tag:blogger.com,1999:blog-8042569099194536366.post7536814904829488110..comments2024-03-28T16:17:52.532+00:00Comments on Captain Bodgit: DodoPi Bat Recorder: "hey, we have a live one!"SteveDeehttp://www.blogger.com/profile/10645378028590228663noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-8042569099194536366.post-12024493787844116952019-09-30T10:59:01.990+01:002019-09-30T10:59:01.990+01:00Thanks, that's interesting.
I think each puls...Thanks, that's interesting.<br /><br />I think each pulse/call happens when the wings come down. The call length and duration is probably influenced by the bat size; hence small bats tend to have shorter call lengths and often higher repetition rates.SteveDeehttps://www.blogger.com/profile/10645378028590228663noreply@blogger.comtag:blogger.com,1999:blog-8042569099194536366.post-58371036549276083772019-09-29T16:08:40.161+01:002019-09-29T16:08:40.161+01:00Someone on the radio 4 "in our time" ech...Someone on the radio 4 "in our time" echolocation podcast pointed out that bats lungs are worked by their wing muscles so they get their calls energy free if they are flying.BGissuehttps://www.blogger.com/profile/17579596895700437538noreply@blogger.comtag:blogger.com,1999:blog-8042569099194536366.post-39240671685852651592019-03-03T12:34:38.716+00:002019-03-03T12:34:38.716+00:00Oh, and this may also be of interest: https://www....Oh, and this may also be of interest: https://www.mdpi.com/1424-8220/19/3/553/htm<br />SteveDeehttps://www.blogger.com/profile/10645378028590228663noreply@blogger.comtag:blogger.com,1999:blog-8042569099194536366.post-31366779358411464152019-03-03T12:06:32.680+00:002019-03-03T12:06:32.680+00:00I suppose the first question is what is your objec...I suppose the first question is what is your objective?<br /><br />Unfortunately I still don't know why I'm doing this, but I'd estimate its 2 thirds about designing a system and getting it working, and 1 third about recording bats and trying to work out what they are and what they are doing.<br /><br />I don't know much about AudioMoth but it looks pretty good and has low power requirements. Naturally when used as a bat recorder you will need to set rate to 192kHz or above.<br /><br />You are probably already aware of their forum: https://www.openacousticdevices.info/support/<br />...and I'd also suggest you join the Facebook group: Bat Call Sound Analysis Workshop<br />...and post your question there, as there are certainly a few AudioMoth users in this group.<br /><br />In my opinion, no system is capable of 100% accuracy when identifying bat species. Call variation and overlap between species appear to make this impossible at the present time. And manual identification is down to judgement (e.g. I'm 90% sure its bat A but it could be C or D). However, I suspect your 'invisible' interest in bats is like your 'visible' interest in garden birds.<br /><br />If I understand correctly, these are priced at $80, which is much cheaper than my Dodotronic mic. One disadvantage of both AudioMoth & Dodo is the lack of a high pass filter. Being so close to a main road, the odd boy-racer can saturate the a-d converter. I still haven't had a chance to test my cheap mic + preamp + Wolfson + Pi, which should filter out the traffic noise.<br /><br />Take a look at Arnold Andreasson's comments here: https://github.com/cloudedbats/cloudedbats/blob/71f8f3cc840d1a23a2a67457137c55bed3a95d9a/doc/EABDW3_Three_Inexpensive_Bat_Detectors.pdf (you have to download the PDF to read it). He also mentions the lack of a high pass filter and some distortion as negative points for the AudioMoth.<br /><br />Also look at his 'Clouded Bats' project (lots of Python code): https://github.com/cloudedbats/cloudedbats<br /><br />Arnold likes to receive email on this subject, but he is a busy-boy, so may take a while to get back to you.<br /><br />I hope some of this is helpful, but do come back if you have more questions.SteveDeehttps://www.blogger.com/profile/10645378028590228663noreply@blogger.comtag:blogger.com,1999:blog-8042569099194536366.post-58334145052127397952019-02-28T23:24:18.860+00:002019-02-28T23:24:18.860+00:00What are your thoughts about this:
https://www.ope...What are your thoughts about this:<br />https://www.openacousticdevices.info/audiomoth<br />example python application:<br />https://github.com/macaodha/batdetectNestBoxTechhttps://www.blogger.com/profile/17596961979586589583noreply@blogger.com