Reducing booming

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LivingInternet
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Re: Reducing booming

Post by LivingInternet » Tue May 11, 2021 2:02 pm

It's pretty close...
limiter.png
limiter.png (16.61 KiB) Viewed 219 times

kozikowski
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Re: Reducing booming

Post by kozikowski » Tue May 11, 2021 2:49 pm

Cool. As soon as I get rolling, I'll post the complete process.

Koz

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Re: Reducing booming

Post by kozikowski » Tue May 11, 2021 8:08 pm

Mastering is a three-step process. You are urged to take the steps in order, don't add any in the middle, and don't leave any out. It is a Suite, a harmonious grouping. They clean up after each other.

After you set all this up, the tools and settings stick and it should be possible to rip through them quickly for each chapter or video.

-- The first step is the Low Rolloff or High Pass Filter depending on which direction you start from. It suppresses rumble and some bass notes. This is important because many home systems have rumble (thunder) and bass distortion that has nothing to do with the voice or the show. Further, rumble messes up the other two tools.

-- Set the RMS (loudness). This is straight out of the audiobook publication. RMS (loudness) should be between -23dB (quiet) and -18dB (louder). The tools are normally adjusted for -20dB (in the middle).

-- Tame the Peaks. It's not unusual for the tips and peaks of the blue waves to get too high after you set loudness. The Limiter gently and gracefully pushes the peaks back down without it being obvious what it's doing.

That's it. If everything goes well, the result conforms to the audiobook standards, is usually louder, and sounds exactly like you.

Note that noise isn't listed anywhere in there. Noise is the college level course and is the reason we urge, strongly, that you record in a quiet, echo-free room. If you don't, you can spend a very long time trying to "clean up" the damage.

In this particular case, I used one of the segments of background sound as Effect > Noise Reduction > Profile. Then apply the small noise correction. Select the whole show, Effect > Noise Reduction > 6, 6, 6 > OK.

~~

You will probably have Effect > Equalization.

Steve wrote a bass curve which is cousin to the one that broadcasters and podcasters use in the field with their microphones to get rid of traffic, jets, thunder, and other low rumbly noises.

LF_rolloff_for_speech.xml
(299 Bytes) Downloaded 6 times

Effect > Equalization > Save/Manage Curves > Import > LF_rolloff_for_speech.xml.

If everything goes well, you should get a picture that looks like this.

Screen Shot 2021-05-11 at 12.48.48.png
Screen Shot 2021-05-11 at 12.48.48.png (81.29 KiB) Viewed 190 times

I need to drop for a while.

Koz
Attachments
rms-normalize.ny
(809 Bytes) Downloaded 4 times

kozikowski
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Re: Reducing booming

Post by kozikowski » Tue May 11, 2021 10:08 pm

In the last message, there was an attachment called rms-normalize.ny. Download that and install it in your Audacity. This is where it could get sticky. Have you ever installed a plugin to your Audacity? I know exactly how to do it...on a Mac. Your built-in instructions should help.

The target for the plugin is -20dB, not the default -18dB.

Screen Shot 2021-05-11 at 14.41.41.png
Screen Shot 2021-05-11 at 14.41.41.png (28.56 KiB) Viewed 185 times

~~

The last step is setting up Effect > Limiter.

That should look like this.

Screen Shot 2021-05-11 at 14.45.47.png
Screen Shot 2021-05-11 at 14.45.47.png (37.24 KiB) Viewed 185 times

As I posted earlier, you pace through these three the first time and make sure the settings are right. After that, the settings stick (unless you change them) and it should be:

Effect >Equlization > OK,
Effect > RMS-Normalize > OK,
Effect > Limiter > OK.


These tools were designed at the early days of the audiobook crush. They got a lot easier over time. The last version in Audacity 3.0.2 is automated.

Tools > Apply Macro > Audiobook-Mastering-Macro

That's it. That's the whole thing. A Macro is a tool that runs other tools—but it does depend on the latest Audacity.

Let me know if you get stuck and where. Since you got your noise and echo problems licked, it pretty much doesn't make any difference which Audacity you use. Whole worlds open up. This is why people use studios.

Koz

LivingInternet
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Re: Reducing booming

Post by LivingInternet » Tue May 11, 2021 10:36 pm

Fascinating. I shall digest and return.

LivingInternet
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Re: Reducing booming

Post by LivingInternet » Wed May 12, 2021 9:09 pm

Ok, I think I got it. Three q's:

1. I'd like to apply the change pitch effect to deepen the voice a bit. I assume I would do this first?

2. Trebor mentioned mic clicking. I also assume I would apply declicking before the three mastering steps?

3. I have found the builtin equalization "100 Hz Rumble" useful. Interestingly, at least to me, I found that it removed plosives, from a time when I did not have a mic filter and the mic was too close. The curve is below. Would you recommend using Steve's "LF_rolloff_for_speech" filter instead?
100HzRumble.png
100HzRumble.png (37.21 KiB) Viewed 164 times

kozikowski
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Re: Reducing booming

Post by kozikowski » Wed May 12, 2021 11:48 pm

Low-Rolloff allows more natural sound to go through than 100Hz Rumble. It's more gentle to male announcers with low voices.

The Rumble Filter follows the convention that the name of the filter reflects the half-power point. At 100Hz, the Rumble Filter is already running and reducing volume. In Low Rolloff, 100Hz is still at normal volume and the show volume drops more sharply as the pitch goes down.

You are entering the low-pitch fist-fight. I don't know that I have a recommendation. If you move your voice down in pitch before either of those filters, they will defeat some of the effect. I would forget the pitch shift, particularly because Effect > Change Pitch is one of the effects that can cause some sound damage. You should not go there. Whatever you do should be consistent for any one client which could give you bookkeeping problems, and it should not use a special effect that only exists in one place.

"I like your voice and I want you to do some work.....in our studio." Ummm... Well...shucks.
declicking before the three mastering steps?
Yes, because clicking can throw off some of the other tools. Do you know why you're clicking? Is it something that can be fixed at the microphone level? My favorite problem is mouth noises. I have Tongue Ticks recognized as hazardous by the State of California. Is this a mouth noise?

Koz

kozikowski
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Re: Reducing booming

Post by kozikowski » Wed May 12, 2021 11:51 pm

Also, you're not booming any more. That problem vanished with the shiny walls and the echoes. As I posted, all of those rescue tools can go away.

Koz

LivingInternet
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Re: Reducing booming

Post by LivingInternet » Thu May 13, 2021 1:18 am

Also, you're not booming any more. That problem vanished with the shiny walls and the echoes. As I posted, all of those rescue tools can go away.
Yes, this is a great improvement indeed.
Do you know why you're clicking?
Unfortunately, no. For the raw audio tests, the NTG3 was on a solid stand, about 10 inches high. So I'm guessing it is me. Is the clicking still there? I'm not sure I can hear it myself: download/file.php?id=31669

kozikowski
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Re: Reducing booming

Post by kozikowski » Thu May 13, 2021 1:57 am

I'm not sure I can hear it myself:
Now you're scaring me. Audacity doesn't work in the subjunctive mood.

"We might require click removal had the clicks been audible."


You posted a mono (one blue wave) track. If you post mono, you can announce out to 20 seconds before the forum cuts you off. Post a WAV file of you reading one of your own works in the way you would want to present it to a customer/client. Leave one clean second at the top instead of two.

Koz

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