Device for preventing eavesdropping through speaker

Details Device for preventing eavesdropping through speaker Device for preventing eavesdropping through speaker

2011-04-05

2011-04-05

Lee, John (Department: 2618)

Telecommunications

Interference signal transmission

C455S067110, C455S063100, C455S067130

Reexamination Certificate

active

07920822

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.

REFERENCES:
patent: 3725595 (1973-04-01), Mechanic-Esfahani
patent: 4744103 (1988-05-01), Dahlquist et al.
patent: 5961646 (1999-10-01), Sokol
patent: 2020000015270 (2000-07-01), None
patent: 1020030079638 (2003-10-01), None
patent: 10-0643310 (2006-10-01), None
patent: 1020080065327 (2008-07-01), None
patent: 03/009499 (2003-01-01), None

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