CSD algorithm

claudio · 7th May 2005, 12:15 AM

Hello,
I am looking for the algorithm used to calculate the Cumulative Spectral Decay, also known as Waterfall plot, from the impulse response.
I think it should have apperead on an AES paper: does anyone can help me? I would like to create a program that shows the CSD starting from a Speaker Workshop impulse response.

Thanks.
Claudio

Ron E · 7th May 2005, 12:48 AM

IIRC it is just a FFT that uses progressively less of the beginning of the signal

ucla88 · 7th May 2005, 03:56 AM

Ron is right

Look here for more

http://www.libinst.com/wattlar.htm

claudio · 8th May 2005, 03:50 PM

Thanks,
do you have any info about the windowing type? MLSSA and Clio suggest rectangular, Easylab uses Blackman/Harris.
Any specific AES paper to look for?

Regards.
Claudio

7th May 2005, 12:15 AM	#1
claudio diyAudio Member Join Date: Feb 2002 Location: Italy	CSD algorithm Hello, I am looking for the algorithm used to calculate the Cumulative Spectral Decay, also known as Waterfall plot, from the impulse response. I think it should have apperead on an AES paper: does anyone can help me? I would like to create a program that shows the CSD starting from a Speaker Workshop impulse response. Thanks. Claudio

7th May 2005, 12:48 AM	#2
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	IIRC it is just a FFT that uses progressively less of the beginning of the signal __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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7th May 2005, 03:56 AM	#3
ucla88 diyAudio Member Join Date: Dec 2001 Location: rocklin, CA	Ron is right Look here for more http://www.libinst.com/wattlar.htm

8th May 2005, 03:50 PM	#4
claudio diyAudio Member Join Date: Feb 2002 Location: Italy	Thanks, do you have any info about the windowing type? MLSSA and Clio suggest rectangular, Easylab uses Blackman/Harris. Any specific AES paper to look for? Regards. Claudio

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