Okay, last post for the night.... The more I read about this, the more and more it sounds really cool.
So, you software and hardware engineer people out there - what do you think? Can it work to better clean up night flight call data collection? Heck, this could get you closer to that 90-95% positive detection figure we'd all like to see. http://plaza.ufl.edu/badavis/EEL6502_Project_1.html Sincerely, Chris T-H Chris Tessaglia-Hymes wrote: > I think the idea with adaptive noise cancellation is this: > > you have a dual microphone system. One channel is the primary channel > (collecting the target sounds). The second channel is the "noise > collection" channel. Through some mathematical algorithms, you > subtract the noise collected in the "noise" channel from the primary > channel (e.g., a different microphone aimed at collecting the cricket > sounds or the katydid sounds, perhaps using a slightly lower gain > setting, so as /not /to pick up distant flight calls being collected > in the primary channel). The resulting signal in the primary channel > should have reduced cricket and katydid sounds. Well, that's the > theory, I guess. > > Here's an older paper abstract from 1975. Current technology can > probably do this adaptive noise filtering in very real-time. > > http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=1451965 > > Sincerely, > Chris T-H > > Michael Lanzone wrote: >> It's worth playing with... I would be worried about loosing thrushes >> and other spp in 3-5kHz range in the mix though, but if it worked >> well would solve a huge problem. >> >> Mike >> >> Sent from my iPhone >> >> On Aug 21, 2009, at 10:09 PM, Chris Tessaglia-Hymes >> <c...@cornell.edu> wrote: >> >>> Aha! I did a little searching. It looks like it is possible to >>> cancel out the unwanted sounds, real-time. My first result was this, >>> which describes adaptive noise cancellation technology: >>> >>> http://www.developer.com/java/other/article.php/3599661 >>> >>> Sincerely, >>> Chris T-H >>> >>> Chris Tessaglia-Hymes wrote: >>>> So, the question is: can the unwanted cricket and katydid sounds be >>>> removed from the audio channel at the time of sound acquisition, >>>> real-time, such that their acoustic signatures are minimized or >>>> eliminated altogether from the collected sound data prior to an >>>> automatic detector batch process? >>>> >>>> Sincerely, >>>> Chris T-H >>>> >>>> Michael Lanzone wrote: >>>>> No software we have worked with gets near 100%. I have toyed >>>>> around with templates that got 95% of the calls, and detectors can >>>>> get ~90%, but more commonly get in the 60-80% range. In Louisiana >>>>> with the insects it would be on the low end of this. Katydids and >>>>> such are problematic for detectors... >>>>> >>>>> Best, >>>>> Mike >>>>> >>>>> Sent from my iPhone >>>>> >>>>> On Aug 21, 2009, at 7:43 PM, Erik Johnson <ejoh...@tigers.lsu.edu> >>>>> wrote: >>>>> >>>>>> Hi All, >>>>>> >>>>>> I've been recording from my home in south Louisiana with set-ups >>>>>> like >>>>>> Chris and David over the last few years. I've been using the >>>>>> oldbird >>>>>> software (tseep, etc), but only get about 20% of the flight calls >>>>>> that >>>>>> I would otherwise detect by ear (and visually on spectrographs). >>>>>> Not >>>>>> only is the detection software missing many calls, it's also >>>>>> underestimating the richness that I could get. In one of my best >>>>>> fall >>>>>> nights I more than doubled the species richness by listening through >>>>>> the entire night compared to running it through the software. >>>>>> What's >>>>>> also frustrating is that I get a TON of trash clips - many more than >>>>>> birds clips. I've tried to filter out background noise (which is >>>>>> mostly insects and air conditioning units) before running the file >>>>>> through the auto-detect software, but it doesn't change the results >>>>>> much. I haven't toyed with the other programs that have been >>>>>> mentioned in this threat, but as I understand it, they also don't >>>>>> get >>>>>> near 100% - or am I wrong - it sounds like this technology improving >>>>>> quickly. This list serve is giving me new inspiration to hook up >>>>>> the >>>>>> mic this fall and to play around with more settings and >>>>>> programs. I'm >>>>>> eager to see the upcoming manuscript and to hear everyone's thoughts >>>>>> on this subject! >>>>>> >>>>>> Happy listening, >>>>>> Erik Johnson >>>>>> Lafayette, LA >>>>>> ejoh...@lsu.edu >>>>>> >>>>>> -- >>>>>> NFC-L List Info: >>>>>> http://www.NortheastBirding.com/NFC_WELCOME >>>>>> http://www.NortheastBirding.com/NFC_RULES >>>>>> >>>>>> http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html >>>>>> -- >>>>> >>>>> -- >>>>> NFC-L List Info: >>>>> http://www.NortheastBirding.com/NFC_WELCOME >>>>> http://www.NortheastBirding.com/NFC_RULES >>>>> >>>>> http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html >>>>> -- >>>>> >>>> >>> >>> -- >>> ============================================= >>> Christopher T. Tessaglia-Hymes >>> TARU Product Line Manager and Field Applications Engineer >>> Bioacoustics Research Program, Cornell Lab of Ornithology >>> 159 Sapsucker Woods Road, Ithaca, New York 14850 >>> Voice: 607-254-2418, FAX: 607-254-2460 >>> http://www.birds.cornell.edu/brp mailto:c...@cornell.edu >>> ============================================= >>> >>> >>> -- >>> NFC-L List Info: >>> http://www.NortheastBirding.com/NFC_WELCOME >>> http://www.NortheastBirding.com/NFC_RULES >>> >>> http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html >>> -- >> >> -- >> NFC-L List Info: >> http://www.NortheastBirding.com/NFC_WELCOME >> http://www.NortheastBirding.com/NFC_RULES >> >> http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html >> -- >> > > -- > ============================================= > Christopher T. Tessaglia-Hymes > TARU Product Line Manager and Field Applications Engineer > Bioacoustics Research Program, Cornell Lab of Ornithology > 159 Sapsucker Woods Road, Ithaca, New York 14850 > Voice: 607-254-2418, FAX: 607-254-2460 > http://www.birds.cornell.edu/brp mailto:c...@cornell.edu > ============================================= -- ============================================= Christopher T. Tessaglia-Hymes TARU Product Line Manager and Field Applications Engineer Bioacoustics Research Program, Cornell Lab of Ornithology 159 Sapsucker Woods Road, Ithaca, New York 14850 Voice: 607-254-2418, FAX: 607-254-2460 http://www.birds.cornell.edu/brp mailto:c...@cornell.edu ============================================= -- NFC-L List Info: http://www.NortheastBirding.com/NFC_WELCOME http://www.NortheastBirding.com/NFC_RULES http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html --
