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From: bwm@ccice2.UUCP (Brad Miller)
Newsgroups: net.audio
Subject: Re: audio techniques/equipment questions...(carver)
Message-ID: <575@ccice2.UUCP>
Date: Wed, 30-Jan-85 13:13:43 EST
Article-I.D.: ccice2.575
Posted: Wed Jan 30 13:13:43 1985
Date-Received: Sun, 3-Feb-85 02:20:04 EST
References: <383@bonnie.UUCP> <1299@hou4b.UUCP>
Reply-To: bwm@ccice2.UUCP (Bradford W. Miller)
Organization: CCI Central Engineering, Rochester, NY
Lines: 43
Xref: seismo net.audio:4214
Summary: 


I own the carver holography setup (not the full preamp, just the holograph
generator) and I am VERY SATISFIED. I find the difference is phenominal
having it, and even better when I use my KOSS 4D time delay system to generate
slight ambiance. 

A lot of people seem to think that using such a system is 'cheating' compared
to sterio - you forget - sterio itself is just a gimmic. What the carver system
does is correct a serious flaw in the gimmic:

Given a point source of sound, some of the information from the sound will
reach both ears, somewhat stronger to the ear that is most aligned with
the sound. That is, given a normal seating and head position, a sound on
the hearers left side will be heard more in the left ear. There are just
two rays that are drawn from the point source to the ears, one for each
(we will ignore reflections for the moment that create ambiance, we are
discussing sound placement - psychoaccoustics.

When a recorded item is PROPERLY miked with just two mikes (multimiked
recordings don't survive the CARVER process sounding much different
than straight - perhaps a slight bass emphasis), and replyed in sterio,
each ear gets information from TWO speakers. That is the two rays drawn from
the point source to the two speakers is an analogue for a human listener
(try binaural recordings and play back thru headphones - this is the
best recording method), though the mikes are somewhat further apart than
the human ears. Unfortunately, some of the right channel info is picked
up by the left ear, because you are replaying from two speakers, that is,
we are now essentially dealing with two point sources, and have four rays
representing the sound info going to the ears (two to each ear, one from
each speaker). What the carver process does is generate information
in the opposite speaker to cancel out this crosstalk, so (if perfect)
the result is the same information reaching your ears as if you were
directly listening to the point source. Thus all the position information
originally present is restored.

This is basically out of the CARVER lit, and I am no expert in the subject,
but it seems to make sense to me. The sonic hologram really corrects
a shortcoming in sterio.

Brad Miller

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