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In Reply to: High-res Orchestral music Downloads available free posted by audioengr on January 25, 2007 at 12:06:59:
Converted to .wav and did a spectrum analysis.Everything below 24kHz is nicely imaged between 24-48kHz, so this is a 48kHz recording upped to 96kHz by mere sample replication!
The other recordings are true 96kHz, but have little or no musical information above 20kHz.
bring back dynamic range
Follow Ups:
It appears to my that it is exactly what it is supposed to be.Take the normal CD that is good to 22 kHz. It is digital signal is recorded at 44.1 kHz.
So by comparison for a 96 kHz signal you would see sound information only up to 48 kHz. This is what the charts below show.
Nothing surprising here. Just some miss understanding, right!
Nope.What we see here is the information from 0 to 24kHz mirror-imaged between 24kHz and 48kHz.
bring bac k dynamic range
Tell you what guys I'll remaster it again this weekend it will be a smaller file because I will not be Flac'ed and I'll also Flac the new file then you can check both file's and then you can post your findings and we can get to the bottom of this. In the meantime I'll check the original file on my mastering software later and see what's up.
Bob
HDTT
These are true 24/96 transfers through a Weiss Digital ADC2, other than that I don't know what to tell you.
Bob
HDTT
Your website also mentions that you use Weiss Saracon Sample Rate Conversion Software. Why are these used? Do you convert to 96/24 and then convert to 44.1/16 for CD?Did you manage to figure out why there is a mirror image on the Histoire du Soldat?
All of our releases are transfered from analog to 24bit word length 96khz sample rate then we use the Saracon to SRC to 16/44.1 for the redbook releases.
Mirror image?? are you talking about the 48khz discussion?
Bob
HDTT
Thanks for the info about SRC. Some people here feel that straight conversion to 44.1/16 is better than using SRC. But that would mean you need to have do mastering twice, once for CD and another for DVD.Yes, I am taking about the 48kHz discussion, the image of 0-24 kHz audio being seen from 24-48 kHz. I have linked to my screen shot because I cannot see Werner's screen shot.
Hi Bob,please see my reply to Christine, link below.
I have the 24/96 version. Maybe they put the wrong file on the website downloads.... I'll ask.
I was told that it is 24/96.
The spectral analysis doesn't lie. Something went wrong with that file.Or they wanted to give people a touch of NONOS sound ;-)
bring bac k dynamic range
..
bring bac k dynamic range
by downloading Goldwave and playing the file having both the spectrogram and waterfall visualizations in Goldwave turned on.Has anybody figured out why this happens? Bob any further ideas?
for those who are interested
Your graph shows content above 25kHz, around -72dB.Yes, there seems to be a notch around 20-30kHz, but there could be many reasons for this.
If your claim that this is an upsampled recording is true, there should be nothing above 24kHz (ie. artefacts should be below the digital noise floor of -144dB, not -72dB).
Perhaps you have attached the wrong graph?
"so this is a 48kHz recording upped to 96kHz by mere sample replication!"If you go from Fs 48kHz to 96kHz by pairwise replicating samples you fill in the band between 24kHz and 48kHz with the first image, somewhat attenuated by the sinc(f) function. And that closely matches what we are seeing here.
Except that in this file (I checked in an editor) the samples are not pairwise identical, but near-identical (making it all the more mysterious). So obviously something went wrong somewhere with this datastream.
You could argue that the fault lies with my Flac-> Wav conversion (foobar), but I used the same flow on all of the files, and the others came out just fine.
I am not suggesting that HDTT are cheating (why would they?), but rather that there might be something wrong with that particular file.
bring bac k dynamic range
Anything's possible? maybe the Flac had something to do with it? haven't experimented with Flac that much this is the first time, maybe somebody with more knowledge about the program can comment on this situation, even if it is possible??
I can assure you I don't upsample any of my releases there really isn't a need for it, and i never master at 24/48, so all this is very strange to me.
Thanks
Bob
HDTT
I opened the file in Adobe Audition, and applied the "Spectral Frequency Display" view, and you are right - the spectral pattern is curiously symmetrical.And the samples do appear to be valued in pairs.
You are right - it seems like a mastering fault.
just a matter of interest. what software did you use to do the spectrum analysis?
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