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Random pops during playback

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Tony Trabucco
Random pops during playback
on Sep 20, 2017 at 11:22:04 pm

I am using 3 "Shure SM7B" mics that are connected to a Behringer USB mixer that is then connected to a MacBook pro to record podcasts via Audacity. In playback only in Audacity, we hear random "pops" that sound like electric shocks.

We can't hear these noises while recording. Since noticing them, we've tried a different, non-usb mixer with an iMic. We've even tried a brand new MacBook pro. And we even had an electrician to come in and test all of our outlets, and everything turned out fine.

Could it be static from the carpet in the studio?

We are at a loss. Any help would be huge. Thanks!

Tony


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Chris Wright
Re: Random pops during playback
on Sep 21, 2017 at 3:30:13 am

bad cable


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Tony Trabucco
Re: Random pops during playback
on Sep 21, 2017 at 3:39:14 pm

What cable is bad? The microphone cable? Or cable from mixer board?


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Bob Mark
Re: Random pops during playback
on Sep 21, 2017 at 2:17:05 pm

Do you see the impulse clicks on the waveform? What if you record without the input connected?

Bob


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Tony Trabucco
Re: Random pops during playback
on Sep 21, 2017 at 3:40:49 pm

No, these noises don't show up in waveform. And they are not heard while recording. Only heard in playback.


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Bob Mark
Re: Random pops during playback
on Sep 21, 2017 at 5:27:43 pm

If they aren't in the waveform, it sounds like a playback device issue. Can you check if the audio file has DC offset?

Bob


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Bruce Watson
Re: Random pops during playback
on Sep 21, 2017 at 7:08:00 pm

[Bob Mark] "If they aren't in the waveform, it sounds like a playback device issue."

Yup. If it's not in the waveform, it's not in the file. So what you recorded is likely fine. Your problem seems to be downstream of your recorder (Macbook), in your playback system somewhere.


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Bob Mark
Re: Random pops during playback
on Sep 21, 2017 at 7:57:18 pm

Can you post a file so we can check it?

Bob


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Tony Trabucco
Re: Random pops during playback
on Sep 22, 2017 at 2:33:04 pm

If it does show up in waveform, it's tough to tell. But I do know we definitely don't hear it while recording.

I tried to "normalize" it and there's an option then to "remove DC offset." I've tried it both ways and it does not affect it either way.

It doesn't happen all the time. We tried shutting wireless internet and bluetooth off while recording yesterday, and the noise didn't happen. We're hoping it's either that or static of some sort.


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Ty Ford
Re: Random pops during playback
on Sep 22, 2017 at 3:50:06 pm

Hello Tony and a belated welcome to the Cow Audio Forum.

You've received a lot of good suggestions so far.

Play the file back on another device. Do you hear clicks there?

It could possibly be a driver issue between Audacity, the Behringer and MacBook Pro.

Post the file somewhere we can hear it.

Regards,

Ty Ford
Cow Audio Forum Leader

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Tony Trabucco
Re: Random pops during playback
on Sep 26, 2017 at 6:40:10 pm

11712_test.wav.zip

Here's an audio file. It's the second noise/pop that's the issue. And this actually occurred while recording on Adobe Audition. It was a little softer than Audacity, but it's still happening. And again, we don't hear this during the recording. It's just on there after.


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Ty Ford
Re: Random pops during playback
on Sep 26, 2017 at 7:59:50 pm

Tony,

OK. I hear no pops or clicks.

I suggest you not choose 32-bit floating. You don't need files that big for your work.
24-bit or even 16-bit should be fine.

It could be that your playback system is choking on 32-bit.

Regards,

Ty Ford
Cow Audio Forum Leader

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Bob Mark
Re: Random pops during playback
on Sep 26, 2017 at 9:15:51 pm

No pops for me either. I agree with Ty, you don't need 32 bit at all. Try it again at 16 bit and see if you still have pops.
Your file did have some DC offset, but not enough to cause pops for me.

Bob


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Tony Trabucco
Re: Random pops during playback
on Sep 27, 2017 at 1:52:41 am

Maybe I described the noise with the wrong word, but there's that type of electric shock sound. Could that just be because I record in 32-bit float?


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Ty Ford
Re: Random pops during playback
on Sep 27, 2017 at 2:09:39 am

Tony,

Again, no noises in your file.

Yes, recording and/or playing back 32-bit files on a system that can not handle it because of its data limitations can result in bad things. Bigger is not always better.

As I suggested before, try recording at 16 or 24 bit and see what happens.

Ty Ford
Cow Audio Forum Leader

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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Tony Trabucco
Re: Random pops during playback
on Oct 2, 2017 at 7:54:54 pm

Here it is again, right before I say "Uh" at the end. Recording on 16-bit. Very small dot was on the waveform. This time, recorded on Adobe Audition. Need to get rid of these small pops. Any help or advice would be great.

11735_recordingnoise.wav.zip


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Ty Ford
Re: Random pops during playback
on Oct 2, 2017 at 10:46:15 pm

it's a 1 second clip. I can't even tell what's going on.

As I said before. I think it's in your playback system. The file you posted before that I listened to had no problems.

Regards,

Ty Ford
Cow Audio Forum Leader

Want better production audio?: Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog: Ty Ford's Blog


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