dc-offset adaptive

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dc-offset adaptive

Permanent link to this post Posted by cazorla » Wed Feb 22, 2017 1:24 am

maybe similar to ffmpeg's dynamic normalization or linear-phase filter-out <3hz
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Re: dc-offset adaptive

Permanent link to this post Posted by steve » Wed Feb 22, 2017 1:40 am

Why?
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Re: dc-offset adaptive

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

Effect > Normalize: [X] Remove DC Offset... and nothing else.

Logically sheering off the bottom of the frequency response should work a treat, but it doesn't. It leaves a pop or spike at the beginning and the end. Audacity Normalize uses a statistical averaging technique without affecting the (audible) response, and it does it cleanly over the whole performance.

We beat this up extensively a while back and over time, we discovered why the developers did it his way. Yes, it is possible to present a very badly damaged performance and fake out the process, but it's unlikely a performance that badly damaged is to be rescued anyway and over the majority of productions and shows, it works very well.

Feel free to High Pass Filter anyway if you think you need it

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Re: dc-offset adaptive

Permanent link to this post Posted by cazorla » Tue Feb 28, 2017 1:16 am

what about a non-fft/filter/freq approach
measuring the dc-offset for multiple audio-chucks
and doing dc-offset for them and averaging/smoothing between the frames similar to
http://muldersoft.com/docs/dyauno_readme.html#dynamic-normalization-algorithm
but doing only dc offset?
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Re: dc-offset adaptive

Permanent link to this post Posted by steve » Tue Feb 28, 2017 3:49 pm

Is there a purpose to this? If so, what is it?
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Re: dc-offset adaptive

Permanent link to this post Posted by cazorla » Thu Mar 02, 2017 12:55 am

uses: podcasts that include external audio-clips
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Re: dc-offset adaptive

Permanent link to this post Posted by cazorla » Thu Mar 02, 2017 12:56 am

or non-optimal environments that include turning on/off audio-sources
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Re: dc-offset adaptive

Permanent link to this post Posted by steve » Thu Mar 02, 2017 9:14 am

When importing audio clips that have DC offset, the DC offset should be for that clip. That is, corrected before joining or mixing in with other audio. If you don't do that then you will have the more difficult problem to deal with, of fixing clicks at the start/end of the clip.
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Re: dc-offset adaptive

Permanent link to this post Posted by steve » Thu Mar 02, 2017 9:15 am

cazorla wrote:or non-optimal environments that include turning on/off audio-sources

Adaptive bias correction does not fix clicks.
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