Re: Software for chord identification

[alexander lerch <lerch@xxxxxxxxx>]

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.

Cheers,
Alexander


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
> USA
> mailto:EricJ@xxxxxxxxxxxxxxxxxxx
> 

-- 
dipl. ing.
alexander lerch

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