System for detecting gunshots

Details System for detecting gunshots System for detecting gunshots

1999-02-19

2000-09-05

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

367118, 367906, G01S 380

Patent

active

061153273

ABSTRACT:
A system for detecting gunshots includes an input device including a microne for converting acoustic noises into signals and amplifiers for amplifying the input signals, a threshold detector for receiving the amplified signals and comparing the signals with a predetermined threshold value and for producing an output signal when the threshold value is exceeded. A pulse width detector is connected to the threshold detector for producing an output signal only if the width of the threshold detector output signal is within a predetermined range of values. A pulse count detector is also connected to the threshold detector for producing an output signal when the level of the threshold output signal is above a peak threshold level or the number of threshold level output signals that exceed a threshold level are less than a preset limit. An output device indicates that a gunshot has occurred only when signals are received from the pulse width detector and the pulse count detector during a sampling period.

REFERENCES:
patent: 5455868 (1995-10-01), Sergent et al.
patent: 5504717 (1996-04-01), Sharkey et al.
patent: 5703835 (1997-12-01), Sharkey et al.
patent: 5917775 (1999-06-01), Salisbury

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