Allow normalizing and amplifying with amplitude

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Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Thu Aug 10, 2017 7:23 am

There are many occasions I wanted normalizing to amplitude. For example I want to normalize to 0.5. How are novices supposed to know that -6 means halving the volume? Also, converting to 8-bit PCM requires 0.00390625, but -48 dB is 0.003981071, not exactly the same, so some volumes may map wrong. I have to use calculator to get 20*log(1/256) which is -48.16479931. Very annoying.

Also, amplifying with amplitude. Peak could be amplitude. There can be a factor for amplifying, like 0.5 for half volume.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by steve » Thu Aug 10, 2017 10:27 am

Here is a "Quick Conversion Calculator" that you may find useful: https://forum.audacityteam.org/viewtopi ... 46#p100146
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Thu Aug 10, 2017 12:33 pm

Quick Conversion Calculator isn't built in Audacity, so novices won't know about it.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by steve » Thu Aug 10, 2017 12:54 pm

"You" know about it, so what's your problem?
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Thu Aug 10, 2017 1:15 pm

If new users join Audacity, they won't know how to use dB. I'm worried about these.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by steve » Thu Aug 10, 2017 2:20 pm

Personally I think it was a mistake for Audacity to use linear amplitude scales at all. Outside of Audacity, dB scale is used everywhere in audio, because in general, the dB scale is much better suited for audio than a linear scale. "dB" is not difficult once you get the idea that half or double is about 6 dB. In my opinion, the thing that is confusing, is having a mix of linear (+/- 1) scale in some places and dB scale in others. I think it would be far easier for new users if "dB" were used consistently throughout.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by kozikowski » Thu Aug 10, 2017 3:33 pm

Cool Edit split the difference. Their waveforms are in dB, but they use a distorted scale to reflect the most important parts of the show being in the top third. The straight dB range in Audacity reduces that range to a tiny, hard-to-see graphic element.

I noticed in graphic samples posted by someone in dB, their -65dB noise (which passes ACX conformance), is the same size as the show. That's not useful to a new user, either.

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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by kozikowski » Thu Aug 10, 2017 4:18 pm

And while we're here. The out-of-the-box Cool Edit had the sound meters the whole length of the bottom of the work window. I don't remember the range they defaulted to, but I wouldn't be shocked to learn it's the same expanded range I use.

Image

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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by kozikowski » Thu Aug 10, 2017 4:20 pm

I did keep a picture.

Image

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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Fri Aug 11, 2017 8:31 am

I think dB is bad. The worst places of dB that could be used is waveforms and spectrograms. Waveforms and spectrograms are much better with linear volume scale. dB is made for relative changes. Even if functions use relative changes (equalization, amplification) there should be option to use factor, like in change speed.
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