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Re: Software for chord identification

Hi Eric,

my suggestion would be to automatically extract the key and the concert
pitch frequeny of the recorded signal and compare the results with the
known resp. assumed values. While not error-free, these technologies are
getting relatively robust these days.


Eric Jacobs wrote:
> I apologize if my post was not more clearly worded.  I'll try to do
> better:
> If I know what chord is being played (call this "actual chord") - and I
> do know what chord should be played (call this "ideal chord") - I can
> adjust the recording speed as required to reproduce the ideal chord.
> So to your reply of "it must be possible to find a turntable speed...",
> the question is "what tools are available to help one find that speed",
> particularly if one is relatively tone deaf.
> What temporal aspects make the most sense to look at to identify the
> correct speed?  And what tools are out there to measure those
> temporal aspects and relate them to correct values?
> Thanks!
> Eric
> -----Original Message-----
> From: Leon van Noorden [mailto:leonvannoorden@xxxxxxxxx]
> Sent: Wednesday, September 07, 2005 2:50 PM
> To: AUDITORY@xxxxxxxxxxxxxxx
> Cc: ericj@xxxxxxxxxxxxxxxxxxx
> Subject: RE: Software for chord identification
> I don't understand this question. The tones in a chord changes also with the
> change in turntable speed. I think it is much better to study the temporal
> aspects of the music. Not all temporal aspects (such as musical phrases
> versus trills etc) change in the same way if one plays a piece faster or
> slower (I mean in reality, before recording it). From this it must be
> possible to find a turntable speed where all the temporal aspects seem to
> sound natural. This must then be the original speed.
> Leon van Noorden
> -----Message d'origine-----
> De : AUDITORY Research in Auditory Perception
> [mailto:AUDITORY@xxxxxxxxxxxxxxx] De la part de Eric Jacobs
> Envoyé : woensdag 7 september 2005 20:31
> À : AUDITORY@xxxxxxxxxxxxxxx
> Objet : Software for chord identification
> Is there software for tone deaf people that can analyze a
> segment of digitized sound and report the chord(s)?  The
> specific application is in sound restoration, for recorded
> music that was recorded at an unknown speed, and needs
> to be "repitched".  This is often the case with older
> 78 RPM records, where the actual playback speed can range
> anywhere from 68 to 90 RPM.
> Eric Jacobs
> The Audio Archive
> Lexington, MA
> mailto:EricJ@xxxxxxxxxxxxxxxxxxx

dipl. ing.
alexander lerch

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