Bloodhound is a fully portable, acoustically stimulated, wired microphone detection system developed by government engineers.
It operates by detecting the audio signal from a microphone and subjecting it to high amplification with elaborate filtering to remove extraneous noise.
The system has two modes of operation: a covert (or passive) and an overt (or active) mode.
In covert mode, the operator uses the filter and headset units to listen for room noises as detected by the eavesdropping microphone. A properly conducted covert search can be carried out in an environment with staff present and will not alert the listening post. |