision, because it might add noise and other audible "artefacts" to the result based on this operation!
On the other hand, "digital filters" (a more sophisticated version of equalizers) are sometimes a blessing! This is especially the case when working though material that has been recorded live on a stage with all kinds of power and signal cables crossing each other, or if you record back home sitting next to your computer with your room or table light on. The point is that power (AC!) comes with a certain frequency: 60 Hz in the USA, 50 Hz in other parts of the planet. This is the low-pitched hum that's creeping up your recordings!
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This is the graphical display of a 60/120 Hz "notch" filter that very selectively erases these frequencies (US settings!). Oh, why the 120Hz, too? Because any 60Hz signal also contains some 120Hz parts (the 8th or "octave"). Too hard to explain here, just believe it, ok?
It's always a good idea to carefully listen to your raw recording and spot those "power hums". If you detect some, use such a special filter to remove it (but don't forget to check the result with the best audio test devices available: Your ears!).
http://www.farland-music.com/audio/filtering.html
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Equalizers and Filters
Just a quick note on this involved topic! An equalizer lets you raise or lower your signal in certain frequency bands, i.e. you can increase the lower end (add bass), the middle band (add presence) or the upper band (increase brilliance). But (IMHO) that does not really work!
Why? First of all, most digital eqs are not really "selective" enough to influence the exact region you want to influence. They tend to be too "broad" and not "steep" enough to be really useful (waiting for hate mail!!).
Note: From our experience, it's especially dangerous to boost the treble range (above 1000Hz) of your recording with a broad equalizer. Especially when you use an older mp3 encoder, you will suffer from this decision, because it might add noise and other audible "artefacts" to the result based on this operation!
On the other hand, "digital filters" (a more sophisticated version of equalizers) are sometimes a blessing! This is especially the case when working though material that has been recorded live on a stage with all kinds of power and signal cables crossing each other, or if you record back home sitting next to your computer with your room or table light on. The point is that power (AC!) comes with a certain frequency: 60 Hz in the USA, 50 Hz in other parts of the planet. This is the low-pitched hum that's creeping up your recordings!
This is the graphical display of a 60/120 Hz "notch" filter that very selectively erases these frequencies (US settings!). Oh, why the 120Hz, too? Because any 60Hz signal also contains some 120Hz parts (the 8th or "octave"). Too hard to explain here, just believe it, ok?
It's always a good idea to carefully listen to your raw recording and spot those "power hums". If you detect some, use such a special filter to remove it (but don't forget to check the result with the best audio test devices available: Your ears!).
http://www.farland-music.com/audio/filtering.html
别烦您老了，我来代庖吧：）
均衡器与滤波器
关于此话题相关的一个提示！均衡器可以让你在某段频率内升高或降低信号，即可以降低低音部，中频波段（增加现场感）或者是高音部（增加亮度）。但是，我也直说了，其实它并不这样工作！
为什么？首先，大多数的数字均衡器并不真是有“选择性”很充分的，能够影响到恰好想编辑的区域频率的功能。看起来它们有点宽而不是紧，所以不能够充分真正有用（我就等着那讨厌的邮件了！！！！）
提示：根据我们的经验，特别是用宽属性的均衡器来提升高你录音的高音部范围声音时（1000赫兹以上）特别危险。特别是当你使用一个老式的MP3编码器，你就会遭受这个结果，因为它或许会增加噪音或其它可以听到的“赝品”——如果你这样操作的话！
另外一方面，“数字滤波器”（均衡器更为复杂的版本）有时倒是一份厚赠！特别处理在当舞台上各种电源线与信号线串来串去时录的现场声音时，或者是在你家里靠近电脑旁录的东东时。要点在于电源（AC！）带有某些频率：美国的是60赫兹，在其它地方可能是50赫兹。这是一种低音的哼声，对你的录音有一定影响！
这是一个60/120赫兹的“notch”滤波器的图形显示，而它则有选择性地擦除了这些频率（美国设置！）。哦，为什么120赫兹也要搞啊？因为60赫兹中也包含了一些120赫兹的部分（八度的意思）在这里很难解释，只要相信它就行了，行不行？
仔细听你的原始录音，并且发现这些“电源哼声”，这始终是一种很不错的方法。如果你检测出了一些的话，使用诸如此类的滤波器来移除它（但是别忘了用最好的音频测试设备来检测：你的耳朵！）
均衡器与滤波器
关于此话题相关的一个提示！均衡器可以让你在某段频率内升高或降低信号，即可以降低低音部，中频波段（增加现场感）或者是高音部（增加亮度）。但是，我也直说了，其实它并不这样工作！
为什么？首先，大多数的数字均衡器并不真是有“选择性”很充分的，能够影响到恰好想编辑的区域频率的功能。看起来它们有点宽而不是紧，所以不能够充分真正有用（我就等着那讨厌的邮件了！！！！）
提示：根据我们的经验，特别是用宽属性的均衡器来提升高你录音的高音部范围声音时（1000赫兹以上）特别危险。特别是当你使用一个老式的MP3编码器，你就会遭受这个结果，因为它或许会增加噪音或其它可以听到的“赝品”——如果你这样操作的话！
另外一方面，“数字滤波器”（均衡器更为复杂的版本）有时倒是一份厚赠！特别处理在当舞台上各种电源线与信号线串来串去时录的现场声音时，或者是在你家里靠近电脑旁录的东东时。要点在于电源（AC！）带有某些频率：美国的是60赫兹，在其它地方可能是50赫兹。这是一种低音的哼声，对你的录音有一定影响！
这是一个60/120赫兹的“notch”滤波器的图形显示，而它则有选择性地擦除了这些频率（美国设置！）。哦，为什么120赫兹也要搞啊？因为60赫兹中也包含了一些120赫兹的部分（八度的意思）在这里很难解释，只要相信它就行了，行不行？
仔细听你的原始录音，并且发现这些“电源哼声”，这始终是一种很不错的方法。如果你检测出了一些的话，使用诸如此类的滤波器来移除它（但是别忘了用最好的音频测试设备来检测：你的耳朵！）