Method and apparatus for monitoring the respiration activity of a subject
AssigneeKoninklijke Philips Electronics N.V.
InventorJens Muehlsteff
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Abstract
The invention relates to a method for monitoring the respiration activity of a subject, comprising the acquisition of a sensor signal of at least one Doppler-Radar sensor representing the respiration activity of a subject, the transformation of the sensor signal into a transformation signal being a series according to Formula (I) where ak is a set of predetermined constant coefficients specific for one individual subject, and processing the transformation signal S(t). The transformation signal can be analysed with basic signal processing techniques that are applied in the field of inductive plethysmography. The invention is further related to a corresponding monitoring system.
Claims12
A method for monitoring the respiration activity of a subject, comprising:
- acquiring a sensor signal D(t) of at least one Doppler-Radar sensor representing the respiration activity of a subject,
- characterized by
- transforming the sensor signal D(t) into a transformation signal S(t), S(t) being a series according to
- S
-
- (
- t
- )
- =
- ∑
- k
- =
- 0
- m
-
- a
- k
-
- D
-
- (
- t
- )
- k
- ,
- where ak is a set of predetermined constant coefficients,
- and processing the transformation signal S(t).
System (10;
- 30) for monitoring the respiration activity of a subject (32), comprising:
- at least one Doppler-Radar sensor (18) provided to acquire a sensor signal D(t) representing the respiration activity of a subject (32),
- characterized by a signal transformation unit (20) provided for transforming the sensor signal D(t) into a transformation signal S(t), S(t) being a series according to
- S
-
- (
- t
- )
- =
- ∑
- k
- =
- 0
- m
-
- a
- k
-
- D
-
- (
- t
- )
- k
- ,
- where ak is a set of predetermined constant coefficients,
- a storage unit (22) for storing sets ak of predetermined constant coefficients,
- and a processing unit (24) for processing the transformation signal S(t).
Dependencies are inferred from the claim text.