Hi Smythe,
I don't know about the .bin format, but I know that you can download an eval version of Cool Edit Pro (edits sound files) from www.harmonycentral.com in particular:
http://www.harmony-central.com/Software/Windows/audio_editing.html
if you're using windows. Never used it myself...
Hi,
Here's an idea. Use a low pass filter (see Maxim for a good assortment of filter types and pole numbers) to make your 1800 Hz cutoff frequency. Then use further amplification and a comparator to re-create your square wave pulses after the filter.
Good luck,
Stan
What you're looking for is a spectrometer. Look at a company called "Ocean Optics" for an idea of some small versions. It is basically a diffraction grating and a long array of photodiodes, arranged such that each spectrum line falls on a different photodiode. Do some multiplexing...