Re: [LAU] [Sort of OT] Ringing in filters

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To: <linux-audio-user@...>
Date: Wednesday, May 12, 2010 - 4:55 am

Mark Knecht wrote:

> I think also that an FFT assumes some sort of longer-term steady state

Its actually worse than that. The FFT assumes that the input is steady
state periodic with a period length equal to the FFT length.

> repetitive nature which isn't in the stock data.

The good news is that your stock data isn't much worse of a fit to
the assumptions of the FFT than real audio data :-).

> I could take a

Then you loose time locality. In music, its not uncommon for the
chord to change once every bar. By doing the FFT over 100 bars
you are effectively 'averaging' the chord over those 100 bars.

Erik
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Erik de Castro Lopo
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Messages in current thread:
[LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Tue May 11, 9:43 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 11, 10:11 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Tue May 11, 10:36 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Tue May 11, 11:35 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 11, 11:19 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 1:16 am)
Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Wed May 12, 4:55 am)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 12:41 am)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 9:11 am)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 6:32 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 7:44 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 9:01 am)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 8:44 am)
Re: [LAU] [Sort of OT] Ringing in filters, Joel Roth, (Wed May 12, 8:16 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Thu May 13, 8:00 am)
Re: [LAU] [Sort of OT] Ringing in filters, Joel Roth, (Mon May 17, 9:14 am)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Mon May 17, 9:31 am)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Tue May 18, 8:55 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Folderol, (Tue May 18, 9:03 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Patrick Shirkey, (Mon May 17, 9:52 am)
Re: [LAU] [Sort of OT] Ringing in filters, Ken Restivo, (Wed May 12, 8:04 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Jörn Nettingsmeier, (Mon May 17, 9:55 am)
Re: [LAU] [Sort of OT] Ringing in filters, Garry Ogle, (Mon May 17, 8:13 am)
Re: [LAU] [Sort of OT] Ringing in filters, Erik de Castro Lopo, (Tue May 11, 11:46 pm)
Re: [LAU] [Sort of OT] Ringing in filters, Fons Adriaensen, (Wed May 12, 8:52 am)
Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 1:00 am)
Re: [LAU] [Sort of OT] Ringing in filters, Chris Cannam, (Wed May 12, 9:09 am)
Re: [LAU] [Sort of OT] Ringing in filters, Chris Cannam, (Thu May 13, 7:47 am)
Re: [LAU] [Sort of OT] Ringing in filters, Mark Knecht, (Wed May 12, 3:05 pm)