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mp3 from 32fp or 24 bit dithered?
Old 3 weeks ago
  #1
Gear Maniac
 
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mp3 from 32fp or 24 bit dithered?

Maybe my ears are tired. It seems, at least for the track I'm working on, that a 320k mp3 rendered from 32fp wav sounds more accurate than the 24 bit dithered wave file rendered from the same 32fp wav.

Am I crazy?

The 24 bit wave was rendered with flat TPDF dither which sounded most accurate to me.

I can't share the files at the moment but I wondered if anyone else had ever come to this unexpected conclusion.
Old 3 weeks ago
  #2
Lives for gear
 
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This was discussed in detail here: Lossy Files Made from 24 bit vs 16 bit WAVs?

https://www.youtube.com/watch?v=2iDrbgfPjPY
Old 3 weeks ago
  #3
Gear Maniac
 
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Quote:
Originally Posted by SmoothTone View Post
Thank you, I will investigate.
Old 3 weeks ago
  #4
Gear Maniac
 
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Quote:
Originally Posted by SmoothTone View Post
So according to Dan I'm not delusional, but the integrity of an mp3 rendered from 32fp could possibly be corrupted in the decoding process. I guess the safest bet is to render Mp3s from 16 bit dithered wavs.
Old 2 weeks ago
  #5
Gear Maniac
Dithering for mp3 doesn't work. After dithering it is not good to apply any processing, and mp3 does processing - makes your audio different sounding in a worse case, so dithering will be just as noise
Old 2 weeks ago
  #6
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MP3 encoding and decoding is practically a multi-band dither and "bit-crusher". Each band is "granted" its own noise floor (bit-depth), depending on its audibility relative to the other bands.

It will generally truncate and ignore any information below ~90dB. And this only in the best case. Typically more around 8bit to 2bit, it can even lift the noise floor for a band up to 0dB if declared inaudible.
Old 2 weeks ago
  #7
Gear Maniac
 
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Quote:
Originally Posted by FabienTDR View Post
MP3 encoding and decoding is practically a multi-band dither and "bit-crusher". Each band is "granted" its own noise floor (bit-depth), depending on its audibility relative to the other bands.

It will generally truncate and ignore any information below ~90dB. And this only in the best case. Typically more around 8bit to 2bit, it can even lift the noise floor for a band up to 0dB if declared inaudible.
Thank you for that information, I wasn't aware of what is actually going on behind the scenes.
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