Signal filter method and apparatus
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United States of America Patent
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Jun 5, 1984
Grant Date -
N/A
app pub date -
Nov 24, 1980
filing date -
Nov 24, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A signal filter method and apparatus for removing portions of a signal indicative of erroneous data, an exemplary apparatus including means for receiving the signal, means for adjusting a threshold by increasing the threshold a first predetermined amount when the signal is in a predetermined relationship with the threshold and for decreasing the threshold a second predetermined amount when the signal is in a second predetermined relationship with the threshold, and means for comparing the signal with the adjusted threshold and for transmitting the signal if the signal bears a first predetermined relationship to the threshold. Disclosed herein are digital and analog implementations of the signal filter method and apparatus, particularly suited for use with catheter-type oximeter apparatus.
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