Re: High frequency recording

["Raimund" animalsounds]

> Previous posters on the subject mentioned a 10% security margin between
> the Nyquist frequency and the highest frequencies that might be of interest.

Just another note:

Actually, the 10% security margin would only be sufficient on a few recorders 
that come with a very steep anti-aliasing filter. 

On a SD7xx recorder, operated at 192 kHz for instance, the security margin 
should be much higher. Here I would perhaps recommend something like 50%, 
depending on the frequency response of the microphone and the frequency content 
to be recorded. See also Gianni's comprehensive tests at 
http://www-3.unipv.it/cibra/res_techtest_uk.html

Regards,
Raimund