Patent US2536750A successfully refreshed from Google Patents.
US3725690A
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Apparatus for evaluating a signal
Assignee: Siemens AG
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Filing: 1970-12-11
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Granted: 1973-04-03
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Expires: 1990-12-11
Abstract
Abstract Apparatus to determine directly from a signal the frequency which represents the standard deviation in the output spectrum of the signal as well as the ratio between the standard deviation of the output spectrum of the derived signal and the above-mentioned standard deviation in the output spectrum of the original signal. The invention is particularly characterized in that the standard deviation or variance of the derived signal is divided by the standard deviation or variance of the original signal, and in that the standard deviation or variance of the twice derived signal is divided by the standard deviation or variance of the single derived signal, whereupon the quotient produced by this procedure is divided by the quotient (standard deviation frequency) produced by the first-mentioned procedure.
Inventors
- 👤 B Hjorth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/20; A; A61; A61B; A61B5/00; A61B5/24; A61B5/316; A61B5/369; A61B5/372; A61B5/72; A61B5/7235; A61B5/7239; G01; G01R; G01R23/00; A61B5/7253; A61B5/7257
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
287 words
An apparatus for determining directly from an electrical signal f (t), such as an EEG-signal, parameters giving a measure of the average amplitude, the corresponding average frequency and the average dispersion of the frequency-distribution about that frequency in the output-spectrum of said signal during a specific time interval T, said apparatus comprising a first differentiation member 1 for the differentiation of said electrical signal, a second differentiation member 2 for the differentiation of the output-signal of the first differentiation member 1, three squaring members 3, 4, 5, the first squaring member 3 for squaring said electrical signal, the second for squaring the output signal of tHe first differentiation member 1 and the third for squaring the output signal of the second differentiation member 2, a first, second and third integration members 6, 7, 8 for the integration of the output signals os the first, second and third squaring members 3, 4, 5 over said specific time interval T, a first dividing member 9 for the division of the output signals of the second and first integration members 7, 6, a second dividing member 10 for the division of the output signals of the third and second integration members 8, 7, a third dividing member 11 for the division of the output signals of the second and first dividing members 10, 9, a first square root member 12 for calculating the square root of the output signal of the first dividing member 9, a second square root member 13 for calculating the square root of the output signal of the third dividing member 11 and means 14, 15, 16 for indicating the output signals of the first integration member 6 and of each square root member 12, 13.
Claim 2
Independent Claim
287 words
An apparatus for determining directly from an electrical signal f (t), such as an EEG-signal, parameters giving a measure of the average amplitude, the corresponding average frequency and the average dispersion of the frequency-distribution about that frequency in the output-spectrum of said signal during a specific time interval T, said apparatus comprising a first differentiation member 1 for the differentiation of said electrical signal, a second differentiation member 2 for the differentiation of the output-signal of the first differentiation member 1, three squaring members 3, 4, 5, the first squaring member 3 for squaring said electrical signal, the second for squaring the output signal of tHe first differentiation member 1 and the third for squaring the output signal of the second differentiation member 2, a first, second and third integration members 6, 7, 8 for the integration of the output signals os the first, second and third squaring members 3, 4, 5 over said specific time interval T, a first dividing member 9 for the division of the output signals of the second and first integration members 7, 6, a second dividing member 10 for the division of the output signals of the third and second integration members 8, 7, a third dividing member 11 for the division of the output signals of the second and first dividing members 10, 9, a first square root member 12 for calculating the square root of the output signal of the first dividing member 9, a second square root member 13 for calculating the square root of the output signal of the third dividing member 11 and means 14, 15, 16 for indicating the output signals of the first integration member 6 and of each square root member 12, 13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |