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Topic: Mean Frequency

Author	Message
GMartin Joined: Feb 5, 2010 Posts: 308	Posted: Mar 4, 2014 10:57 PM    Post subject: Mean Frequency Jarek, I can not remember if this has been previously addressed or if I am missing something in the manual. I would like to calculate the mean frequency of particular bands. Is there an existing element for this and if not can one be implemented. Thanks George
jarek Joined: Oct 22, 2007 Posts: 1073	Posted: Mar 4, 2014 11:13 PM    Post subject: See in manual about VectorToScalar's : WEIGHTED_VALUE http://www.bioera.net/manual.html#_Toc381690456 This is hopefully what you want. That option has been added very recently.
GMartin Joined: Feb 5, 2010 Posts: 308	Posted: Mar 4, 2014 11:20 PM    Post subject: Jarek, Thanks. Learned two things Weighted value I have to update the manual I have on my computer Thanks
snovotill Joined: Feb 8, 2013 Posts: 80	Posted: Apr 2, 2014 7:32 AM    Post subject: George, Mean Frequency is normally calculated on power rather than on voltage. I therefore had to square the vectors before running them through WEIGHTED_VALUE. I'm curious if you ended up doing the same if you don't mind sharing your own observations regarding this. Stepan
GMartin Joined: Feb 5, 2010 Posts: 308	Posted: Apr 8, 2014 8:21 PM    Post subject: Jarek, I am trying to add the mean frequency to a design. I added vector to scalar. All functions are there except for weighted value. The are in the order that the manual lists them right down to middle index. But weighted value seems to have disappeared. Is this an issue in3.137 or am I missing something? Thanks George
jarek Joined: Oct 22, 2007 Posts: 1073	Posted: Apr 8, 2014 8:30 PM    Post subject: George, the WEIGHTED_VALUE is only available in the Float version of the element. It probably should be also added in the scalar version, I will see if that can be done.
GMartin Joined: Feb 5, 2010 Posts: 308	Posted: Apr 8, 2014 10:30 PM    Post subject: thanks Jarek the last time I did this it was in a float based design It slipped my mind this time. george
wjcroft Joined: Jul 30, 2008 Posts: 15	Posted: Jul 21, 2014 10:55 PM    Post subject: Spectral Centroid == Mean Frequency ? Jarek, hi. Thanks for these useful additions to VectorToScalar. Can you clarify if WEIGHTED_VALUE is the same as what is called Spectral Centroid? http://en.wikipedia.org/wiki/Spectral_centroid You might know that Bioexplorer implements a design object called \"Mean Frequency\", which has the description: \"Calculates the mean frequency, or center of mass of a specified frequency band using an FFT.\" So that certainly sounds like the same idea as Spectral Centroid (both descriptions use the \"center of mass\" phrase.) Which implies a weighted average. George, is that your understanding as well? Regards, William Croft
jarek Joined: Oct 22, 2007 Posts: 1073	Posted: Jul 22, 2014 12:35 AM    Post subject: Yes, I think it is the same.