Help. Little tics around 6000-8000Hz. Not mouth noises

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steve
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by steve » Fri Mar 05, 2021 7:06 pm

carnagecox wrote:
Fri Mar 05, 2021 6:54 pm
I know too little about the type of processing which goes on during a recording
You know all there is to know about that ;) - there is no processing during recording.
The sound card converts analog to digital, and Audacity writes the digital data to disk, and that's about it.
carnagecox wrote:
Fri Mar 05, 2021 6:54 pm
Hmmmm well if you insist!
Please do.
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by carnagecox » Fri Mar 05, 2021 7:51 pm

Rightyho, so I did a recording whilst sitting like statue throughout. The clicks are there as before :( Also, they definitely occur more often as the recording proceeds.

I don't really understand what you mean by there not being any processing. Doesn't converting analogue to digital count as processing? Or even the writing of data to RAM or a drive? Just the conversion needs memory and CPU right? There is a length of data required to convert the signal to requisite resolution. Or am I misunderstanding the definition of processing?

Are there any settings on the laptop or audacity I can fiddle with to try to reduce the problem? Starting to panic a bit as the weekend is the only time I get to do recording!

My sister has a similar setup with linux mint and audacity. Different laptop is all, and she doesn't get the clicks!

Thanks

Em

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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by steve » Fri Mar 05, 2021 8:25 pm

carnagecox wrote:
Fri Mar 05, 2021 7:51 pm
I don't really understand what you mean by there not being any processing.
I mean the data isn't modified by a process.
I guess that the conversion from analog to digital could be called "processing", but once the data is received by Audacity it is a stream of numbers that are written to disk. Audacity doesn't care what the numbers are, it just writes what it receives.

carnagecox wrote:
Fri Mar 05, 2021 7:51 pm
The clicks are there as before :( Also, they definitely occur more often as the recording proceeds.
How soon during the recording do they start?

Do you use a "pop shield"? (One of these: https://www.soundonsound.com/sound-advi ... -need-them)
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carnagecox
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by carnagecox » Fri Mar 05, 2021 8:40 pm

Yes I use a pop shield. And the clicks occur in between speech, when I am sitting there doing nothing. First one is a few seconds in and is during speech. Now I know what I'm looking for, I can find them within speech too. Here are two waveform examples, one when the click is between speech, and one during. It's seriously annoying, if it was a work I could use Matlab to code a match filter and find it and remove it! That would be a fair bit of time developing though and time is what I don't have! Perhaps there is a plugin?

During quiet:
click.png
click.png (632 Bytes) Viewed 495 times
During speech:
Click in DC trend.png
Click in DC trend.png (3.77 KiB) Viewed 495 times
Thanks again for your help

Em

steve
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by steve » Fri Mar 05, 2021 11:06 pm

You've got me beat on the cause of the clicks.

They can be repaired effectively with the "Repair" effect and / or "Spectral Delete", though it would be very time consuming.

There's also this "de-clicker" effect that may speed up the process considerably: viewtopic.php?p=245549#p245549
The only instruction for that effect are in that topic. It is a "Nyquist plug-in" and installation instructions are here: https://manual.audacityteam.org/man/ins ... st_install
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by carnagecox » Sat Mar 06, 2021 9:24 am

Sigh, thanks for trying. There MUST be a cause though. I refuse to believe this isn't fixable!
Em

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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by Neil Darlow » Sat Mar 06, 2021 11:15 am

Hi,

I wonder if this is an USB artifact. I would be tempted to try interfacing your microphone to Audacity via JACK. Yes, I know it's another layer of audio management but at least it's going through a chain optimised for audio capture from USB devices.

ATB,
Neil

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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by carnagecox » Sat Mar 06, 2021 12:32 pm

Do I buy a usb to jack adapter?

steve
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by steve » Sat Mar 06, 2021 12:42 pm

You could try bypassing PulseAudio.

"Pulse" is the default sound system for most Desktop Linux distros. It provides a multi-client audio server layer between applications and the ALSA drivers.

You can tell Audacity to record directly from the ALSA device driver (bypassing Pulse) by selecting the "hw" option that corresponds with your USB mic as the "recording device" in the Device Toolbar.
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Re: Help. Little tics around 6000-8000Hz. Not mouth noises

Post by jademan » Sun Mar 07, 2021 1:28 pm

carnagecox wrote:
Fri Mar 05, 2021 7:51 pm
My sister has a similar setup with linux mint and audacity. Different laptop is all, and she doesn't get the clicks!
Hmm... And what happens when you try recording on each other's equipment?

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