Is this a known undesirable feature?

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Is this a known undesirable feature?

Permanent link to this post Posted by kozikowski » Fri Nov 17, 2017 10:56 pm

I want to amplify portions of a 9 hour recording. It opens and plays in Audacity perfectly well and the tools such as Noise Reduction seem to work.

Screen Shot 2017-11-17 at 14.39.36.png
Screen Shot 2017-11-17 at 14.39.36.png (81.91 KiB) Viewed 172 times


I can drag-select almost any portion of the work and Effect > Amplify to get (what seems to be) a valid correction. The portion gets louder.

Screen Shot 2017-11-17 at 14.40.48.png
Screen Shot 2017-11-17 at 14.40.48.png (34.84 KiB) Viewed 172 times


What I can't do is select the work so that one end of the selection snaps to the end of the performance and forms a yellow line.
Effect > Amplify fails.

Screen Shot 2017-11-17 at 14.41.43.png
Screen Shot 2017-11-17 at 14.41.43.png (35.59 KiB) Viewed 172 times



Audacity 2.2.0
Mac OS-X 10.9.5

Koz
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Re: Is this a known undesirable feature?

Permanent link to this post Posted by kozikowski » Fri Nov 17, 2017 10:59 pm

Hold on this until I try something. I've been fooled by super long recordings before.
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Re: Is this a known undesirable feature?

Permanent link to this post Posted by kozikowski » Fri Nov 17, 2017 11:02 pm

That's a wave-off. There's a sound overload condition at the very end of the recording requiring no amplification.

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Re: Is this a known undesirable feature?

Permanent link to this post Posted by Trebor » Sat Nov 18, 2017 12:49 am

kozikowski wrote:That's a wave-off. There's a sound overload condition at the very end of the recording requiring no amplification.

Translation: there's a very loud sound (0dB) at the very end, which you can't see unless you zoom-in on the end.

It's probably the click noise when the recording device was switched off, (there's one at the very start).
The loud clicks can be deleted by zooming-in on them, selecting them, then pressing delete key.
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Re: Is this a known undesirable feature?

Permanent link to this post Posted by waxcylinder » Sat Nov 18, 2017 10:25 am

Trebor wrote:
kozikowski wrote:That's a wave-off. There's a sound overload condition at the very end of the recording requiring no amplification.

Translation: there's a very loud sound (0dB) at the very end, which you can't see unless you zoom-in on the end.

It's probably the click noise when the recording device was switched off, (there's one at the very start).
The loud clicks can be deleted by zooming-in on them, selecting them, then pressing delete key.


You also get an unwanted saturated loud click near the very when you use Timer Record (I use it to record streaming audio from the interweb). Oddly it does not happen every time - just most times AFAICT.

Maybe I should be logging this as a bug?

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Re: Is this a known undesirable feature?

Permanent link to this post Posted by kozikowski » Sat Nov 18, 2017 2:08 pm

Maybe I should be logging this as a bug?

Probably not for this particular problem.

You can also get this effect when you drop the recorder just before turning it off.

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