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From: yraurb@hou2g.UUCP (G.DECKER)
Newsgroups: net.audio
Subject: Processing digital audio
Message-ID: <222@hou2g.UUCP>
Date: Thu, 5-Apr-84 16:39:25 EST
Article-I.D.: hou2g.222
Posted: Thu Apr  5 16:39:25 1984
Date-Received: Sat, 7-Apr-84 03:13:54 EST
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 11

I was browsing through the latest Phillips Technical Review and came across
an article on digital audio circuits and listening tests.  They have develop-
ed a computer system that can simulate different digital circuit configur-
ations for signal processing and they can do this in real time.  They im-
plemented Fletcher-Munson curves and reverberation.  It occurred to me that
a mortee correct implementation of Fletcher -Munson curves would track the 
instantaneous level of the program since the "correction" should take into
account the absolute l;evels as well as the volume difference between live
and reproduced.  Anyway, they concluded that word lengths of over 22 bits
are necessary to maintain 16 bit quality from input to output when doing 
this kind of processingsignal processing for delay lines of reverberation.r reverberation.