METHOD AND APPARATUS FOR DETERMINING SLEEP STATES
First Claim
1. A method of determining sleep states from an EEG signal of a subject, the method comprising the steps of:
- electronically processing the EEG signal to generate a spectrum of third or higher order of said signal;
electronically processing said spectrum to produce at least one spectrum time series for a predetermined frequency; and
electronically processing said spectrum time series for compliance with predetermined criteria to tangibly classify segments of the EEG signal as corresponding to particular macro-sleep states of the subject.
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Abstract
An apparatus is provided for detecting Macro Sleep Architecture states of a subject such as WAKE, NREM and REM sleep from a subject'"'"'s EEG. The apparatus includes an EEG digital signal assembly of modules arranged to convert analogue EEG signals into digital EEG signals. A bispectrum assembly is responsive to the EEG digital signal assembly and converts the digital EEG signals into signals representing corresponding bispectrum values. A bispectrum time series assembly, in electrical communication with an output side of the bispectrum assembly, generates at least one bispectrum time series for a predetermined frequency. A macro-sleep architecture (MSA) assembly is responsive to the bispectrum time series assembly and is arranged to produce classification signals indicating classification of segments of the EEG signals into macro-sleep states of the subject.
31 Citations
31 Claims
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1. A method of determining sleep states from an EEG signal of a subject, the method comprising the steps of:
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electronically processing the EEG signal to generate a spectrum of third or higher order of said signal; electronically processing said spectrum to produce at least one spectrum time series for a predetermined frequency; and electronically processing said spectrum time series for compliance with predetermined criteria to tangibly classify segments of the EEG signal as corresponding to particular macro-sleep states of the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 31)
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20. According to a further aspect of the present invention there is provided an apparatus for detecting sleep states of a subject including:
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an EEG digital signal assembly of modules arranged to convert analogue EEG signals into digital EEG signals; a spectrum assembly responsive to the EEG digital signal assembly and arranged to convert the digital EEG signals into signals representing spectrum values; a spectrum time series assembly in electrical communication with an output side of the spectrum assembly and arranged to generate at least one spectrum time series for a predetermined frequency; and a macro-sleep architecture (MSA) assembly responsive to the spectrum time series assembly and arranged to produce classification signals indicating classification of segments of the EEG signals into macro-sleep states of the subject. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification