1974-01-15
1976-02-17
Safourek, Benedict V.
325363, H04B 146
Patent
active
039394204
ABSTRACT:
Method and apparatus for detecting the presence of a surreptitiously placed radio transmitter or bug. An audio tone signal is transmitted within the confined space containing the bug, and the tone signal has a predetermined frequency and a predetermined amplitude. The tone signal energizes the microphone of the bug, causing it to transmit a radio frequency signal which is modulated according to the tone signal. The radio frequency is then demodulated and the resulting demodulated signal is applied to a narrow pass band filter which is tuned to the audio tone signal. The output of the filter is sensed to determine the presence of the bug.
REFERENCES:
patent: 3239761 (1966-03-01), Goode
patent: 3320535 (1967-05-01), Broadhead, Jr.
patent: 3462554 (1969-08-01), Steel, Jr.
patent: 3466652 (1969-09-01), Heyser
patent: 3473127 (1969-10-01), Williams et al.
Brundin Bengt
Lindgren Alf
Risberg Sture
Rixon Kjell
Wallden Rickard
Risberg Sture
Safourek Benedict V.
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