US5626145A
Expired / Lapsed
US
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Method and apparatus for extraction of low-frequency artifacts from brain waves for alertness detection
Assignee: Lockheed Martin Energy Systems Inc
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Filing: 1996-03-20
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Granted: 1997-05-06
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Expires: 2016-03-20
Abstract
Abstract Methods and apparatus automatically detect alertness in humans by monitoring and analyzing brain wave signals. Steps include: acquiring the brain wave (EEG or MEG) data from the subject, digitizing the data, separating artifact data from raw data, and comparing trends in f-data to alertness indicators, providing notification of inadequate alertness.
Inventors
- 👤 Ned E. Clapp
- 👤 Lee M. Hively
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/16; A61B5/18; A61B5/24; A61B5/242; A61B5/245; A61B5/316; A61B5/369; A61B5/372; A61B5/40; A61B5/4076; A61B5/4094
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
100 words
A method for automatically extracting low-frequency artifact data from brain wave data comprising the steps of: (a) utilizing a standard method selected from the group of methods consisting of electroencephalogram method and magnetoencephalogram method to provide at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; and (b) separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, by passing the e-data through a zero-phase filter means for providing an output of f-data, whereby the f-data may be further analyzed to detect alertness.
Claim 2
Independent Claim
100 words
A method for automatically extracting low-frequency artifact data from brain wave data comprising the steps of: (a) utilizing a standard method selected from the group of methods consisting of electroencephalogram method and magnetoencephalogram method to provide at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; and (b) separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, by passing the e-data through a zero-phase filter means for providing an output of f-data, whereby the f-data may be further analyzed to detect alertness.
Claim 3
Dependent Claim
19 words
The method as described in claim 1 wherein said zero-phase filter means comprises an integrated circuit chip zero-phase filter.
Claim 4
Dependent Claim
26 words
The method described in claim 2 wherein recursions are used with the f-data from the zero-phase filter means described in claim 2 to yield artifact data.
Claim 5
Dependent Claim
107 words
Apparatus for automatically extracting low-frequency artifact data from brain wave data comprising: (a) data provision means selected from the group of means consisting of electroencephalogram means and magnetoencephalogram means for providing at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; and (b) separation means for separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, said separation means comprising a zero-phase filter means for providing an output of f-data, said separation means communicably connected to said data provision means, whereby the f-data may be further analyzed to detect alertness.
Claim 6
Dependent Claim
107 words
Apparatus for automatically extracting low-frequency artifact data from brain wave data comprising: (a) data provision means selected from the group of means consisting of electroencephalogram means and magnetoencephalogram means for providing at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; and (b) separation means for separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, said separation means comprising a zero-phase filter means for providing an output of f-data, said separation means communicably connected to said data provision means, whereby the f-data may be further analyzed to detect alertness.
Claim 7
Dependent Claim
19 words
The apparatus as described in claim 4 wherein said zero-phase filter means comprises an integrated circuit chip zero-phase filter.
Claim 8
Dependent Claim
26 words
The apparatus described in claim 5 wherein recursions are used with the f-data from the zero-phase filter means described in claim 5 to yield artifact data.
Claim 9
Dependent Claim
57 words
A zero-phase filter for separating artifact brain wave data, called f-data, from raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data, said zero-phase filter comprising an integrated circuit chip zero-phase filter for separating artifact brain wave data from raw brain wave data while preventing phase distortions in the data.
Claim 10
Dependent Claim
57 words
A zero-phase filter for separating artifact brain wave data, called f-data, from raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data, said zero-phase filter comprising an integrated circuit chip zero-phase filter for separating artifact brain wave data from raw brain wave data while preventing phase distortions in the data.
Claim 11
Dependent Claim
30 words
The integrated circuit chip zero-phase filter described in claim 7 wherein recursions are used with the f-data from the zero-phase filter means described in claim 7 to yield artifact data.
Claim 12
Independent Claim
120 words
A method for automatically detecting a subject's state of alertness from the subject's brain wave data comprising the steps of: (A) utilizing a standard method selected from the group of methods consisting of electroencephalogram method and magnetoencephalogram method to provide at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (B) separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, by passing the e-data through a zero-phase filter means for providing an output of f-data; (C) analyzing the f-data to detect indications of fatigue or drowsiness, thereby detecting a lack of alertness; and (D) providing an indication of the lack of alertness.
Claim 13
Independent Claim
120 words
A method for automatically detecting a subject's state of alertness from the subject's brain wave data comprising the steps of: (A) utilizing a standard method selected from the group of methods consisting of electroencephalogram method and magnetoencephalogram method to provide at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (B) separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, by passing the e-data through a zero-phase filter means for providing an output of f-data; (C) analyzing the f-data to detect indications of fatigue or drowsiness, thereby detecting a lack of alertness; and (D) providing an indication of the lack of alertness.
Claim 14
Dependent Claim
19 words
The method as described in claim 9 wherein said zero-phase filter means comprises an integrated circuit chip zero-phase filter.
Claim 15
Dependent Claim
26 words
The method described in claim 10 wherein recursions are used with the f-data from the zero-phase filter means described in claim 10 to yield artifact data.
Claim 16
Dependent Claim
151 words
Apparatus for automatically detecting a subject's state of alertness from the subject's brain wave data comprising: (A) data provision means selected from the group of means consisting of electroencephalogram means and magnetoencelaphogram means for providing at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (B) separation means for separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, said separation means comprising a zero-phase filter means for providing an output of f-data, said separation means communicably connected to said data provision means; (C) analysis means for analyzing the f-data to detect indications of fatigue or drowsiness, thereby detecting a lack of alertness, said analysis means communicably connected to said separation means; and (D) indication means for providing an indication of the lack of alertness, said indicator means communicably connected to said analysis means.
Claim 17
Dependent Claim
151 words
Apparatus for automatically detecting a subject's state of alertness from the subject's brain wave data comprising: (A) data provision means selected from the group of means consisting of electroencephalogram means and magnetoencelaphogram means for providing at least one channel of raw brain wave data, called e-data, selected from the group consisting of electroencephalogram data and magnetoencephalogram data; (B) separation means for separating artifact data, called f-data, from the e-data while preventing phase distortions in the data, said separation means comprising a zero-phase filter means for providing an output of f-data, said separation means communicably connected to said data provision means; (C) analysis means for analyzing the f-data to detect indications of fatigue or drowsiness, thereby detecting a lack of alertness, said analysis means communicably connected to said separation means; and (D) indication means for providing an indication of the lack of alertness, said indicator means communicably connected to said analysis means.
Claim 18
Dependent Claim
19 words
The apparatus as described in claim 12 wherein said zero-phase filter means comprises an integrated circuit chip zero-phase filter.
Claim 19
Dependent Claim
26 words
The apparatus described in claim 13 wherein recursions are used with the f-data from the zero-phase filter means described in claim 13 to yield artifact data.
References Cited (Backward Citations)
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