Method and apparatus for detecting and locating a concealed listening device
US5717656A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Aug 20, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and system for detecting the presence, and the location of, a concealed listening device. In the method, the acoustic signal from the actual acoustic source and electromagnetic signals in the radio frequency band (containing the electromagnetically-transmitted version of the acoustic signal on an unknown frequency) are obtained and an average cross correlation of the auto correlation of each of these two signal types is derived for determining whether a concealed listening device is even present and, if so, the frequency of the electromagnetically-transmitted version. The method then utilizes timed pulse responses of a plurality of acoustic transducers, as well as a distinguishing function, to determine the location of the concealed listening device. In the system, a controller controls the operation of a radio receiver, a microphone and an arrangement of acoustic transducers in accordance with the method described above.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.