Signal enhancement system

Details Signal enhancement system Signal enhancement system

1971-03-19

1979-03-06

Birmiel, Howard A.

Communications: electrical

Selective

Intelligence comparison for controlling

340 6R, 324 77A, 343 5SA, H04G 1100

Patent

active

041433505

ABSTRACT:
A signal enhancement method and apparatus including a computer arranged to process underwater signals at discrete spectral intervals for facilitating spectral signature recognition of submarines. An average of the spectral intensities of broadband noise on either side of the discrete spectral interval is computed and then subtracted from the spectral intensities of the specific narrow-band frequencies generated by the submarine, thereby eliminating any false combinations of nonrandom sidebands with random background noise. The remainder is then integrated with time producing a continuously increasing cumulative energy level of the discrete spectral interval when the energy thereof is originating from the submarine.

REFERENCES:
patent: 3344881 (1967-10-01), White
patent: 3656097 (1972-04-01), Massa
patent: 3790927 (1974-02-01), Chwastyk
Protter & Morrey, College Calculus with Analytic Geometry, Addison-Wesely bl., 1966.

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