Sensor system and sensing method for use in assessment of circulatory volume
AssigneeKoninklijke Philips N.V.
InventorsShaoxiong SUN, Wouter Herman PEETERS, Rick BEZEMER, Xi LONG, Ronaldus Maria AARTS
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Abstract
In a sensor system (12), output signals of at least one PPG sensor (14) are processed to derive a modified pulse amplitude variation (PAV) value, being modified to take account of a baseline variation of the PPG sensor output signal. In particular, the modified PAV is derived through performing a modification step (42) in which either: a baseline variation of the PPG sensor output is derived and combined with a previously derived PAV, or, a PPG sensor output is first processed to perform baseline variation compensation, in advance of then deriving a PAV from the compensated signal.
Claims15
A sensor system, comprising:
- a PPG sensor;
- a controller configured to process output signals from the PPG sensor, the controller being adapted to generate a modified pulse amplitude variation value based on:
- deriving a baseline variation of the PPG sensor output signal;
- deriving a pulse amplitude variation value from the PPG sensor output signal;
- and
- performing a pre- or post-adjustment step by which modification is realized in the derived pulse amplitude variation value based on said baseline variation of the PPG sensor output signal, wherein the pre- or post-adjustment step comprises:
- applying baseline variation compensation to the PPG sensor output signal in advance of deriving the pulse amplitude variation value, the compensation being based on the derived baseline variation, and/or
- subsequent to deriving the pulse amplitude variation value, combining the derived baseline variation additively with the derived pulse amplitude variation value to thereby generate the modified pulse amplitude variation value.
A method of deriving a modified pulse amplitude variation, comprising:
- measuring a PPG signal;
- deriving a baseline variation of the PPG signal;
- deriving a pulse amplitude variation from the PPG signal;
- and
- performing a pre- or post-adjustment step by which a modification is realized in the derived pulse amplitude variation based on the baseline variation of the PPG signal, wherein the pre- or post-adjustment step comprises:
- applying baseline variation compensation to the PPG signal in advance of deriving the pulse amplitude variation, based on the derived baseline variation;
- and/or
- subsequent to deriving the pulse amplitude variation, combining the derived baseline variation additively with the derived pulse amplitude variation to thereby generate the modified pulse amplitude variation.
(canceled)
Dependencies are inferred from the claim text.