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Ignis Fatuus
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Joined: 14/07/04
Posts: 22
Loc: York.
Why filtering can increase amplitude
      #909744 - 21/04/11 11:36 AM
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Hi! I understand the basics - that if a frequency wave is phased such that it's dips counteract a lower frequency wave's peaks, then a LPF will incrase the peaks of the overall sound. Does anyone know of any articles - or maybe books - on the details of this concept, and how it should affect your work in the studio?

Thanks in advance (if yes)!

IAN

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Korff
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Joined: 20/10/06
Posts: 1983
Loc: The Wrong Precinct
Re: Why filtering can increase amplitude new [Re: Ignis Fatuus]
      #909748 - 21/04/11 11:40 AM
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There's a good explanation (with diagram) of this phenomenon in Bob Katz's Mastering Audio. It's only a small section of the book, but it's a fantastic book nonetheless so I'll recommend it anyway!

As far as "how it should affect your work in the studio"... Two words: Leave headroom!

That's pretty much all you need to know; that filtering eliminates some frequency components, but that it can simultaneously raise peak levels.

So if you're high-pass filtering a track, don't have your levels too near 0dBFS beforehand. Similarly, if you're encoding something to MP3, leave headroom — the encoding process involves lots of filtering, and that can lead to the output file clipping.

Cheers!

Chris


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