What is the best point in digitizing process to reduce noise?

I'm scanning music and conversations from old tapes in a variety of formats.  LPs from reel tapes that are 40 years of age are surprisingly beautiful after all these years with a package to remove the plate rotating rumble, noise hiss and system type at the same time.  Old good acoustics records jam 4 tracks of reel and cassette (90), as well.

Recently, however, in a package of 4 tracks, the person at the registration rolls ('engineer' does not apply) was the spirit that the warmer the better signal.  We have found that we can save to the low output of the TEAC level to avoid clipping etc. (it is what it is), but once all the "capture" is made, we wonder when it is best to remove the noise.  The transfer chain extends from the A3400 TEAC (machine used to record) in the first two channels of two Presonus FP10s (for unbalanced inputs) and in the 'recorder' PC via Firewire.  We post-process, for most inversions (Yes), but amplification (+ 12 db and more) the slopes to bring the signal up, which will also amplify the noise that is present.

THE QUESTION: Is it better to amplify and then remove it or do it before amplification?

I don't know that there will be other issues past this obstacle.  Some of these bands are garbage, but, by lack of documentation or even sloppy notes, we can not find until it we play and we found that there is less time to just capture everything, like listening the content is easier (and much less prone to damage than strips) on the digital side.  Given that some of them were zero tracks and guide for incomplete songs of the band members who have left us, 'value' cannot be achieved until it is heard.   Only 30 or more rolls and maybe a third of them deserve to be save.  We know that we're going to come with everything that will be more than a snapshot in memory of someone, but the details in to the songs and the missed votes will be worth it.

Thank you

harryevan33 wrote:

THE QUESTION: Is it better to amplify and then remove it or do it before amplification?

It's a good idea to standardize everything first, then remove the noise. Standardization is really amplification but automatically sets the gain so that the highlight is purchased a set level. This is usually set to something like - 1dBFS. If you do it the other way around you never know how much noise you hear when you make subsequent amplification. As usual, try and make your reduction of noise in several passes to the smaller reduction rather than trying to do everything at once. This reduces the likelihood of unwanted artifacts.

Tags: Audition

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