Device for identifying noise sources

Details Device for identifying noise sources Device for identifying noise sources

1971-03-30

1978-10-24

Tudor, Harold

Communications: electrical

Selective

Having electron beam device

340 22, G08B 1300

Patent

active

041224329

ABSTRACT:
A system for identifying an object, and in particular a vehicle, by analyzing the noise spectrum emitted thereby to determine the basic noise characteristic thereof and then comparing the basic noise spectrum signal with known basic noise spectra. The noise from the object, which includes both the basic noise characteristic and other superimposed noise, is detected and converted to an electrical analog signal which is then sampled. The sampled electrical signal, preferably after passing through an analog to digital converter, is sequentially converted into its orthogonal components in the frequency domain, e.g. by means of a Fourier conversion, converted into a signal with the logarithms of the noise spectrum components, and then reconverted into a signal of the noise spectrum components in the time domain, e.g. an inverse Fourier conversion. The resulting vector signal, which has a course which monotonously decays from an initial high value followed by a rise to a second relative maximum, is gated so that only the portion thereof prior to the rise which portion represents the basic noise characteristic of the object, is passed to a device for comparing this signal with stored signals representing the basic noise characteristic of known objects.

REFERENCES:
patent: 3147467 (1964-09-01), Laakman
patent: 3471846 (1969-07-01), Cotler et al.
patent: 3553723 (1971-01-01), Ohrsborg

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