Re: [LAU] Dithering...should we dither about it?

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To: <gnome@...>
Cc: linux-audio-user <linux-audio-user@...>
Date: Sunday, March 2, 2014 - 3:38 am

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On Sun, Mar 2, 2014 at 2:43 AM, david wrote:

I think the FLAC spec says it will handle anything from 4-32 bit-depth:
https://xiph.org/flac/faq.html#general__samples
That said, Audacity only has FLAC export options of 16 & 24 bit depths.
Ardour supports 8, 16 and 24. Still no 32 bit float support (at application
level).

I should correct my previous statement though: I *thought* I exported 32bit
float: but it turns out they're 24bits (from Ardour3), dithering set to
None. And cropping the resulting output in Audacity and exporting was to
16-bit PCM, so I was actually doing this all wrong (no dithering, 32 -> 24
-> 16).

A better workflow would be to:
A) Ardour export 32 bit float -> 16bit (with dither) -> Audacity 16bit in,
crop, 16bit out
B) Ardour export 32 bit -> 24 bit (no dither) -> Audacity 24bit in, crop,
export 16bit (with dither).

The important part being to not dither twice, since then you'll be adding
noise to the signal twice!

I'll be using option A above from now on I think, since it involves less
bit-depth changes.
Living and learning :) -Harry

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On Sun, Mar 2, 2014 at 2:43 AM, david <<=
a href=3D"mailto:gnome@hawaii.rr.com">gnome@hawaii.rr.com> wrote:> On 03/01/2014 08:51 AM, Harry van Haaren wrote:>> I general=
ly export to 32bit float .flac... so no dithering (or burning

/div>I think the FLAC spec says it will handle anything from 4-32 bit-depth=
: https://xiph.=
org/flac/faq.html#general__samples

That said, Audacity only has FLAC export options of 16 & 24 bit depths.=
Ardour supports 8, 16 and 24. Still no 32 bit float support (at applicatio=
n level).I should correct my previous statement though: I *th=
ought* I exported 32bit float: but it turns out they're 24bits (from Ar=
dour3), dithering set to None. And cropping the resulting output in Audacit=
y and exporting was to 16-bit PCM, so I was actually doing this all wrong (=
no dithering, 32 -> 24 -> 16).
A better workflow would be to:A) Ardour expor=
t 32 bit float -> 16bit (with dither) -> Audacity 16bit in, crop, 16b=
it outB) Ardour export 32 bit -> 24 bit (no dither) ->=
Audacity 24bit in, crop, export 16bit (with dither).
The important part being to not dither twice, since then you=
'll be adding noise to the signal twice!I=
'll be using option A above from now on I think, since it involves less=
bit-depth changes.
Living and learning :) -Harry

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Messages in current thread:
[LAU] Dithering...should we dither about it?, Brent Busby, (Sat Mar 1, 6:43 pm)
Re: [LAU] Dithering...should we dither about it?, Harry van Haaren, (Sat Mar 1, 6:51 pm)
Re: [LAU] Dithering...should we dither about it?, Harry van Haaren, (Sun Mar 2, 3:38 am)
Re: [LAU] Dithering...should we dither about it?, Philipp , (Sun Mar 2, 12:34 pm)
Re: [LAU] Dithering...should we dither about it?, Thorsten Wilms, (Sun Mar 2, 9:54 am)
Re: [LAU] Dithering...should we dither about it?, Jörn Nettingsmeier, (Sun Mar 2, 8:56 am)
Re: [LAU] Dithering...should we dither about it?, Fons Adriaensen, (Sun Mar 2, 1:59 pm)
Re: [LAU] Dithering...should we dither about it?, Harry van Haaren, (Mon Mar 3, 10:04 am)
Re: [LAU] Dithering...should we dither about it?, Paul Davis, (Sun Mar 2, 4:19 am)
Re: [LAU] Dithering...should we dither about it?, Ralf Mardorf, (Sun Mar 2, 3:47 am)