NetNews Usenet Archive 1993 #3/NN_1993_3.iso/spool/rec/audio/19078

Text File | 1993-01-21 | 1.6 KB | 34 lines

Newsgroups: rec.audio
Path: sparky!uunet!cs.utexas.edu!torn!nott!dgbt!ted
From: [e-mail] (Ted Grusec)
Subject: Re: DAT, DCC and MD
Message-ID: <[e-mail]>
Organization: The Communications Research Centre
References: <[e-mail]> <[e-mail]>
Date: Fri, 22 Jan 93 01:03:06 GMT
Lines: 23

In article <[e-mail]> [e-mail] writes:
>

>PASC is based on two phenomena of the human ear:
>* One can only hear sound above a certain level, called the absolute hearing threshold.
>* Loud sounds hide, or mask, softer sounds in their vicinity. They dynamially adapt the
>  hearing threshold. This applies to the frequency domain (spectral masking) as well as to
>  the tiem domain (temporal masking).
>So you have to be a GOD to hear the differences between CD and DCC.

Well Jack, I have run experiments on at least 25 or 30 people who must
be Gods.  Under tightly controlled, double blind conditions, they can
tell the difference on certain audio materials with complete
reliability.   No lossy compression scheme is "perfect" - there will
always be listeners who find non-transparency under critical
materials.  This does not mean that this kind of compression is not of
very high quality, nor that it won't suffice for "average" listeners
under non-critical conditions.  I can send you published reports from
my lab if you wish.>
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Ted Grusec - Communications Research Centre, Ottawa, Ont., Canada
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