Am 18.04.2020 um 18:25 schrieb Ted Park:
I don't know where I can find bats nearby so I couldn't try it but how does it work? The book makes it sound like you can use any mic, even one built into a laptop for this? I suppose that's plausible looking at a typical mic's frequency response graph, they are just cut off at 20khz, and don't roll off after 20khz like I thought they would, but what about the sample rate? At 44.1kHz doesn't that mean anything over 22khz is more aliasing or harmonic distortion than an actual recording of bat sounds?
The sounds of those bats that I did record were in the 12kHz to 15kHz range. 44.1kHz sample rate is sufficient. I did use two Rode NT1 microphones, connected to a Tascam DR-70D recorder. If I record the ultrasound in the recorder, I use 48kHz sample rate. If live processing is required, I connect the Tascam's output to my notebook's audio input, which has only 44.1kHz sample rate. That works as well. It is important that you disable the low pass filter in the Windows control panel (properties of the microphone).
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