Apparatus for determining sleep staging
OwnerWilfried Dimpfelinventor
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Abstract
Small bandwidth frequency ranges are disclosed for frequency transformation and processing of EEG signals for determining sleeping staging with a sleep staging index (S.sub.F) in which a frequency transformation of a time domain EEG signal from an EEG measuring device is supplied in a plurality of sub-band frequency ranges a, b, and c. Processing of the frequency domain transformed data is performed which ascertains values A, B, and C representative of the frequency range a from 4.75 to 6.75 Hz, the frequency range b from 12.75 to 18.5 Hz, and the frequency range c from 18.75 to 35.0 Hz or representative of least two of said frequency ranges and determines therefrom a sleep staging index S.sub.F.
Claims5
An apparatus for determining sleep staging comprising:
- a transformation means to which an output signal (EEG(t)) of an EEG measuring device is supplied and which transforms the supplied EEG signal into a frequency range comprising a plurality of sub-bands including frequency ranges a, b, and c;
- and
- a processing means to which the EEG signal (EEG(f)) transformed into the frequency range is supplied from said transformation means and which ascertains values A, B and C representative of the frequency range a from 4.75 to 6.75 Hz, the frequency range b from 12.75 to 18.5 Hz and the frequency range c from 18.75 to 35.0 Hz or representative of least two of said frequency ranges and determines therefrom a sleep staging index S.sub.F.
Dependencies are inferred from the claim text.