Alarm for transient underwater events

Details Alarm for transient underwater events Alarm for transient underwater events

1991-10-01

1994-01-11

Black, Thomas G.

Boots, shoes, and leggings

364506, 364508, 364574, 36472401, 381 94, G06F 1520, G06F 1531

Patent

active

052787745

ABSTRACT:
An alarm for detecting transient senic events determines an estimate of background environmental acoustic events or noise by computing a short time correlation function for individual segments of data and then subtracting an estimated mean of the correlation function. Acoustical events which represent major excursions from the measured background are detected as transient events. The background is continuously updated within selected processing periods chosen to maintain an accurate differentiation for transient events. In further aspects, the residual correlation function is generally detected using a .chi..sup.2 statistic which is computed using an estimated covariance of the correlation function and the residual correlation function for a specific window. If a given residual does not represent a detected transient event, that residual is used to estimate the mean and covariance of the background using an exponential integrator.

REFERENCES:
patent: 4423634 (1984-01-01), Audenard et al.
patent: 4604738 (1986-08-01), Aggarwal et al.

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