如何录制 优质音频

音质越好 = 转录越准确

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Pete Combs, KOMO Radio

Pete Combs

KOMO Radio

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Pete Combs Recording Tips

Intro of capturing great audio

My name is Pete Combs and I'm a reporter for K O M O KOMO radio in Seattle. I've been doing this for about 40 years and my life has basically revolved around gathering audio and putting it on the air.

The gathering audio part is what I want to talk to about because there's a lot you can do to make your audio presentations sound great and to improve the quality of audio for the purpose of transcription. For instance when you're doing phone audio you want to record that on a landline if possible.

Levels and cadence of speech

Speak slowly and make sure that there are no glitches in that landline connection. If there are, do them over again. It doesn't hurt and it could make the transcription a lot more clear. If you're doing it in person, the one thing I tell you, is make sure your levels aren't too high in the digital world.

You can certainly boost levels all day long but when you try to deal with levels that have gone too high and they distort, there's nothing much you can do the audio will just remain terrible. So if you have any doubt about the volume of your recording go low and you can adjust later.

Volume of recording and exact leveling

I usually do my recordings at 4,400 hertz or 44.1, and I use 64 bit audio when I do an MP3. For radio use I usually record MP3s at 44.1 kilohertz and I use a bit depth of 64 kilobytes per second. That's pretty clear. And again the volume is the key here. You don't want to get too loud.

Summary of capturing great audio

Try those as you're making recordings for transcript and if you have any problems remember this: Slow down. The slower you go the easier it is for the computer to figure out what you're saying. I'm Pete Combs. Good luck and happy recording.

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William Smith, Daring creative

William Smith

Daring creative

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Capturing Great Audio

Recording environment advice

How do I capture great audio? The first thing that I try to do is just always record in a quiet space. So obviously you know reducing the noise and you're environment is super important and everyone says that but it's worth mentioning because it's something that you do need to kind of stress on a little bit.

I have a home studio which is just basically a renovated bedroom that I have converted into a place where I record. I took the closet and I kind of put acoustical tiles in there to make it more conducive to recording and I also try when I can to stand up while I'm talking. I just find that get a better sound that way.

Proper microphone techniques

The next thing that I always try to do is observe proper microphone technique. You know you don't want to be too far or too close to your microphone. The closer that you are the more you risk clipping or overdriving the further you are the weaker the vocal will sound. It might sound a little tinny or just distant and that requires you to do more to bring it up and make it sound good in the forefront of the recording.

I spent a lot of time coaching whoever I'm talking to to make sure that they're staying close to the microphone at all times and they're being in a consistent distance away from it.

Microphone suggestion - Shure SMB7

It also doesn't hurt to have good equipment so what I've tried to do is invest in some decent microphones. I use a Shure SMB7 microphone both for myself and for the guest. And I find that they sound really great. I don't have to do a lot to them in terms of processing.

I plug those into a Zoom recorder so I use Zoom H6 and I just find that it does a really great job recording. I've used other audio interfaces in the past and by far this is the best sounding one that I use as my Zoom. So I love to use that.

Editing & cleaning up audio

And then one thing that I like to do is actually edit the podcast you know go in after I've recorded things and take out filler words minimized breath, if I can, remove mistakes, dead air.

You know I'm just kind of clean things up to make things more concise. You know somebody is kind of rambling on and on about something I'll try to shorten it and I find that that does a lot in terms of how people think in terms of the quality of the audio.

Audio clean-up tool suggestions

The more concise that it sounds, the more confident that it sounds by taking out the stammers and stuff you know stutters and stuff like that, it's really helpful. Then I do some audio processing. So I use some plugins. I use one from Izotope called RX Elements and it's a bundled piece of software.

It allows you to take out hums and clicks and just little artifacts that you could find in your audio recording. There's another tool from Izotope that I use called Nectar 2 which has some really cool presets for different types of sounds and so I'll use that once in a while. I'll usually use a compressor to make sure that the audio remains at a consistent level because again it is hard sometimes to get people to stay in the same dynamic range and sometimes you don't want them to.

Sometimes you want them you know depending on what they're talking about. You know if there's excitement you want that to come through but you don't want to overdrive. You know with the sound is for the listener so I use a compressor. And then the final thing that I do is once I bounce down all the vocal tracks and the whole you know podcast basically into an MP3 file, I'll run it through Auphonic which is an online tool.

It's actually a desktop tool as well but most people use it as the online tool, and it's a leveler. And so just make sure that the volume of your podcast is optimized for mobile listening since most people listen to podcasts through mobile.

I found that that does a really good job at keeping you know the volume levels where they need to be. When you plug in earbuds are you putting in your car etc.

So those are the things that I do to get a good sound.

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录制优质音频的一些技巧

尽可能在室内录制

在有风或嘈杂的户外环境中,您应该将大部分音轨放在室内或录音室中录制。如果必须在现场录制,可以使用“防风毛套”、“防风罩”或防风屏来避免背景噪音或风声,这些是专为最大限度减少风噪而设计的毛茸茸的麦克风罩。几乎不可能从音轨中后期剪掉风噪。

搭建录音棚

录制音频的最佳场所是铺有地毯的小房间,并带有墙面装饰(挂画、窗帘等),以避免出现回声特征的刺耳声音。挂满衣服的衣橱是极佳的临时录音棚。

设备至关重要

获得清晰高质量音频的最佳方法是使用独立麦克风而不是内置麦克风。大多数内置麦克风都是全向的,这意味着它们会录下来自各个方向的不必要声音。

单向麦克风是最好的选择。它们的质量几乎可以保证更好,而且您可以移动麦克风以找到拾音的最佳位置。麦克风比许多人想象的要灵敏得多。即使将某些麦克风指向不同的方向,也可以极大地改变拾音量。通常,将领夹式麦克风夹在人的衬衫上会拾取到最直接、最清晰的声音。

靠近,再靠近一点

麦克风离说话者越近越好。您将获得更好的音频质量、更少的背景噪音和更好的声音忠实度。此外,请清晰地发音,就像您在大型礼堂面对观众演讲一样。

以均衡且统一的水平说话

即使有好的麦克风,也不一定能保证录到好声音。麦克风对微小的音量变化可能非常敏感。虽然我们可能不觉得一个人在说话时忽大忽小有什么问题,但这通常会超出麦克风的处理范围。突然的巨大声音可能会导致失真,而一些非常微弱的声音可能根本无法被捕捉到。

检查您的音频

使用耳机立即监测或检查您的音频质量,以确保没有背景噪音。我们的听觉感知常常让我们忽略背景噪音。举个简单的例子:想象一下在一个开着空调的房间里。过一会儿,你就感觉不到它了。但如果它突然关掉,房间现在就会显得异常安静。我们的大脑和听觉能很快适应环境,但会注意到突然的变化。

不幸的是,麦克风的表现并非如此。麦克风会在整个录音过程中拾取所有的额外噪音。当你再次收听时,它会非常明显。这就是为什么在录制数小时的内容之前,始终使用耳机检查音频非常重要的原因。你一定不想返工重录!

结论

拥有高质量音频对于获得出色的转录至关重要。背景噪音、风声、含糊的声音和回声很容易导致音频质量评分过低。在 Sonix,我们的自动转录算法正在分析您的录音。因此,我们非常依赖您。请确保您的录音是在尽可能好的环境中进行的。这样您需要进行的修改数量将会大大减少。

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