US4782456A
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System for detecting the presence of a pure signal in a discrete noisy signal measured at a constant average noise level with a probability of false detection below a predetermined false detection level
Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1986-04-23
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Granted: 1988-11-01
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Expires: 2006-04-23
Abstract
Abstract A system for detecting the presence of a pure signal in a discrete noisy signal measured at a constant average noise level M, having a processor for measuring a counting rate N and for calculating a false detection probability PF as a function of the counting rate and an estimated average noise level M, and for comparing the probability with a predetermined false detection level TF. A pure signal is detectd when the probability is below the false detection level.
Inventors
- 👤 Emile Poussier
- 👤 Michel Rambaut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:50
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A system for detecting the presence of a pure signal in a discrete noisy signal measured at a constant average noise level, comprising: in series a converter for converting radiation received thereby into electrical pulses, a shaping means, a binary counting scale, a processing means, and a signalling means; said processing means comprising a processor, at least one memory, and an input-output circuit, said processor comprising means for measuring a counting rate N during successive equal time periods, means for estimating a value of an average noise level M, means for calculating a false detection probability PF as a function of said counting rate N and of the estimated average noise level M, and means for comparing said false detection probability PF with a predetermined false detection level TF, to thereby ascertain that a pure signal has been detected when said false detection probability PF is below said false detection level.
Claim 2
Independent Claim
151 words
A system for detecting the presence of a pure signal in a discrete noisy signal measured at a constant average noise level, comprising: in series a converter for converting radiation received thereby into electrical pulses, a shaping means, a binary counting scale, a processing means, and a signalling means; said processing means comprising a processor, at least one memory, and an input-output circuit, said processor comprising means for measuring a counting rate N during successive equal time periods, means for estimating a value of an average noise level M, means for calculating a false detection probability PF as a function of said counting rate N and of the estimated average noise level M, and means for comparing said false detection probability PF with a predetermined false detection level TF, to thereby ascertain that a pure signal has been detected when said false detection probability PF is below said false detection level.
Claim 3
Dependent Claim
114 words
A system according to to claim 1, wherein the memory comprises a sequence of cells and contains a table for one value of the predetermined false detection level TF, a cell of subscript I containing a value M I , such that the false detection probability for said average noise level M I and a counting rate I is equal to the false detection level, the processor comprising means for comparing, following each measurement, a value M N contained at subscript N of the table, in which N is the measured counting rate, with the estimated average noise level M, to thereby ascertain that a pure signal has been detected when M N ≧M.
Claim 4
Dependent Claim
36 words
A system according to claim 2, wherein the processor comprises means for evaluating the average noise level M for a mean value of k count rates preceding a final measurement, in which k is an integer.
Claim 5
Dependent Claim
139 words
A system according to claim 1, wherein the memory comprises a sequence of cells and contains a table for one value of the predetermined false detection level TF, a cell of subscript I containing an integral value T equal to the closest integer to kM I , in which k is a given integer and M I the average noise level such that the false detection probability for said average noise level and a counting rate I is equal to the false detection level, the processor comprising means for comparing, following each measurement, a value T N contained at subscript N of the table, in which N is the measured counting rate at the integer T closest to kM, with the known average noise level, to thereby ascertain that a pure signal has been detected when T N ≧T.
Claim 6
Dependent Claim
66 words
A system according to claim 4, wherein the processor comprises means for evaluating the average noise level M by the mean value of k count rates preceding a final measurement, in which k is an integer and wherein the integer T, compared with a value T N of the table, is equal to the sum of the k counting rates preceding the final counting rate N.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |