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  #1  
Old 03-17-2017, 05:07 PM
Laela Sayigh Laela Sayigh is offline
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Posts: 9
Default Center frequency measurements seem innacurate

We are getting the same center frequency measurements from quite different calls. I realize this is effected by the FFT size but that doesn't seem to account for the level of similarity that we are seeing.
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  #2  
Old 03-18-2017, 05:57 AM
Michael Pitzrick Michael Pitzrick is offline
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Posts: 233
Default Re: Center frequency measurements seem innacurate

Quote:
Originally Posted by Laela Sayigh View Post
We are getting the same center frequency measurements from quite different calls. I realize this is effected by the FFT size but that doesn't seem to account for the level of similarity that we are seeing.

Hi Laela,

Can you supply more details about the context of your question, perhaps by attaching a screen shot to your next post? If you do that, please "Enable Measurement Plots" as described on pages 167 - 168 of the Raven Pro User's Manual, which you can open from the Help menu in Raven Pro.

By the way, if you do not yet have Raven Pro 1.5 build 37, you may want to make a fresh installation of Raven Pro 1.5 from our website. There was a major update in January 2017 that broke the usual update path, so you'll have to re-install to continue to get updates. If you install Raven Pro 1.5 to a different path than your current installation, Raven should automatically detect your license from your previous Raven installation.

We recommend that you install Raven Pro 1.5 because it has several features -- and many improvements and bug fixes -- not found in Raven Pro 1.4. If your computer has a 32 bit operating system, you will want to install 32 bit Raven Pro, and if your computer has a 64 bit operating system, you may install both 32 bit and 64 bit versions of Raven Pro. For a comparison of these options, read http://www.birds.cornell.edu/brp/rav...nloadBeta.html.

You can download a Raven Pro installer from http://www.birds.cornell.edu/raven, click on the Downloads button on the left side of the web page, and then follow the directions for downloading that are included on that page.

To register your copy of Raven Pro 1.5 and enable all of its features, follow these steps:

1. Download and open one of these Java 8 installers from https://java.com/en/download/manual.jsp
* Windows Offline - if you are installing 32-bit Raven Pro
* Windows Offline (64-bit) - if you are installing 64-bit Raven Pro
* Mac OS X
* Linux x64

2. Download a Raven Pro 1.5 installer by visiting the Raven homepage, click on "Raven Pro" in the top-right corner, and click on the "full download" link for your computer.

3. Open the Raven Pro installer.
* Windows tip: Install on the default path
* Mac OS X tip: Install while logged in as an administrator

4. Open Raven Pro.

5. Copy your serial number and paste it into the Registration GUI.

6. Click the Register button.

The Raven Pro 1.4 user's manual (also essential for Raven Pro 1.5) can be opened from the "Help" menu. You will find information about some new features of Raven Pro 1.5 at http://www.birds.cornell.edu/brp/rav....5Features.pdf.

The Bioacoustics Research Program offers a five-day introductory-level Sound Analysis Workshop at the Cornell Lab of Ornithology (Ithaca, NY) featuring Raven Pro 1.5. The workshop is offered twice per year (spring and fall), and is intended primarily for biologists interested in analysis, visualization, and measurement of animal sounds. The workshop covers basic principles of spectrographic analysis and measurement of animal sounds, as well as specific tools and techniques in Raven Prof. For more information, please go to http://www.birds.cornell.edu/page.as...3#BRPRevised=2.

To obtain technical support, email raven_support@cornell.edu. We also have a help and discussion forum at http://help.ravensoundsoftware.com/.

You can like us on Facebook at "Bioacoustics Research Program, Cornell" to stay updated on issues related to bioacoustics, whales, elephants, biodiversity, and Raven software.

You can find guidance about how to cite Raven at http://www.birds.cornell.edu/brp/rav...nCitation.html.

Thank you, and all the best for your work.

Regards,
Mike

---------------
Raven Project
Bioacoustics Research Program
Cornell Lab of Ornithology
159 Sapsucker Woods Road
Ithaca NY 14850

Raven sound analysis software:
http://store.birds.cornell.edu/Raven_s/20.htm
http://RavenSoundSoftware.com

Bioacoustics Research Program and Elephant Listening Project
http://www.birds.cornell.edu/brp/
http://www.listenforwhales.org/
http://www.birds.cornell.edu/brp/elephant/
http://www.facebook.com/BioacousticsResearchProgram/

-Mike
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  #3  
Old 03-21-2017, 05:18 PM
Laela Sayigh Laela Sayigh is offline
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Join Date: Aug 2013
Posts: 9
Default Re: Center frequency measurements seem innacurate

Here are two screenshots that show the same center frequency, one has much more high frequency energy. Neither really seem like they should have a center frequency that low, we have other calls with the same center frequency that make more sense. I don't see that half of the energy could be below 24 Hz.
Attached Images
  
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  #4  
Old 03-21-2017, 07:17 PM
Michael Pitzrick Michael Pitzrick is offline
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Join Date: Sep 2008
Posts: 233
Default Re: Center frequency measurements seem innacurate

Quote:
Originally Posted by Laela Sayigh View Post
Here are two screenshots that show the same center frequency, one has much more high frequency energy. Neither really seem like they should have a center frequency that low, we have other calls with the same center frequency that make more sense. I don't see that half of the energy could be below 24 Hz.
Hi Laela,

The images you attached do not have a high enough resolution for me to make out much. Is there any chance you could attached some larger images? In case you aren't familiar with Raven's ability to export images from the user interface, please see page 18 of the Raven Pro Users' Manual, which you can access from the Help menu in Raven.

-Mike
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  #5  
Old 03-22-2017, 09:34 AM
Laela Sayigh Laela Sayigh is offline
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Join Date: Aug 2013
Posts: 9
Default Re: Center frequency measurements seem innacurate

Here are higher resolution images.
Thanks,
Laela
Attached Images
  
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  #6  
Old 03-22-2017, 02:17 PM
Michael Pitzrick Michael Pitzrick is offline
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Join Date: Sep 2008
Posts: 233
Default Re: Center frequency measurements seem innacurate

Quote:
Originally Posted by Laela Sayigh View Post
Here are higher resolution images.
Thanks,
Laela
Hi Laela,

My apologies. These images look similar to the ones you sent before, and vBulletin reports that the jpg file sizes, 52.1 KB and 52.0 KB, are only about 5% bigger than your last ones.

Let me make a guess about what's going on based on similar requests in the past. Center Frequency is the frequency at which half of the sound energy in a given selection box is below and half is above. It is often the case that ambient noise increases as sound frequency decreases. Not infrequently, the same is true for your signal of interest. When increasing the height of a selection box, once it's cleared where most of the energy is, center frequency doesn't change much if at all.

I'd be happy to give you an answer based more specifically on your situation if you can provide me with a higher-resolution image. It may be that vBulletin is somehow preventing you from doing so. Would you be willing to submit your issue to raven_support@cornell.edu, and attach your images to the email? Hopefully, your email server has fewer file size restrictions than vBulletin. We can post back to the Forum once we've resolved the issue.

Does that work for you?

-Mike
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