#434182 - 03/12/00 10:05 PM
HF content prior to AD conversion
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Audio Boffin
Senior Member
Registered: 02/26/00
Posts: 33
Loc: Sydney, NSW, Australia
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Does anyone here have an opinion on the do and do nots regarding boosting HF content prior to AD conversion into DAW's ? EG I recently borrowed one of Winton Morrow's Avalon front ends, and being a bit of a "type A person", when I saw that I could boost 32k, I did (recording medium was 2" 24 track analog). I was very happy with the play back (I used about 2 dB on male backing vocals using a CAD VX2). I am just entering the Pro Tools Mix|Plus scenario, using the Apogee converters, and I was wondering what happens to that boost I put in, bearing in mind that something has to happen to input content above half the sample rate.
Am I going to create aliasing hell with this technique in digi land ?
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#434183 - 03/12/00 10:16 PM
Re: HF content prior to AD conversion
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Pro Jules
MP Hall of Fame Member
Registered: 03/11/00
Posts: 2729
Loc: A yank living in London, UK si...
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I had the 40k selected and boosted 16db on my NTI mic pre, I couldn't really hear it.
However a bat crashed thorough the studio window, made a hell of a mess!
So, no.
Jules
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#434184 - 03/13/00 01:01 AM
Re: HF content prior to AD conversion
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gm
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Registered: 02/10/00
Posts: 2184
Loc: Williamson County, TN, USA
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I crank up 25K (so-called "air band") all the time.
Well, if the A/D's designed right, there's a brick wall filter that stops everything just before Nyquist.
No, I don't think we get into trouble with aliasing; I'm not hearing anything resembling artifacts due to blazing HF, and most filtering deployed in modern converters is sufficiently sharp to stop problems. Maybe overly sharp for most timbral profiles.
George
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