As for ultrasound; first workable idea =

1. Pic up the inbound ultrasound via mic/scanner
https://www.zachpoff.com/resources/cheap-microphones-for-ultrasound/
2. Send the ultrasound digital signal to a signal processor and convert to audible audio.
https://en.wikipedia.org/wiki/List_of_Bioacoustics_Software
3. Play standard ALARM followed by audible audio file from 2. above.

= a simple ATTACK DETECTION AND INSTANT (aural) ANALYSIS SYSTEM


Parts e.g.:
https://micbooster.com/14-ultrasonic-microphones
https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2047675.m570.l1311&_nkw=ultrasound+scanner&_sacat=0

hardware generally, e.g.:
https://fluxworkshop.com/

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