System for masking microphonic voice signals in wired telecommunications equipment
US7024175B1 · kind B1 · utility
3Cited by
22References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2000 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | May 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/68
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system to thwart eavesdropping on microphonic audio signals generated by a powered telecommunications device connected to a communications line, comprising a noise generator for applying low level noise to the line, thereby masking microphonic audio signals, and a disconnect circuit for disconnecting the telecommunications device from the line in the absence of power to the telecommunications device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.