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Old 27th February 2014, 08:12 AM   #51
gk7 is online now gk7
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Quote:
Originally Posted by Julf View Post
Sure - if that is what matters to you.
Julf, itīs not about "what matters to me", but about measuring an effect.
I think my question (which was addressed at Pavel who has obviously
extensive experience in measuring such things) was rather clearly stated.
There is no need for you to interpret what "matters to me".

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Originally Posted by Julf View Post
For proper measurements you need at least a spectrum analyzer, but software-based ones are getting pretty good -
Thats why I mentioned ARTA. Sometimes it helps to actually read the posts before responding...

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Originally Posted by Julf View Post
all you need is a low-noise, high-sample-rate sound card/audio interface.
Thats why I mentioned the ADI-2 I use (which is a bit better than the usual sound cards, BTW).
Sometimes it helps ...
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Old 27th February 2014, 08:24 AM   #52
PMA is offline PMA  Europe
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Georg,

please check this post
Over sampling of 44.1kHz Wav files.

I have placed it in the 44.1/16 oversampling thread, as it is directly related to the subject there.

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Old 27th February 2014, 08:28 AM   #53
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Many thanks, that is what I was looking for !
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Last edited by gk7; 27th February 2014 at 08:30 AM.
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Old 27th February 2014, 08:31 AM   #54
Julf is offline Julf  Europe
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Quote:
Originally Posted by gk7 View Post
Julf, itīs not about "what matters to me", but about measuring an effect.

[...]

There is no need for you to interpret what "matters to me".
We can measure a zillion different things. Some of them reflect subjectively perceived sound quality, but most of them don't, as long as they are within reasonable limits. Thus it is a question of what matters to you if you choose to care about a difference that might or might not be audible.

Our measurement instruments are great for measuring objective differences, and verifying our designs and models, but in the end it is the subjective sound quality perceived by the listener that is the ultimate "measurement".
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Old 27th February 2014, 12:56 PM   #55
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Default iZotope

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Originally Posted by esgigt View Post
Yesterday, searching for software to declip audio, I came upon iZotope RX3 and installed the demo. I fed the program with a beautiful song (clipped) and played around.. after dithering, resampling and declipping (in that order) I got a very good result. The harshness of the clipping had gone, more detail and better soundstage in general.

The problem was $349,- to be able to save this to disc...
There are softwares using iZotope technology at much lower price. Please check this link. Their Sample manager and Triumph use iZotope technology.

Audiofile
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Old 5th March 2014, 08:11 PM   #56
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Merging Technologies News Story - DXD Captures The Magic of Mahler
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Old 5th March 2014, 08:27 PM   #57
eganz1 is offline eganz1  United States
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Default Minimum phase filtering using SOX

Okay, I found out how to do the kind of processing I was looking for.

So starting with a 16-bit Redbook CD, I'm using foobar with the SOX plug-in to do the up sampling. I have been up sampling to 88 kHz and 176 kHz at 24 bits FLAC files. In particular, I wanted to compare normal up sampling to minimum phase filters.

The 176 kHz files are huge, and I presume they should be saved for special circumstances. They sound good, but to start with I mostly listened to 88 kHz files. In both cases up sampling in advance seems to be an improvement.

However, the minimum phase upsampling seems better, and seems more musical, and with fewer "digital" artifacts. Of course, we are not achieving SACD quality, but more of the magic seems to be there when using the minimum phase filters.

In particular I set SOX to bandwidth of 90% and minimum phase, with anti-aliasing, and best quality. Apparently, there is an updated plug-in that will allow you to go to 87.5% bandwidth which may be even better.

Eric
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Old 5th March 2014, 08:31 PM   #58
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So starting with a 16-bit Redbook CD, I'm using foobar with the SOX plug-in to do the up sampling. I have been up sampling to 88 kHz and 176 kHz at 24 bits FLAC files.
Did you try doing just upsampling but staying at 16 bits?
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Old 5th March 2014, 09:02 PM   #59
eganz1 is offline eganz1  United States
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No, I didn't try that, I don't see any reason to restrict ourselves to 16 bits. The methods I'm discussing here obviously require increasing bit depth.

There are plots of the impulse response of these filters here:
Transporter Round Two [SOX] (was Transporter for Ģ999...) - The Hitchhikers Guide To Meridian
In the second half of the page.
These techniques are being used by Meridian and Ayre in their players.

http://www.ayre.com/white_papers/Ayr...hite_Paper.pdf

Last edited by eganz1; 5th March 2014 at 09:06 PM.
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Old 5th March 2014, 10:26 PM   #60
Wombat is offline Wombat  Germany
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Quote:
Originally Posted by eganz1 View Post
No, I didn't try that, I don't see any reason to restrict ourselves to 16 bits. The methods I'm discussing here obviously require increasing bit depth.

There are plots of the impulse response of these filters here:
Transporter Round Two [SOX] (was Transporter for Ģ999...) - The Hitchhikers Guide To Meridian
In the second half of the page.
These techniques are being used by Meridian and Ayre in their players.

http://www.ayre.com/white_papers/Ayr...hite_Paper.pdf
With sox you can't mimic the impulse response of either Meridian nor Ayre. Only some minimum and immediate phase things. I may suggest creating spectral images of these recommended impulse resonses and wonder how much these change the whole frequency behaviour. Better to have the standard pre-echo at frequencies you can't hear.

Edit: i once did some for downsampling with sox but it should illustrate what i mean
Attached Images
File Type: png impulse_14.4.0.png (75.1 KB, 36 views)
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Last edited by Wombat; 5th March 2014 at 10:46 PM.
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