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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 14 2012, 23:42
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What does the recording side look like (hardware, resolution, sampling rate)? While 16/44 is adequate as an end format, recording should be done in 24/48 at least, or 24/88 - 24/96 when using lesser A/D converters. (The only exceptions exist in bottom of the barrel type hardware like an old Realtek ALC262 with its digital filter that includes a highpass and is identical for all the sample rates, so highpass cutoff shifts upward.)

I'd guess that Audition can record in 24 bit without having to jump through any hoops (Audacity is limited to 16 bit via DSound or MME, so as a Windows user you need to compile it with ASIO support). In Vista/7, it is also useful to use some sound API that gives complete control over the sound device, like WASAPI in exclusive mode or ASIO. Otherwise you have to mess with sample rate setting.

Anyway, Audition has a top-notch resampler, so that can be used for resampling to 16/44 after all the editing is done.

EDIT: My, those are some pretty advanced dithering options. (I'd be happy with some generic Gaussian p.d.f., ATH-based dither already.) Documentation is definitely needed there.

This post has been edited by stephan_g: Jun 14 2012, 23:45
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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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