Device for locating audio surveillance apparatus

Details Device for locating audio surveillance apparatus Device for locating audio surveillance apparatus

1979-10-15

1981-04-28

Bookbinder, Marc E.

Telecommunications

Transmitter and receiver at separate stations

Having measuring, testing, or monitoring of system or part

343 13R, 367 2, 367127, 455228, H04B 714, H04B 1100, H04B 1700

Patent

active

042649781

ABSTRACT:
A pulse generator is provided for transmitting an acoustic pulse which is sensed by an audio surveillance device and retransmitted as modulated electromagnetic information. Associated with the pulse generator is a timing arrangement and display. The timer is triggered into operation by the generation of the acoustic pulse. The operating speed of the timer is established to be a function of the speed of sound. Means are provided to stop the timer upon receipt of a demodulated signal representative of the retransmitted pulse whereby the display indicates the distance to the surveillance device.

REFERENCES:
patent: 2568926 (1951-09-01), Moran, Jr.
patent: 2910665 (1959-10-01), Hawkins
patent: 3181154 (1965-04-01), Henne
patent: 3380049 (1968-04-01), Webb
patent: 3939420 (1976-02-01), Risberg et al.
patent: 4127817 (1978-11-01), Bell, Jr.

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