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US5211178A
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Method and apparatus for synchronously detecting a magnetocardiogram and method and apparatus for synchronously adding magnetocardiograms
Assignee: Daikin Industries Ltd
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Filing: 1991-09-27
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Granted: 1993-05-18
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Expires: 2011-09-27
Abstract
Abstract Cross-correlation values representative of cross-correlation of an electrocardiogram pulse with a rectangular pulse window which consists of a negative rectangular pulse, a positive rectangular pulse and a negative rectangular pulse are obtained. An R-wave of the electrocardiogram is detected by a peak of the cross-correlation values is detected. Then a magnetocardiogram in synchronism with the R-wave of the electrocardiogram is detected. Magnetocardiograms corresponding to individual cycles of a magnetocardiogram can be added as required.
Inventors
- 👤 Hisashi Kado
- 👤 Tomoaki Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:31
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/24; A61B5/242; A61B5/243; A61B5/316; A61B5/318; A61B5/346; A61B5/349; A61B5/352
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
94 words
A method for synchronously detecting a magnetocardiogram comprising the steps of: receiving an electrocardiogram signal; receiving a magnetocardiogram signal; determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order; cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal; detecting Q-R-S groups of the electrocardiogram signal based on the obtained cross-correlation values signal; and detecting a portion of the magnetocardiogram signal which is in synchronism with the detected Q-R-S groups.
Claim 2
Independent Claim
94 words
A method for synchronously detecting a magnetocardiogram comprising the steps of: receiving an electrocardiogram signal; receiving a magnetocardiogram signal; determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order; cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal; detecting Q-R-S groups of the electrocardiogram signal based on the obtained cross-correlation values signal; and detecting a portion of the magnetocardiogram signal which is in synchronism with the detected Q-R-S groups.
Claim 3
Independent Claim
85 words
A method for synchronously adding magnetocardiograms comprising the steps of: receiving a electrocardiogram signal; receiving magnetocardiogram signals; determining a rectangular pulse window signal which consists of a negative rectangular pulse, a positive rectangular pulse and a negative rectangular pulse, in this order; cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal; detecting Q-R-S groups of the electrocardiogram based on the obtained cross-correlation values signal; and adding magnetocardiogram cycle portions which are in synchronism with the detected Q-R-S groups.
Claim 4
Independent Claim
85 words
A method for synchronously adding magnetocardiograms comprising the steps of: receiving a electrocardiogram signal; receiving magnetocardiogram signals; determining a rectangular pulse window signal which consists of a negative rectangular pulse, a positive rectangular pulse and a negative rectangular pulse, in this order; cross-correlating the electrocardiogram signal with the rectangular pulse window signal to obtain a cross-correlation values signal; detecting Q-R-S groups of the electrocardiogram based on the obtained cross-correlation values signal; and adding magnetocardiogram cycle portions which are in synchronism with the detected Q-R-S groups.
Claim 5
Dependent Claim
42 words
A method for synchronously adding magnetocardiograms as set forth in claim 2, wherein a time width ratio of the negative rectangular pulse wave, the positive rectangular pulse wave, and the negative rectangular pulse wave of the rectangular pulse window signal is 1:2:1.
Claim 6
Dependent Claim
44 words
A method for synchronously adding magnetocardiograms as set forth in claim 2, wherein the amplitudes of the negative rectangular pulse waves of the rectangular pulse window are "-1" and the amplitude of the positive rectangular pulse wave of the rectangular pulse window is "1".
Claim 7
Independent Claim
97 words
An apparatus for synchronously detecting a magnetocardiogram comprising: means for receiving an electrocardiogram signal; means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order; cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal; R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal; and magnetocardiogram detection means for detecting a magnetocardiogram signal in synchronism with detecting R-waves.
Claim 8
Independent Claim
97 words
An apparatus for synchronously detecting a magnetocardiogram comprising: means for receiving an electrocardiogram signal; means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave, in this order; cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal; R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal; and magnetocardiogram detection means for detecting a magnetocardiogram signal in synchronism with detecting R-waves.
Claim 9
Independent Claim
108 words
An apparatus for synchronously adding magnetocardiograms comprising: means for receiving an electrocardiogram signal; means for receiving magnetocardiogram signals; means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave in this order; cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal; R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal; and addition means for adding received magnetocardiogram signals corresponding to individual cycles of a magnetocardiogram signal in synchronism with detected R-waves.
Claim 10
Independent Claim
108 words
An apparatus for synchronously adding magnetocardiograms comprising: means for receiving an electrocardiogram signal; means for receiving magnetocardiogram signals; means for determining a rectangular pulse window signal which consists of a negative rectangular pulse wave, a positive rectangular pulse wave and a negative rectangular pulse wave in this order; cross-correlation means for cross-correlating a received electrocardiogram signal with a determined rectangular pulse wave signal to obtain a cross-correlation values signal; R-wave detection means for detecting R-waves of a received electrocardiogram signal based on an obtained cross-correlation values signal; and addition means for adding received magnetocardiogram signals corresponding to individual cycles of a magnetocardiogram signal in synchronism with detected R-waves.
Claim 11
Dependent Claim
42 words
An apparatus for synchronously adding magnetocardiograms as set forth in claim 6, wherein a time width ratio of the negative rectangular pulse wave, the positive rectangular pulse wave and the negative rectangular pulse wave of said rectangular pulse window signals is 1:2:1.
Claim 12
Dependent Claim
43 words
An apparatus for synchronously adding magnetocardiograms as set forth in claim 6, wherein amplitudes of the negative rectangular pulse waves of the rectangular pulse window are "-1" and an amplitude of the positive rectangular pulse wave of the rectangular pulse window is "1".
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-05-17 | 1996-11-16 | 1997-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-17 | 2000-11-16 | 2001-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-17 | 2004-11-16 | 2005-05-18 | $7700.00 | Window Closed / Lapsed |