Having a problem with ACX RMS spec

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Having a problem with ACX RMS spec

Permanent link to this post Posted by HLC » Mon Aug 21, 2017 7:39 pm

Audacity version 2.13
Yeti Blue microphone
Windows 10 software on Lenovo computer
One person stand up home-style recording booth with sound blankets

I can pass the Peak level and the Noise Floor tests without any tweaking. The RMS is always off and whatever I do to adjust it puts the other two out.

I'm such a tenderfoot I'm not even sure what to ask. If anyone has the time to help, please use your teacher to grade-school student voice.

Thank you.

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HLC
 
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Mon Aug 21, 2017 9:54 pm

I'm not even sure what to ask.

Close enough. See attached. Sentence 2/3 down.

I had to work at it. You have a number of problems. You can tell your friends you have The Yeti Curse. After I suppressed that, you have very high background noises. I can't stop to do critical analysis right this second, but to get there (all three audiobook values), I had to use moderately stiff noise reduction.

Do you have a desktop computer in the room with you?

Was that clip "raw and clean?' Your voice and then export and post it? No processing?

I like your voice and I think we can get there. ACX doesn't much like heavy processing, so just throwing software at noise problems isn't always a good thing.

There is a "format" for posting voice clips, but yours worked just fine. We need at least one, one-second gap to sense background noises. That's what most people leave out.

http://www.kozco.com/tech/audacity/Test ... _Clip.html

As we go.

Koz
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Mon Aug 21, 2017 10:15 pm

That's your clip fully patched. After I passed it, I applied a little de-esser to take the edge from the "S" sounds.

So that's what a finished presentation sounds like. If you're on headphones, note the whine and rumble sounds before you start talking in the original clip. There is no way to get rid of the whine sound in the studio. That's post production processing.

Are you in the same room with a desktop computer or a loud laptop?

Have you ever installed a custom filter or effect? See how far you get in this manual page.

http://wiki.audacityteam.org/wiki/Downl ... s#download

I attached the Mosquito-Killer4.ny program.

Koz
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by HLC » Mon Aug 21, 2017 10:39 pm

Thank you. You made me sound better than I do in person.

>>Are you in the same room with a desktop computer or a loud laptop?

Yes, the computer is running Audacity, and is a Lenovo AIO. I will move my booth further away, at least as far as I can go since I am tethered to the microphone cord.

>>Have you ever installed a custom filter or effect?

Yes, I read your manual on audio book production and have downloaded and installed all the suggested filters/effects, including the Mosquito-Killer that you created to deal with the Yeti Curse. I read the ACX info on their site and listened to some of the videos, so I know they prefer the least processing possible.

>>Was that clip "raw and clean?' Your voice and then export and post it? No processing?

Yes, that was raw and clean, no processing at all, me and the microphone with the computer apparently humming accompaniment in the background.

I will have to wait to post another version with background noises only. I've missed today's quality recording time period, and it's now noisy time in my neighborhood.

Thank you again for giving me hope that I can do this!
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Tue Aug 22, 2017 1:03 am

We may not need another test if that one was clean.

Can you hear the mosquito whine sound? Here it is following my voice.

http://kozco.com/tech/audacity/clips/US ... neClip.mp3

Turn up the volume a bit when I stop talking. That's the same whine sound you have and from the same microphone. The plain Blue Yeti microphone occasionally doesn't like some computer's USB connection. Once you have that whine sound, you can change it sometimes, but the combination is usually permanent. We went around the barn for months when this problem started to arrive on the forum. "Try a blue USB cable and stand on your left foot."

No dice. Once you have this noise, it's forever with that computer.

But it's not deadly. The heavy designers ripped the noise apart, inspected it and designed a filter to delete the worst of it. That's what Mosquito-Killer4 is. It's a formal filter that anyone can apply as needed.

Please be clear we are also deleting tiny portions of your voice. This is not a completely free get out of jail card. But compared to the noise, anything is better.

I tried as much as possible to engineer a straight-line pathway for mastering. Do this and then do that. Noise is a problem and that's why it's a separate paper.

Let's see if you can get the same results I did.

In your case, open that clip. Select the whole thing by clicking just above MUTE (this should track with the instruction in the paper). Effect > Mosquito-Killer4: 8 > OK.

If you play the clip, the annoying whine sound should be gone, or it was when I did it.

Now you go back to the top of AudioBook Mastering and start down the path. Equalization: Low Rolloff, 5000 Length > OK.
Etc. That's exactly how I did it.

But.

You also have machine, fan, ventilation or some kind of additional room noise in the performance. So when I got to the end of the corrections, it was still too noisy. Back to the noise document and use Effect > Noise Reduction: 9, 6, 6 > OK. Let me know if you have trouble following these shortcuts.

Now I used Analyze > ACX Check and it passed—but not by a whole lot.

Technically, you could present a book like this and go with it (add the DeEsser to tame the harshness), but that's a lot of work at each and every chapter. ACX stresses the chapters need to match, so there is no changing the protocol half-way through.

And this is where it gets sticky. You can't tame the room or fan noises—or even hear them—without getting rid of the whine sound first. So this will be a juggling act.

I'm staring into the middle-distance trying to think of a good, graceful way to do this.

As we go.

Koz
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Tue Aug 22, 2017 1:25 am

Thank you again for giving me hope that I can do this!

I don't think there's any question you have the performance chops for this. I can listen to a story in that voice.
Lenovo

Lenovo makes a bunch of computers. Describe exactly. Model number or name?

Do Not block any ventilation holes or fan pathways. There are cute tricks you can use to get around some of the noise like putting the computer on a well-padded chair facing away from you and then pad the far wall, for example. The computer can breathe freely, but the noise has to go through two blankets to get to you.

The Yeti has a dead spot directly behind it. This is the wrong microphone, but it has the same reception pattern as the yeti.

Image

You would be in the top, in the hot zone announcing down and Objectionable Noise is in the bottom, in the notch, trying to get in and failing. And yes, this works a lot better if the noise doesn't bounce around the room—hint, hint.

DO NOT extend or modify the Yeti USB cable or go through any USB hubs or splitters!!! This is one of the shortcomings of the Yeti. You can't ever get more than one USB cable away from the computer.

Koz
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Tue Aug 22, 2017 1:28 am

They do tell you this in the instructions. You want Cardioid (heart-shaped). Click the picture.

Koz
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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Tue Aug 22, 2017 1:41 am

You did tell us what it was. It's an Aio.

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I have no feeling for how those work, so this is up to you. Listen to try and figure out where the noise is coming from. It may not be coming from your machine at all.

I have a soft spot for furniture moving blankets. I've shot a lot of voices with those. You may just need heavy padding on the desk and behind the machine.

Forget the technology. Look at the table and wall.

Image

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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by kozikowski » Tue Aug 22, 2017 1:44 am

Could the noise be coming up from the table? There's ways around that, too.

Image

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Re: Having a problem with ACX RMS spec

Permanent link to this post Posted by HLC » Tue Aug 22, 2017 1:40 pm

Thank you for such detailed information. I have to be away from the desk today, and will go through these one by one when I return and post the results.

>>Can you hear the mosquito whine sound? Here it is following my voice.

Yes, I hear it loud and clear. Your miracle MosquitoKiller program clears that up beautifully.

>>DO NOT extend or modify the Yeti USB cable or go through any USB hubs or splitters!!!

Definitely will not do this.

>>You want Cardioid (heart-shaped)

I have been using the wrong one. I'll switch to this one instead.

>>Listen to try and figure out where the noise is coming from. It may not be coming from your machine at all.

I think the bulk of the noise is the computer -- I can hear the fan and the processor without any amplification, so I'm sure the Yeti is happily recording those sounds as well.

>>Forget the technology. Look at the table and wall. Could the noise be coming up from the table?

I didn't think about the table, but you are right, it is naked currently. I will add padding there, and report back on all the above. I have also moved the booth farther away from the computer. With these changes, it may be just as well to post a newer recording.

Thank you again for the time you are spending on this. I'll be back, probably tomorrow.
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