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Re: Re: again about compression

Subject: Re: Re: again about compression
From: Dan Dugan <>
Date: Wed, 3 Apr 2002 01:52:25 -0800
Howard Coneybeare wrote:

>Has anyone ever tried using one mic which would connect to a preamp or
>similar device which in turn could provide signal to two different recording
>devices??(or are there reasons a novice like me doesn't know that it isn't
>possible?) If this were possible, it would seem to me that you should be
>able to compare a high end DAT recording to one compressed by ATRAC for
>example. In other words, the signal to each should be identical in every
>way. The only difference would be the recording process (and play back, and
>probably a few other things I don't know about!)
>It's just a question I've been pondering ... thought someone out there would
>likely have the answer.

What I've done to evaluate the effect of bit rate reduction is to 
take a fine example of nature sound (a bit of a Gordon Hempton CD), 
transfer it digitally to an MD, then transfer that back, again 
digitally, to PCM.

I can then do blind A/Bs between original and MD copy with my ABX 
setup. No one has been able to distinguish the recordings yet. And I 
can subtract the original and the encoded-decoded, resulting in a 
difference file that is what the encoding took out. An interesting 

-Dan Dugan


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