Detection method and apparatus

Details Detection method and apparatus Detection method and apparatus

1987-10-28

1995-11-21

Pihulic, Daniel T.

Communications, electrical: acoustic wave systems and devices

Receiver circuitry

367118, H04B 106

Patent

active

054694051

ABSTRACT:
The detection of a microphone within a selected site includes broadcasting an acoustic signal having two components with different frequencies selected to produce the re-broadcast, by a microphone in the broadcast field, of a selected resonant responsive signal, and sensing the re-broadcast of such a responsive signal. Determining the direction in which such a responsive signal is sensed determines the location of a microphone detected to be present within the selected site.

REFERENCES:
patent: 3705381 (1972-12-01), Pipkin
patent: 4264978 (1981-04-01), Whidden
patent: 4399556 (1983-08-01), Whidden

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