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Interpolation of Clipping and Bit-Rate Questions., Adobe Audition Help for a Noob.
Engelsstaub
post Jun 14 2012, 03:06
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I've been testing out the trial of Adobe Audition and have noticed that it is a bit more detailed in analyzing and manipulating peaks and "clips" than Audacity. My immediate example is a needle-drop of Krisiun's "The Great Execution." (One track--1st illustration below.) The CD and iTunes Matched AAC files are a complete mess in that most of the entire recording is clipped or squashed or whatever. (Same track--second illustration below.) (Krisiun is a Brazilian "death metal" band, so there's quite a bit of sound anyway!)

LP Rip @ 16/44.1


iTunes Matched AAC file



If you look at the needledrop in the first illustration you'll notice five places (bottom/right channel) where the sound clipped for a small fraction of a second. I was thinking of zooming in and doing a simple "auto heal" on those as I'm very pleased with the sound of this album when burned to Redbook CD-R. You'll also notice that, if you look at the bottom-right of both illustrations, that Audition is working at 16-bit for the vinyl rip (recorded at 16/44) and 32-bit float for the iTunes AAC file.

Some questions: will working on those few clipped samples and exporting the results at the same bit-rate reduce the quality of the original recording? Why does Audition indicate that it is working at 32-bit float for a 16/44 AAC file while it remains at 16-bit for the FLAC?




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stephan_g
post Jun 15 2012, 10:51
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I doubt it is any more "premium" than your average entry-level (CMedia or PCM29xx based) USB interface. Looks like the Debut III USB has also been around for 5 years already, so you wouldn't expect bleeding edge technology either.

What kind of cartridge are you using? The stock OMB5e isn't much to write home about, AFAIK...

Another thing to watch out for: Correct speed. I was decidedly displeased when I found that my little Technics (an entry-level model, SL-BD20) played about 0.5% fast and, unlike the next model up the food chain, has no speed adjustments. This is distinctly audible when compared to a CD version of the same disc. I haven't digitized another record since (I wasn't 100% pleased with the cartridge or the rumble level either). The next one will be a direct drive with a strobe, or quartz direct drive. Let's see what the used market will supply. This analog stuff has a much less steep diminishing returns curve.

Maybe one really doesn't need more than 16 bits (a phonopre/cartridge already contribute a good bit of noise, but I think I looked at spectra once and didn't considering dithering sufficient)... but given that the OP wants "pro" quality and modern technology easily pulls it off, using 24/48 - 24/96 seems like a no-brainer. Then nobody will be able to complain about the A/D side at least. (I'd entrust such a job to a basic Audigy SE, though in 24/96 and accounting for a 1-sample offset between channels. Unlike analog technology, digital can be inexpensive and totally decent.)
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stephan_g
post Jun 18 2012, 21:08
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QUOTE (stephan_g @ Jun 15 2012, 11:51) *
Another thing to watch out for: Correct speed. I was decidedly displeased when I found that my little Technics (an entry-level model, SL-BD20) played about 0.5% fast and, unlike the next model up the food chain, has no speed adjustments.

Guess what - turns out I was wrong. I got a PM stating that it very much is possible, and lo and behold, the service manual now available on the interwebs (unlike the last time I tried) shows how to do it. I was looking at the wrong holes earlier, no wonder I only found bare PCB underneath.

I'm now at -0.1..-0.2% rather than +1.5% (!) before, and pitch has unsurprisingly normalised. Basically you can do it with a small Phillips (size 0) jeweller's screwdriver, a small object to place on the platter as an indicator that whizzes by at a clearly defined location, and a stopwatch. A fluorescent light and a strobe disc in theory are more comfortable, but here it meant that I had to drag the player into the cellar. Back upstairs, it was 1% slow. Hence the stopwatch method.
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Kees de Visser
post Jun 19 2012, 08:33
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QUOTE (stephan_g @ Jun 18 2012, 22:08) *
Hence the stopwatch method.
If you're willing to sacrifice one LP side, a straight radial scratch digitally recorded and analysed in the time domain could be a handy and pretty accurate method. I'm not sure if the scratch will change the speed enough to make the test invalid though.
Adjusting pitch of digital audio is easy but it might be best to get analogue source right. I wonder if pitch inaccuracy affecting the RIAA correction is something to worry about.
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Posts in this topic
- Engelsstaub   Interpolation of Clipping and Bit-Rate Questions.   Jun 14 2012, 03:06
- - saratoga   QUOTE (Engelsstaub @ Jun 13 2012, 22:06) ...   Jun 14 2012, 03:14
|- - Engelsstaub   QUOTE (saratoga @ Jun 13 2012, 21:14) ......   Jun 14 2012, 04:12
- - Ron Jones   To clarify, you're bringing 32-bit float files...   Jun 14 2012, 04:36
|- - Engelsstaub   QUOTE (Ron Jones @ Jun 13 2012, 22:36) To...   Jun 14 2012, 04:47
- - AndyH-ha   Working in 32 bit floating point, even if the orig...   Jun 14 2012, 05:53
|- - Engelsstaub   QUOTE (AndyH-ha @ Jun 13 2012, 23:53...   Jun 14 2012, 06:54
|- - Engelsstaub   These are the settings I used in converting the sa...   Jun 14 2012, 08:37
- - AndyH-ha   dither bit depth 0.5 bits p.d.f. shaped triangular...   Jun 14 2012, 11:49
|- - Engelsstaub   QUOTE (AndyH-ha @ Jun 14 2012, 05:49...   Jun 14 2012, 23:38
- - stephan_g   What does the recording side look like (hardware, ...   Jun 14 2012, 23:42
- - saratoga   Assuming he has a preamp that let's him set th...   Jun 14 2012, 23:49
- - Engelsstaub   In this instance the recording was done with a Pro...   Jun 14 2012, 23:52
- - stephan_g   I doubt it is any more "premium" than yo...   Jun 15 2012, 10:51
|- - saratoga   QUOTE (stephan_g @ Jun 15 2012, 05:51) Ma...   Jun 15 2012, 19:54
|- - stephan_g   QUOTE (stephan_g @ Jun 15 2012, 11:51) An...   Jun 18 2012, 21:08
|- - Kees de Visser   QUOTE (stephan_g @ Jun 18 2012, 22:08) He...   Jun 19 2012, 08:33
|- - Engelsstaub   QUOTE (Kees de Visser @ Jun 19 2012, 02:3...   Jun 19 2012, 12:18
|- - uart   QUOTE (Engelsstaub @ Jun 19 2012, 04:18) ...   Jun 19 2012, 13:01
- - Engelsstaub   An Audigy SE is out for me...I do my stuff on a Ma...   Jun 15 2012, 11:27
|- - stephan_g   QUOTE (Engelsstaub @ Jun 15 2012, 12:27) ...   Jun 15 2012, 17:06
|- - Engelsstaub   QUOTE (stephan_g @ Jun 15 2012, 11:06) .....   Jun 16 2012, 03:01
- - AndyH-ha   Are you sure about Audition doing something at 32 ...   Jun 16 2012, 08:07
|- - Engelsstaub   QUOTE (AndyH-ha @ Jun 16 2012, 02:07...   Jun 16 2012, 08:29
|- - Engelsstaub   QUOTE (AndyH-ha @ Jun 16 2012, 02:07...   Jun 18 2012, 10:42
- - AndyH-ha   The documentation is awkward. What is "best a...   Jun 18 2012, 13:38
- - AndyH-ha   The "32 bit" in their table seems to be ...   Jun 18 2012, 13:43
- - Engelsstaub   I guess it is too generic. I suppose I was just be...   Jun 18 2012, 14:00
- - Engelsstaub   I'm glad you got it figured out I'm not ...   Jun 19 2012, 05:04


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