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mandatory audio processing on imported audio?, ah la levels/curves/sharpening to images?
post Feb 28 2012, 18:59
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this link is down from my end http://wiki.hydrogenaudio.org/index.php?ti...cording_(Vinyl)


as a photographer i know that there are a few mandatory processes that must be applied to scanned film and digitised raw file images, such as levels adjustments and basic sharpening (well, assuming your intent is not to produce an abstract blurry image, etc) because of signal losses via scanning, etc.

does the same apply to digitised audio? Like film and raw files, i always import a wave/raw file to start with and in the past i have only ever applied a slight s-curve adjustment (light amplification) which in a photographic sense increases the contrast/saturation of the image, thereby reducing the amount of visual detail in shadows/highlights

my vinyl importation is simple and does not require 'headroom' (im not going to make large adjustments)

secondly, which ties in to headroom above, i've heard/read varying opinions on which bit rate to capture audio - photographically i could only compare this to editing an image which is 8 or 16 bits in depth - when making moderate/major adjustments, however, the clipping/loss of print information is substantial between the 2 files and can be seen when reviewing image levels (i don't know if it's better to visualise this in audio software or to just listen)

how does this tie into audio and which format is enough to capture/record and/or archive files given my requirements ?
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post Feb 28 2012, 21:32
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I agree. Nothing's really mandatory. After digitizing, the digital file should sound exacty like the vinyl (when played through the same system/speakers at the same volume).

This page has lots of helpful information, including software recommendations for "cleaning-up" the digitized copy.

my vinyl importation is simple and does not require 'headroom' (im not going to make large adjustments)

.... however, the clipping/loss of print information...
You need a bit of headroom so that you don't clip your analog-to-digital converter while recording. But the levels on vinyl are repeatable and somewhat constrained, so you don't need as much "safety margin" as with live recording.

After digitizing, you can normalize (AKA "maximize" volume so that the peaks hit the "digital maximum" of 0dB). There is no harm or quality loss in normalizing, although some people worry about "inter-sample overs" and prefer to normalize to around -1dB. I always normalize to 0dB, because I assume most digital-to-analog converters can handle the inter-sample overs, and I'm pretty sure I wouldn't hear the slight clipping anyway...
(I normalize the album as a whole, so the volume differences between tracks are not messed-up.)

Although it's not "mandatory", I always remove the "snap", "crackle", and "pop", with Wave Repair ($30 USD). It works great, in the manual mode and and it only "touches" the audio where you identify a defect. But, it's very time consuming.

I'll usually try some "regular" noise reduction to reduce the background noise, but sometimes this introduces artifacts.

If it's an older "dull sounding" recording, I'll boost the highs a bit. (Thats optional... Some people don't like the idea of altering the original sound.)

Then, I normalize as the final step.

This post has been edited by DVDdoug: Feb 28 2012, 21:40
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