Path: utzoo!attcan!uunet!cbmvax!rutgers!gatech!ncar!ames!elroy!aero!trwrb!cadovax!keithd
From: keithd@cadovax.UUCP (Keith Doyle)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 2 More Questions
Message-ID: <2235@cadovax.UUCP>
Date: 6 Sep 88 21:12:55 GMT
References: <3401@crash.cts.com>
Reply-To: keithd@cadovax.UUCP (Keith Doyle)
Organization: Contel Business Systems, Torrance, CA
Lines: 25

In article <3401@crash.cts.com> haitex@pnet01.cts.com (Wade Bickel) writes:
>james@spies.UUCP (JAMES) writes:
>>>    QUESTION#2)  Is it possible with software and hardware capabilities
>>>                 to digitize a song and have the computer convert the
>>>                 wavelengths into notes/sheetmusic and then print it
>
>        Check out a product called Visual Aurals by Geodesic Publishing.  I
>don't have the ph # handy, but if you cannot find it send me EMail and I will
>find it and send it to you.  Part of the Visual Aurals product is a piece of
>hardware called the MindLight (about $100) which is capable of doing the
>necessary FFT's in real time.  They describe it as being an Electronic "Ear".

I kinda doubt they're actually doing FFT's in real time.  They probably
have a bank of filters.  Which may mean that with a little imagination you 
may be able to do some vocoder effects, but it would probably not have the 
accuracy to convert notes into sheetmusic.

In fact, even FFT won't help you unless you guarantee the music you're
processing isn't composed of chords.  To an FFT, most chords are pretty
indistinguishable from harmonic-laden timbres.  An FFT can only seperate
the horn part from the string part if some smart kind of post-processing 
knows a HECK of a lot about the frequency characteristics of horns and strings.

Keith Doyle
#  {ucbvax,decvax}!trwrb!cadovax!keithd  Contel Business Systems 213-323-8170