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Automated recording of bat calls
The batcorder is the worldwide first data recorder that distinguishes bat calls from other sound sources in real-time (online signal analysis). Calls are recorded digitallyas call sequence. Thus, bat calls can easily be sampled automatically at nearly every possible location. Bush crickets and other sounds (wind, water, rustling of leafs, ...) are under most circumstances not recorded at all. Available in its third generation.
The batcorder was developed specifically to be used as autonomous recording device in the field. It is not a conventional bat detector, bat calls are not played over headphones or loudspeaker. In contrast to other such devices each batcorder and its microphone are calibrated for a fixed sensitivity. Thus, the comparison of activity recorded at different locations is guaranteed.
Using state-of-the-art technology made this bat detector possible. Recordings are stored on SDHC card, these are also used in many modern photo and video cameras. The batcorder samples sound at 500 kHz with 16 Bit amplitude resolution. Thus, it uses 1 MB of memory per second of sound recording. A SDHC card of 16 GB of memory allows to store around 15.000 typical bat recordings (each with approximately one second of duration). This is sufficient for activity sampling of 5 to 20 consecutive nights at most ground based locations. Setup on wind turbines recordings of more than 30 days usually fit onto the 16GB SDHC card.
Development of the batcorder was focused on simple usage of the device as well as on the omission of unnecessary functions. That way costs were minimized and run time was maximized. The batcorder is optimized for autonomous usage and its casing is weatherproof. Through intelligent algorithms and low-power consuming parts the batcorder reaches run-times of up to 220 hours with the supplied, external NiMH battery pack (6V / 2.4 Ah) + internal battery. This typically resembles 8 to 14 nights of usage in Auto+Timer mode.
The batcorder is easy to use in your field work. The most important feature for you is recording bat calls, three different recording modi exist and are shortly explained here. For more details we invite you to download the batcorder manual.
The batcorder starts up at a user-chosen time (usually in the evening), and starts a recording when it encounters a valid call event. It then saves the incoming sound for as long as further calls are recognized within a chosen time interval (posttrigger time). At a user-chosen time (usually in the morning) the batcorder stops sampling again and shuts down to save battery power.
This mode is equivalent to the Auto+Timer mode, but the scanning for calls has to be initiated manually. The timer is deactivated and the batcorder runs until switched off again.
In this recording mode the call recognition algorithm is deactivated. Recordings are started/stopped manually by pressing the Rec key.
The microphone rod (or disc respectively) holds a temperature sensor. This is queried every 15 minutes for the actual temperature which is added to the logfile. bcAdmin then extracts the temperatures for min and max values for each session. In addition the recording temperatures are interpolated. Various outputs are available as for example a graph giving activity in correlation to temperatures.
The batcorder can be delivered including a battery pack (incl. charging electronics and charger) and a cordura case for camouflage as well as protection and simple setup in the field. There is also an option without the accessories.
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