Method and apparatus for storing signals in an implantable medical device
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United States of America Patent
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Nov 17, 1998
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app pub date -
Mar 3, 1997
filing date -
Mar 4, 1996
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Abstract
A method of storing signals having a course over time in an implantable medical device, and/or transmitting the signals out of the device and out of the patient's body, with the course over time being detected in the device, particularly at predetermined time intervals with a constant sampling interval, and a sequence of signal samples being obtained therefrom, of which a partial quantity is stored and/or transmitted as the result of a selection made with a predetermined selection criterion, with the selection criterion being the first derivation of the course over time of the signals according to time, and with the selection being made such that the first derivation of the straight-line connection between an nth and the (n-1)th signal sample is determined and compared to the first derivation of the straight-line connection between the (n-1)th signal sample and the last-stored and/or last-transmitted signal sample, and the nth signal sample is then stored and/or transmitted as the new last signal sample exactly when these first derivations differ by more than a predetermined value.
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