Rich Peet wrote,
> > 1. When there is no audio that is important above 15,000 cycles I
>> drop the gain in this region by 50% to 75% (6db to 10db) on a slope.
>> It does not effect the overall recording and hides the ragged
>> compression of this area that can be seen on a spectral display which
>> is the signature to many that the recording was a MD. It really does
>> not change the heard audio any, but for those that pay attention it
>> fools a few of them into thinking they may be looking at a 24 bit
>> recording with >100db s/n. I use it with restraint but hey if it
>> makes someone think that I am better and have higher tech equipment
>> then I do then it was worth the effort. This part of the edit is
>> vanity.
And Walt commented:
>Unless they use sonograms, few would find the MD effect you speak of.
>Nor is it consistently there. If it is in your equipment, then there may
>be some other fault with the equipment. It is certainly not consistently
>there in all the sonograms I've done on MD recordings.
I monitor my work with Spectrafoo instruments, and the effect that
Rich mentions is quite apparent in spectrum analyzer displays of
perceptual coded stuff. It doesn't show on sonagrams. It's a
sure-fire indicator that you're listening to a perceptually-coded
recording, even though you usually can't hear anything strange. I'm
going to play with the rolloffs as Rich suggests, but there isn't any
audible need for it--as he says, he does it just to clean up the
appearance on an analyzer.
Because I work in theater, I often have to do noise removal
processing, and I keep buying expensive software that does that. Even
the best is problematic, and I rarely do more than plain vanilla
equalization/filtering to my nature recordings. I would only use
dynamic noise filters on nature sounds if I was composing, mixing
cleaned-up specific sounds over a natural bed.
-Dan Dugan
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