Same file as above, now "zoomed in" to show more detail. This is a higher quality recording than example 1 as we can resolve some of the individual chirp shapes. We can see the fundamental frequency where this bat likes to put a lot of power over a longer period of time is around 43 kHz.
Same file as above but "zoomed in" at maximum detail on a single chirp. Unfortunately this a relatively poor quality recording and the structure of the chirp cannot be resolved.
Same file as above, now "zoomed in" to fill the screen. At the beginning of the sequence the pulses alternate in strength probably because the bat is turning it's head. Towards the end of the sequence the pulses significantly speed up, probably on approach to a tasty insect.
Same file as above, now "zoomed in" to show about 3 seconds of the file. Enough detail is revealed to show this bat is sweeping it's calls from a bit over 60 kHz down to 40 kHz.
Another recording a few minutes later. This file is showing just a little over 2 seconds of time, though quite a number of chirps are packed into this sequence.
5.75 second bat call sequence recorded by John Chenger in Monroe County, Ohio August 2011.
"40 kHz Myotis"
Baton + BatScan Sample 1
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Baton Bat Detector
Simple and versatile bat detection
Listen to bats in real-time! The Bat Baton is a simple but versatile “frequency division” bat detector that allows users to hear the live ultrasound that is produced by echolocating bats. This is accomplished through the front-facing monitoring speaker which emits frequency-divided calls of bats echolocating between the range of 20 to 120kHz. The division factor is 10, which reduces the sounds of a 50kHz bat to 5kHz—well within the range of human hearing! When attached directly to a laptop computer using a 3.5mm stereo jack cable, real-time sonograms can be viewed using the included BatScan sound analysis software. For more private listening, the 3.5mm jack can also be used with headphones.
The Baton retains the original amplitude of the calls recorded, allowing 3D analysis of bat calls (time, frequency, intensity) and can be collected on other devices such as an MP3 recorder for later analysis. The Baton is also ideal for listening to Orthoptera (grasshoppers and crickets) whose communication is at or above the upper range of human hearing. One PP3 9V battery lasts up to 30hrs (alkaline).
Baton Bat Detector Specifications
Baton XD Bat Detector
An advanced bat detector that is affordable and easy to use.
Much like its predecessor, the Bat Baton XD is another affordable, durable device that serves as a great introduction into bat acoustics. Boasting the same tried and true design and frequency division technology as the standard Baton, the Baton XD comes with a time expansion feature.
Frequency reduction of bat calls is accomplished in two ways-- frequency division, which divides the ultrasonic sound spectrum and time expansion; where the Baton XD, having selected the optimum few calls of the bat pass, instantaneously creates a high speed digital recording and then immediately plays it back 10 times slower. The output can be sent to any recording device, including iPhone and Android phones, for instant or future spectrum analysis.
To accurately identify bat species from calls, four of the essential measurement criteria required are bandwidth, repetition rate, call shape, and relative intensity. The Baton XD provides all of this information via its two simultaneous modes. Both modes retain amplitude information and frequency bandwidth. The call repetition rate is available from frequency division and a more detailed output of call shape is provided by time expansion.
The Baton XD is packed with the very latest advanced circuitry in a very small device and yet it only consumes 20mA. Battery life, even with a standard alkaline battery, is above 20 hours (depending on use) but can be considerably extended by using a lithium battery to around 60 hours.
Baton XD Bat Detector Specifications
BCM's take on the Baton
The Baton is by far the least expensive bat detector on the market that gives a relatively accurate representation of a bat pass in real time. The next closest bat detector that provides real time sonogram displays costs approximately $600!
Unlike other bat detectors in this price range (which are heterodyne only) the Baton is remarkably well made, lightweight, and feels durable in the hand.
Although the built in speaker may not produce enough volume to effectively demonstrate to a large group, the Baton performs very well in small group setting and when used during interpretive programs.
The real advantage is the Baton’s frequency division technology with the real time sonograms. There is absolutely nothing like this available at such a low price point. This really allows you to not only hear the bats go by but also "see" them, save them, and would be the perfect introduction to the acoustic world of bats without investing in a $1000 unit. For even greater versatility, the Baton XD will also play back the time expanded bat calls, and when paired with an external recording device, can be used for later analysis or viewing in several third-party apps available on smart-phone or tablet.
Please note: while this frequency division (with amplitude) detector's output is best viewed using the included BatScan software, this device is not intended for precise species identification. They can be used for passage rates at mine entrances, etc. and applications where exact species ID is not important. However,Šyou will easily be able to sort bat passes into their acoustic guilds, andŠwith practice and knowledge of your local bats, you may be able to sort to species.
BatScan Analysis Software
Baton Bat Detector: $159.00 USD
Includes BatScan for Windows
Protective carry pouch
Shipping charge will be calculated during checkout.
Baton and Baton XD
Affordable and surprisingly powerful bat detector
Bat Conservation and Management, Inc. Carlisle, Pennsylvania (717) 241-ABAT
"40 kHz Myotis Feeding"
Baton + BatScan Sample 2
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to listen to this recording