Device for preventing eavesdropping through speaker
US7920822B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2008 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Jul 25, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K2203/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Provided is a device for preventing eavesdropping through a speaker. More particularly, a device for preventing eavesdropping by transmitting a jamming signal through a speaker common signal line is provided, the device including: a jamming signal generator for generating a jamming signal comprising a noise signal; an amplifier for amplifying the jamming signal; and a transformer for receiving the amplified jamming signal from the amplifier and outputting the amplified jamming signal to a speaker common signal line. The device may transmit a jamming signal in an audible frequency band to the speaker common signal line, thereby rendering conversations unrecognizable to eavesdroppers when an electrical signal induced from a speaker is detected through the speaker common signal line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.