Re: [Avid-L2] OT: Audio Question

Thanks Greg & David for pointing me in the right direction.
I guess late afternoon on a Friday is not the optimal time to begin
refreshing old info through one's brain.

Cheers,

B

Benjamin Hershleder
http://ContactBen.com
http://Hershleder.com

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On Apr 30, 2010, at 9:35 PM, David Dawkins wrote:

> Ben,
>
> You are looking for EQ not Pitch Shift. The idea is that hum, buzz or
> room noise can be eased out of the signal so as not to be nuisance.
>
> http://en.wikipedia.org/wiki/Roll-off
>
> Enough math there to keep Wilson happy.
>
> The steepness or slope of the roll off is part of the design and can
> be
> variable. You may also find your roll off filter is some one else's
> high
> pass filter.
>
> http://en.wikipedia.org/wiki/High-pass_filter
>
> Of course some one else's high pass filter might be an unsharp mask
> and
> have no relationship to audio whatsoever.
>
> DD
>
> Benjamin Hershleder wrote:
> >
> >
> >
> >
> > OK... who wants to help a dumb old guy?
> > Yes, that'd be me.
> >
> > So... I'm looking for an English translation of the definition
> below,
> > as well as a method to demonstrate it.
> >
> > "Roll-Off:
> > A decrease in audio gain in relation to octaves.
> > For every octave decrease in frequency there is a difference of
> -12dB
> > in audio gain."
> >
> > I thought I had deciphered this and did the following:
> >
> > 1- Created 2 pieces of tone. One was 300Hz and the other was 600Hz,
> > both at -20dB.
> > 2- I put a Pitch Shift plug-in on the 600Hz clip and lowered it 1
> > octave (verified the shift through comparison).
> > 3- Based on the definition above, my hypothesis was that the altered
> > clip would now play back at -32dB. It didn't. It played back at
> -20dB.
> >
> > Any takers?
> >
> > TIA,
> >
> > B
> >
> > Benjamin Hershleder
> > http://ContactBen.com <http://ContactBen.com>
> > http://Hershleder.com <http://Hershleder.com>
> >
> > Wear It In Post!
> > Fun T-shirts, mousepads & more
> > for Post Production Professionals
> > http://www.WearItInPost.com <http://www.WearItInPost.com>
> >
> > [Non-text portions of this message have been removed]
> >
> >
>
> --
> David Dawkins
> 780-905-9121
> dawk2@shaw.ca
>
> [Non-text portions of this message have been removed]
>
>
>

[Non-text portions of this message have been removed]

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