Eric Dantan Rzewnicki wrote: >I just had a crazy idea ... Sorry if this is off topic a bit. Does >anyone know what frequency ranges bats use? Would a 96KHz 24bit card be >able to capture anything useful from their sounds? > >I was just wondering what it would sound like to get a recording of the >bats eating bugs in the evenings in my backyard and then slow it down >enough to get into a human audible frequency range. > > When I was doing my University final year project last year (I studied Electronic Engineering with Music Technology), a guy in my year was making a portable bat call recorder. I had to go and hear him do a talk on his project, and I'm struggling to remember what the important points were. I was a bit preoccupied with giving a presentation on my own project next! I think he was interested in how much he could fit onto a small media card. He said all the existing devices are either as big as a van and very expensive, or actually semi-portable but limited in quality. It all hinged on whether or not the frequency shifting was done in real-time to memory, or whether it was stored raw. I also seem to remember that my housemate and I made two suggestions - not to use Sony's memory stick (which required licensing, but was a little bit smaller), and to try FLAC lossless compression. If I can contact him, I'll try to put you in touch. I'm quite busy with work at the moment though. Sorry if this is all a little vague... Michael Nelson
