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 How is the FFT amplitude be normalized£¿		  New Topic  Reply to Topic
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stevenbrown

4 Posts
Posted - 03/20/2013 :  08:56:52 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
It' known that the power spectral density of a set of discrete signal can be calculated using Origin by click the 'Analysis'¡ú'FFT', and one of the Output options is 'Normalize Amplitude'.
My question is£ºhow is the amplitude be normalized£¿Is it normalized by the sum of the squares of the window function£¿
Thanks.

Kathy_Wang

China
159 Posts
Posted - 03/20/2013 :  11:44:46 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

Please refer to the algorithm of FFT in our online help file, which illustrates how the normalized amplitude in dB is calculated.



Kathy
Originlab
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stevenbrown

4 Posts
Posted - 03/22/2013 :  05:30:51 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I'm sorry I can not access the online help. Could you please attach the text£¿ I'm in hurry and I want to know it immediately.

Thank you very much£¡
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matthew@originlab.com

73 Posts
Posted - 03/22/2013 :  09:15:23 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

It appears that link is broken, please see if this one works for you:

http://www.originlab.com/www/helponline/Origin/en/UserGuide/Algorithm_(FFT1).html

Note: for some reason the forum isn't seeing the whole URL as the link, so please just copy and paste the entire URL to view the help page.

Matthew
OriginLab
Edited by - matthew@originlab.com on 03/22/2013 3:37:57 PM
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stevenbrown

4 Posts
Posted - 03/27/2013 :  9:16:08 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
¡°Sorry. The page you have requested does not exist.
You are being forwarded to our home page.¡±

I can not access it.
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matthew@originlab.com

73 Posts
Posted - 03/29/2013 :  09:42:21 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Clicking on the link won't work, you will need to copy the entirety of the link, from http... to ...html and paste it into your browser.

The forum doesn't recognize the parentheses as being part of the link when they are. That's why it's not working.

Matthew
OriginLab
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stevenbrown

4 Posts
Posted - 03/30/2013 :  9:47:10 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks, I will try it.
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