Allow normalizing and amplifying with amplitude

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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by steve » Fri Aug 11, 2017 8:38 am

Piotr Grochowski wrote: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.

and yet "ACX" specify that for audiobooks to be accepted for sale by Amazon, the peak level must be no more than -3 dBFS. I'm very glad that I'm not having to constantly tell people that means "+/- 0.707946".
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Fri Aug 11, 2017 10:33 am

Why would they limit it to 70% volume File System (FS means File System)? It doesn't make sense.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by steve » Fri Aug 11, 2017 7:28 pm

"dBFS" means dB with reference to "Full Scale" (https://en.wikipedia.org/wiki/DBFS)
In the case of Audacity, full scale can be seen as the vertical height of the track, which we label as +/- 1.0. So +1 and -1 are equivalent to 0 dB.

Interestingly, for 32-bit float samples, 0 dB really is +1 or -1, but for 16-bit, 0 dB is actually +32767 or -32768, and for 24-bit 0 dB is +8,388,607 or - 8,388,608.
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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by kozikowski » Sat Aug 12, 2017 2:30 am

70% volume ... It doesn't make sense.

It also makes zero sense that they insist on posting master works as MP3, particularly because they're going to resample down to other products and services. If you're going to complain about quality/standards problems, that would be right at the top of my list. Most people can readily hear problems if they do that wrong.

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Re: Allow normalizing and amplifying with amplitude

Permanent link to this post Posted by Piotr Grochowski » Sat Aug 12, 2017 5:30 pm

kozikowski wrote:
70% volume ... It doesn't make sense.

It also makes zero sense that they insist on posting master works as MP3, particularly because they're going to resample down to other products and services. If you're going to complain about quality/standards problems, that would be right at the top of my list. Most people can readily hear problems if they do that wrong.

Koz

Don't rearrange words to make it completely different.

steve wrote:Interestingly, for 32-bit float samples, 0 dB really is +1 or -1, but for 16-bit, 0 dB is actually +32767 or -32768, and for 24-bit 0 dB is +8,388,607 or - 8,388,608.


It doesn't matter if it's 32-bit float, 64-bit float, 16-bit float, 6-bit float, or 4000-bit float. It's still -1 to 1. Pointless to say 32-bit float if it doesn't matter AND it's the only float in Audacity.

For PCM, I don't think so. I see 8-bit PCM as -1 to 127/128 in intervals of 1/128 (if only this existed in Audacity), 16-bit PCM as -1 to 32767/32768 in intervals of 1/32768, 3-bit PCM as -1 to 3/4 in intervals of 1/4 and so on. I think they're fixed-point, but not integer. Audacity even shows so, and if you zoom in the max is not exactly 1.
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