yes, I know your a freshly graduated student, so you can call me on
not separating the terms, but yes, I'm aware that going from 24-96 to 16-44
no matter what method is employed entails dithering and resampling.
If you want to hear what your dithering noise sounds like, record
some silence sometimes then normalize it.
You'll hear all kinds of stuf, including any stray bus noise you might have,
if you have a nice clean system, you'll only hear white noise.
Be careful though and turn your speakers down before playing it though.
Dithering can be done by both hardware, and or software, as a matter
of faact, most converters do some dithering as part of their function,
and if you read that article you sent us from the benchmark guys,
when they were comparing conventional pcm systems with the 1 bit systems,
whether your getting your big bang from extremely high sampling
rates, but a small word size, or lower sampling rates and a bigger word,
considerable filtering and calculations have to be done to make it
come out right.
whether your downsampling, or dithering.
But I wanted to see if the more experienced users here had ever done
any tests dumping material across the digital bus of their cards,
or taking the extra step and really dumping in real time between two
quality interfaces.
When talking to my great friend and mentor Tom Kingston, he agreed,
that this would definitely be the sure fire way to
do a dump and get exactly what you hear re-recorded at the new sample
rate and bit depth.
It would entail one more a to d conversion, but that's not
necessarily a bad thing, if the digital bus is throwing away bits.
I'm sure it would be very minimal across a 36 bit bus,
such as the delta has, but we know for sure there are going to be
rounding errors when doing it with software, dealing with non-multiples.
At 02:35 PM 8/28/2010, you wrote:
i Chris.
At 12:24 PM 8/28/2010, you wrote:
I noticed it both in soundforge stock re-sampling, but ramped up to
highest quality, and also with sonar triangular and pow r 3.
You're talking about two different processes there. Resampling is
not the same thing as dithering.
Anyway, that's interesting you can hear a difference. Any audible
differences in dithering algorithms, for example, occur at least
90dB down, in the noise floor.
It's a very slight pitch variance but you can hear it.
Here's an experiment to try ... play one channel from the file that
you say has been changed slightly in pitch, through one channel, and
the same channel but from the 24/96 source through another channel.
Any pitch difference between the two should be quite audible as beating.
I'll have to install sf10 again and play with the isotope stuff,
since we don't really have anything but presets, I haven't messed
with that too much.
Yep we only have access to presets when it comes to the mastering
effects bundle, but we can access everything in the sample rate
conversion and dithering plug-ins. They are quite simple. Pick a
preset like resample to 44.1KHZ, and then maybe check the box that
says "use simlified quality setting". Then, you'll find a quality
slider that defaults to 50%, which you can bump up to 100% for
maximum quality. This also means maximum time crunching all the numbers.
iZotope 64-bit SRC is on the Process menu under Resample, and
Bit+Dither is on the Bit Depth sub-menu, again under Process. I bet
you can't hear a difference when resampling with iZotope 64bit SRC
with maximum quality and Bit+dither set to "advanced ultra dither".
So what's up with the accessibility on lthat stuff, any progress,
or did that die on the vine?
RX as a stand-alone application is getting there. As for Ozone run
under Sonar, not much progress has been made yet. They haven't given
up though, it's just going very slowly.
Chris
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