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  1. #1
    Join Date
    Mar 2012
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    Portland, OR
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    28

    Default iphone apidictor for acoustal beehive swarm detection

    Hi all,

    I'm a novice honeybee enthusiast....

    I came across an article about Eddie Woods and his acoustical swarm detection machine, the Apidictor. I was able to use the iphone app n-track for real-time frequency filtering of the hive sounds and provide a close reproduction of what I think Eddie heard. I'm not selling anything.... I'm interested in using readily available technology to study bee behavior... err beehavior..

    Here is a link the the analysis, sounds, and results: http://www.instructables.com/id/ipho...-swarm-detect/

    Eddie described a 'hiss' and a 'warble' occurring at different frequencies. The hiss occurs above 3,000hz after knocking the hive with an open hand. The warble occurs at around 250hz and is an indicator of hive problems.

    I was able to record two different hives in the above 3,000 hz range and the knocks were followed by a nice audible hiss in most cases. Out of about 9 knocks I would get 3-4 strong hisses and more hisses could be detected after further sound amplification on the PC using the free software Audacity. This makes sense as it is still winter here in Portland, Oregon and there should not be any preparations for swarming. I also recorded to hives in the 250 hz frequency and did not hear any warbling. There was a low drone. I'm looking forward to hearing some warbling as we move into spring in summer.
    Last edited by hydronics; 03-07-2012 at 12:24 PM.

  2. #2
    Join Date
    Apr 2010
    Location
    San Diego, California, USA
    Posts
    2

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I found the US patent (2806082) for the subject device; the patent may have more information to assist your efforts. Here is a link to the patent:
    http://www.google.com/patents?id=Ke1...ed=0CDQQ6AEwAA

  3. #3
    Join Date
    Feb 2012
    Location
    Baton Rouge, LA
    Posts
    12

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I am curious how you set the n-track app to 250hz. I have it installed, but it doesn't give feedback as to where the filter is set?

  4. #4
    Join Date
    Feb 2012
    Location
    Baton Rouge, LA
    Posts
    12

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I think I get it. After some controlled whistling into my phone I was able to see that once a specific note is hit the app clearly shows what frequency it is hearing. That said I need to do as suggested and hook it up to a microphone because the background noise is drowning out the bees. Also after counting 15 or so swarm cells on the edges of brood nest comb the point is moot! :-)

  5. #5
    Join Date
    Mar 2012
    Location
    Portland, OR
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    28

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I've been looking at that patent.. there are a few people that have made progress implementing the design with today's available audio amplifiers but no one has shared this information on the internet so far... This guy has done some cool modeling of electronic filters :

    http://www.dave-cushman.net/elect/ap...rfiltchar.html

  6. #6
    Join Date
    Mar 2012
    Location
    Portland, OR
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    Default Re: iphone apidictor for acoustal beehive swarm detection

    Barrett... If you could record some of the noise at 250hz it would be neat to hear... I was able to put a mic up against the ventilation opening and get a good indication of noises... I've not been able to record a hive preparing to swarm as it is cold hear in Oregon... Let me know how it goes..

    FT8BFIXGZAD1GZT.MEDIUM.jpg

  7. #7
    Join Date
    Feb 2012
    Location
    Baton Rouge, LA
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    12

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I split my colony the other day so I don't know if I'll be able to detect any swarm noise, but I did run out and get a better microphone today. Unfortunately I have to go out of town for the next few days and won't be able to gather any data. I should be able to get some recordings next week though. I have also been looking through the app store and found some apps that may help with this. Also based on looking at some other sound data and band charts on the web I think you may have set the filter to far to the left (low) and may not have been capturing the correct frequency. Just an observation. I'll be able to compare when I have more time.

  8. #8
    Join Date
    Mar 2011
    Location
    St.Francis County, MO USA
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    45

    Default Re: iphone apidictor for acoustal beehive swarm detection

    The problem is the Iphone speaker/mic does not operate at that range..so..Frequency response: 20Hz to 20,000Hz

  9. #9
    Join Date
    Mar 2012
    Location
    Portland, OR
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    Default Re: iphone apidictor for acoustal beehive swarm detection

    Heartspark... what range does the Iphone speaker/mic operate at? cheers, tom

  10. #10
    Join Date
    Jan 2014
    Location
    Manassas, Virginia, USA
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    964

    Default Re: iphone apidictor for acoustal beehive swarm detection

    Hydronics,

    I've been in a PM chat with HIVE+ on this subject. I'm new, too, but came to the same conclusion. There's an app for that.

    You really need to look down way below 3 kHz and see if you can clearly discriminate that nurse bee tone. A good baseline will be needed to see that change relative to the other buzzes going on. I'd also expect a strong temperature dependence as the need to ventilate the hive changes.

    This is clearly a job for a Fast Fourier Transform (FFT) spectrum analyzer. There are spec-annie apps for smart phones. A friend of mine and I were supposed to be testing vibration on a UAV one day. I was setting up a $5700 oscilloscope and an accelerometer to do the job, and he was standing around messing with his i-phone. I was getting steamed, when he stuck his toy on the wing, gave the plane a rock, and got a better frequency plot that the scope could make! He'd managed to couple the accelerometers in the phone to an audio FFT app. Who'da-thunk-it?

    Option 2, plug a microphone into your laptop and use a freeware FFT spectrum analyzer program. There is no shortage of them available.

    Option 3, for electronics types, there is no shortage of digital oscilloscopes with FFT functions these days. Yeah, these go for about $1000 and up, but they're standard equipment for serious electronic work.

    I can't wait for spring. This I gotta try.

  11. #11
    Join Date
    Mar 2012
    Location
    Portland, OR
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    Default Re: iphone apidictor for acoustal beehive swarm detection

    Hi Phoebee, An acquaintance of mine, James Moore is working on an iphone app. to listen for the 250hz sounds. Here's what he's done so far. You can feel free to contact him as you go further. He's really interested in perfecting the app. cheers, thomas

    http://jmoore.me/apps/swarmy/

  12. #12
    Join Date
    Jan 2014
    Location
    Manassas, Virginia, USA
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    964

    Default Re: iphone apidictor for acoustal beehive swarm detection

    I don't think it will run on my $15 Tracfone.

    I've got a sound editing program on a laptop that has an FFT analyzer. I swiped some hive noise off a YouTube video and can distinguish a broad peak centered at 240 Hz, plus some others. It shows up better if you use some time-averaging, or store the peak levels.

    Most of the available programs for PCs are intended for real-time analysis from a live input. Perfect for a live reading, awkward to use on a recording.
    Last edited by Phoebee; 02-10-2014 at 08:12 AM.

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