Path: utzoo!attcan!uunet!super!udel!princeton!njin!rutgers!ucsd!ucsdhub!jack!crash!pnet01!haitex
From: haitex@pnet01.cts.com (Wade Bickel)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 2 More Questions
Message-ID: <3410@crash.cts.com>
Date: 9 Sep 88 10:18:16 GMT
Sender: news@crash.cts.com
Organization: People-Net [pnet01], El Cajon CA
Lines: 34

keithd@cadovax.UUCP (Keith Doyle) writes:
>In article <3401@crash.cts.com> haitex@pnet01.cts.com (Wade Bickel) writes:
>>        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.

        I'm not exactly sure how it works, but the designer claimed that
given a polyphonic input it would be able to descriminate the bottom two
roots.  Since I don't have one, I can't experiment with it.  Even if I
did have one, I wouldn't have the time to play with it (which is why I have
resisted buying one thus far).

                                                Good Luck,


                                                            Wade.

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