> The devices included high quality Ultrasonic, inductive and light
> modulated listening devices. Some of the results were stunning, and
> the standard sweep tools most of us buy in North America simply can't
> detect them.
At least to me that suggests the need for some general detection
techniques which are independent of the modulation used. Specialized
hardware for cross-correlations over many signals which are agnostic to
the type of signal being fed in come to mind. With something like that
and multimodal sensors it would be possible to passively correlate
whatever is being spoken in a room against variations in <whatever>, and
I'm reasonably sure at least the above transmission modalities would
succumb. I wonder if anybody already makes such hardware?
--
Sampo Syreeni, aka decoy - de..._at_iki.fi, http://decoy.iki.fi/front
+358-50-5756111, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
Received on Sat Mar 02 2024 - 00:57:29 CST