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From: wtm@neoucom.UUCP (Bill Mayhew)
Newsgroups: net.micro.amiga
Subject: Re: analog->digital conversion, anyone?
Message-ID: <289@neoucom.UUCP>
Date: Wed, 1-Oct-86 16:30:22 EDT
Article-I.D.: neoucom.289
Posted: Wed Oct  1 16:30:22 1986
Date-Received: Sat, 4-Oct-86 02:15:59 EDT
References: <1352@jade.BERKELEY.EDU>
Organization: Northeastern Ohio Universities College of Medicine
Lines: 47
Summary: Applied visions audio digitizer is close to what you want.

[[line eater food]]

Hi,

	I've been using the audio digitizer made by Applied Visions
for a couple of months.  It plugs into the printer parallel port.
It is "only" 8 bits, but after all, that matches the audio out from
the Amiga correctly.

	The AV box supports recording on four tracks and can use as
much memory as you have in Chip memory.  I've taken samples that
are up to 275K long.  The input is only monaural, so you've got to
take several passes for multiple tracks.  It also allows you to
scale, merge, and reverse the sound (actually any voltage signal)
post hoc.  The maximum sampling rate is around 21KHz, which is
appropriate, given the rate of DMA sound output.  I think anything
higher would begin to interfere with the interrupts used by
Intuition.

	The unit comes in a little beige box a little bigger than a
cigarette package and attaches though a ribbon cable.  A cheap
microphone is included as well as an "RCA" pin style jack on the
front panel for generic line level audio input.

	The included software permits saving the sound in 8SVX IFF
single shot or three octave format, as well as in raw byte files.

	A spare db-25 jack is on the back of the box to facilitate
attaching a printer.  A lighted button on the front of the box
indicates whether it is on or passing through to the printer.

	All in all, it was a reasonable deal for around $129 or so.

	My only complaint is that although the manual is complete
enough to adequately operate the electronics and software, it stops
short of explaining the 8SVX IFF format, etc.  It would be nice, if
for once, the instructions for one of these things would go beyond
the dummy level.

	Some C language examples and Include files illustrating how
to load raw or 8SVX files are included on the diskette.

Bill Mayhew
Division of Basic Medical Sciences
Northeastern Ohio Universites College of Medicine
Rootstown, OH  44272  USA      phone 216-325-2511
(wtm@neoucom.UUCP)