intermittent background noise

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intermittent background noise

Permanent link to this post Posted by Quantum » Thu Jan 18, 2018 2:38 am

Hello
I've been using Audacity with my Blue Yeti Pro mic for a few years now.

In my audio recordings, I often get an intermittent background noise under the same recording conditions with the mic open, which is difficult to get rid of and impossible to predict. Even when I do the recording on the same day - one segment is clear and the next could have this noise.

My first question is - could someone offer an insight whether this is a mic OR Audacity related issue?

On the mic, I have a very small dB gain - and still need to speak very close to the mic, so can't reduce it to zero or to the negative setting.

and two - when I tried to fix the voice track with the Noise Reduction feature in Audacity - I quickly abandoned it as even a small fix significantly reduces the dB loudness of the voice recording - which I need to put in a lot of effort to anyway, to have it at the right level.

I would be grateful for any insight and hopefully a solution.

thanks !
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Re: intermittent background noise

Permanent link to this post Posted by kozikowski » Thu Jan 18, 2018 5:46 am

I often get an intermittent background noise

You gotta know the first thing we're going to ask you is to post a sample of the noise. I hope you didn't throw them all out.

Regardless of the instruction options, post WAV format.

viewtopic.php?f=49&t=72887

Koz
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Re: intermittent background noise

Permanent link to this post Posted by Quantum » Fri Jan 19, 2018 6:19 am

thanks - the file is attached.

additional info - I have a pop filter (sock) on the mic. I was having those noise issues in the past before I started using the pop filter.

PS I haven't received an email notification that there is a reply to my post. Was I supposed to get it or do we just need to check on the Forum?

thanks
Anna
Attachments
noise sample 19 Jan.wav
(1.31 MiB) Downloaded 12 times
Quantum
 
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Re: intermittent background noise

Permanent link to this post Posted by Quantum » Tue Jan 23, 2018 6:06 am

..has anyone had a chance to look at my attachment....?
i'm about to start a new production...facing the same noise problem.,..

any advice on how to elimiate this noise (even just based on experience from the many of Audacity podcasters) would be much appreciated.

THANKS!
Quantum
 
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Re: intermittent background noise

Permanent link to this post Posted by Quantum » Tue Jan 23, 2018 6:13 am

how many posts does it take to be able to post them here without moderation... which takes few days...?

I must say I feel like being in a kindergarten not being trusted to do anything without supervision..... which is NOT conducive to engaging on this forum.

Forum moderation is an outdated approach. It is highly discouraging egagement.

after all...I am a well mature adult, a professional business person, with a registered business In Australia ( Australian Business Number (ABN) 62759173306 ), have my own website [advert removed].

What could I possible say on this forum that would be unecceptable??
Quantum
 
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Operating System: Windows 8 or 8.1

Re: intermittent background noise

Permanent link to this post Posted by steve » Tue Jan 23, 2018 1:42 pm

Unfortunately we had to introduce post moderation for new users because we were being flooded with literally hundreds of spam posts per day (despite having email and capture verification). Although the inconvenience to new users is regrettable, the vast majority of our users appreciate the benefits of this forum remaining a safe and spam free corner of cyberspace.
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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Re: intermittent background noise

Permanent link to this post Posted by steve » Tue Jan 23, 2018 2:08 pm

Quantum wrote:On the mic, I have a very small dB gain - and still need to speak very close to the mic, so can't reduce it to zero or to the negative setting.

Sounds like you are doing everything right, but I agree that the background noise is a bit high.

Audacity does (intentionally) add a little bit of noise to exported tracks. This is called "dither noise", and it (surprisingly) improves the dynamic range of the recording by preventing "quantization noise". The first half second of your audio clip has this "dither noise", which I think you will agree is quiet enough to not be a problem.

The noise that starts at about 0.8 seconds into the clip, sounds like "pre-amp noise". For USB microphones, the pre-amp is built into the mic. It doesn't look or sound to me like something that could be coming from Audacity.

Quantum wrote:I often get an intermittent background noise under the same recording conditions with the mic open

That's a bit worrying. Being intermittent suggests that it may be a hardware fault.
Does the problem come and go during a recording, or is it that one day the noise is there and the next day it isn't?

It could be something as simple as dirty or worn contacts in the microphone's input level control, in which case you may just need to turn that control up and down a few times to "clean" the contacts. If this is the problem, then it could be a sign that the mic is on its way out.
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Re: intermittent background noise

Permanent link to this post Posted by kozikowski » Tue Jan 23, 2018 4:08 pm

Or are you talking about that little boost in noise at the seven second mark? In any event, I have been able to get significant improvement by applying the rumble filter and noise reduction. Attached.

I think the background noise is from a motor, air conditioner, heater or other noisemaker in the room with you. You also have contradictory conditions. You claim a business in Australia, but there is a significant portion of the noise at 120Hz which is a signature of recording in the US or other 60 Hz power country.

Are you recording in the US?

I got your noise improvement by Effect > Equalization: Low Rolloff for Speech, Length about 5000; followed by Noise Reduction 9, 6, 6. Neither of those affects your voice quality.

Let us know.

Koz
Attachments
relax-patched.wav
(1.31 MiB) Downloaded 6 times
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Re: intermittent background noise

Permanent link to this post Posted by kozikowski » Tue Jan 23, 2018 4:23 pm

If you listen very carefully, does your computer fan go on and off on occasion? Once you identify room noises, it's something of a zoo to figure out where it's coming from.

If you're close-talking to the Yeti Pro and you're reading from the computer screen, that means everything is scrunched together in a very small spot. I have a laptop that switches the fan on and off and the only way I knew it was happening was I pushed my ear up to the hinge once when it was running. It's behind the ESC key upper left.

Do you have a tablet to use for reading or can you print the scrips and read it that way? Stretch the USB cable out to its max length (do not extend it) and put a pillow or towel rolled up between the machine and the microphone.

Also I use a heavy blanket over the whole desk for noise abatement.

Koz
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Re: intermittent background noise

Permanent link to this post Posted by kozikowski » Tue Jan 23, 2018 4:29 pm

Ignore everything but the furniture moving pad doubled over on the table. That was a radio broadcast I shot.

Image

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