I'm having a hard time finding anyone who could hear past the -72dB
noise, here around.
Really, either you have super-ears, or the cause is (technically)
somewhere else. But it matters, because the whole point of dithering to
16bit depends on how common that ability is.
-----Message d'origine----- From: Andrew Simper
Sent: Saturday, February 07, 2015 2:08 PM
To: A discussion list for music-related DSP
Subject: Re: [music-dsp] Dither video and articles
On 7 February 2015 at 03:52, Didier Dambrin <di...@skynet.be> wrote:
It was just several times the same fading in/out noise at different
levels,
just to see if you hear quieter things than I do, I thought you'd have
guessed that.
https://drive.google.com/file/d/0B6Cr7wjQ2EPub2I1aGExVmJCNzA/view?usp=sharing
(0dB, -36dB, -54dB, -66dB, -72dB, -78dB)
Here if I make the starting noise annoying, then I hear the first 4
parts,
until 18:00. Thus, if 0dB is my threshold of annoyance, I can't hear
-72dB.
So you hear it at -78dB? Would be interesting to know how many can,
and if
it's subjective or a matter of testing environment (the variable already
being the 0dB "annoyance" starting point)
Yep, I could hear all of them, and the time I couldn't hear the hiss
any more as at the 28.7 second mark, just before the end of the file.
For reference this noise blast sounded much louder than the bass tone
that Nigel posted when both were normalised, I had my headphones amp
at -18 dB so the first noise peak was loud but not uncomfortable.
I thought it was an odd test since the test file just stopped before I
couldn't hear the LFO amplitude modulation cycles, so I wasn't sure
what you were trying to prove!
All the best,
Andy
-----Message d'origine----- From: Andrew Simper
Sent: Friday, February 06, 2015 3:21 PM
To: A discussion list for music-related DSP
Subject: Re: [music-dsp] Dither video and articles
Sorry, you said until, which is even more confusing. There are
multiple points when I hear the noise until since it sounds like the
noise is modulated in amplitude by a sine like LFO for the entire
file, so the volume of the noise ramps up and down in a cyclic manner.
The last ramping I hear fades out at around the 28.7 second mark when
it is hard to tell if it just ramps out at that point or is just on
the verge of ramping up again and then the file ends at 28.93 seconds.
I have not tried to measure the LFO wavelength or any other such
things, this is just going on listening alone.
All the best,
Andrew Simper
On 6 February 2015 at 22:01, Andrew Simper <a...@cytomic.com> wrote:
On 6 February 2015 at 17:32, Didier Dambrin <di...@skynet.be> wrote:
Just out of curiosity, until which point do you hear the noise in this
little test (a 32bit float wav), starting from a bearable first part?
https://drive.google.com/file/d/0B6Cr7wjQ2EPucjFCSUhGNkVRaUE/view?usp=sharing
I hear noise immediately in that recording, it's hard to tell exactly
the time I can first hear it since there is some latency from when I
press play to when the sound starts, but as far as I can tell it is
straight away. Why do you ask such silly questions?
All the best,
Andrew Simper
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