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Method and apparatus for analysis of essentially periodic signal sequences
| Details |
Inventors: Weigert, Kurt; Molz, Claudius;
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE)
Primary Examiner: Kamm; William E.
Assistant Examiner:
Attorney, Agent or Firm: Hill, Van Santen, Steadman, Chiara & Simpson
In automatic EKG-analysis, for example, the occurrence of signals, such as regular QRS-complex or also extrasystoles, is monitored in adjustable time intervals. However, it also happens that regular signal complexes in a signal sequence are lacking. In accordance with an exemplary embodiment, for the recognition and display of missing individual events in the essentially periodic signal sequence corresponding to the mean signal frequency, an adjustable measuring voltage, proportional to the signal period duration, is compared with the mean value formed from the measuring voltage summed up in the preceding signal period, whereby, upon exceeding the comparison voltage value, a count signal is triggered. In this manner, asystolias, or so-called "missed beats" of the EKG can be ascertained, while compensatory pauses after extrasystoles are eliminated. |
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DETAILED DESCRIPTION Accordingly, the object underlying the invention consists in disclosing a method and an apparatus with which the automatic analysis of essentially periodic signal sequences is improved.
In particular, for the EKG-analysis technology, the possibility is to be provided for recording sporadically occurring (or isolated) asystolias or the failure of individual beats independently of the mean heart rate (or frequency).
In accordance with the invention, the object is achieved in that, for the recognition and display of lacking individual events in the essentially periodic signal sequence corresponding to the mean heart rate (or frequency), an adjustable measuring voltage, proportional to the signal period duration, is compared with the mean value from the measuring voltage summed up in the preceding signal period, whereby, upon exceeding the comparison voltage value, a count pulse is released (or triggered).
Thus, in the method according to the invention, a concomitant comparison voltage value is defined by the preceding signal period.
The increasing time-proportional measuring voltage in the currently occurring signal period can then be so adjusted that a count pulse is triggered only upon exceeding an interval which surpasses the mean event interval by a specific multiplication factor.
In this way an asystolia or a "missed beat" can be directly displayed in the case of EKG-analysis.
In an advantageous embodiment, the measuring voltage, in addition, is further compared with an adjustable constant voltage, so that the count signal is generated even when a maximum specifiable (or predeterminable) time interval is exceeded.
This time interval preferably amounts to two seconds (2 s), since, in the case of an EKG, an RR-interval greater than two seconds (2 s) is to be interpreted as pathological in every instance.
In a further development of the invention, also such event pauses, which are brought about solely due to a prematurely occurring significant event, can be recognized by means of comparison of the measuring voltage with the mean value of the comparison voltage, which mean value has been correspondingly raised by the degree of prematureness
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