Telecommunications – Interference signal transmission
Reexamination Certificate
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.
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patent: 3725595 (1973-04-01), Mechanic-Esfahani
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patent: 5961646 (1999-10-01), Sokol
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Cho Sang Woo
Chu Kwang Uk
Hwang In Ho
Kim Jong Kyu
Lee Dae Heon
Electronics and Telecommunications Research Institute
Ladas & Parry LLP
Lee John
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