Rejecting noise in a signal
AssigneeDrägerwerk AG & Co. KGaA
InventorChristopher J. Brouse
Life of this patent
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Abstract
Reducing noise in a signal is provided. A first filter includes a selectively definable passband for filtering a first signal used in determining at least one patient parameter. A characteristic analyzer detects a characteristic of a second signal and generates a variability measurement value using a series of data values within the second signal over a previously occurring window of time. A filter controller coupled to the characteristic analyzer uses the variability measurement value to define a characteristic of the passband for the first filter and selectively tunes the passband of the first filter according to the defined characteristic. Related apparatus, systems, techniques, and articles are also described.
Claims33
An apparatus that reduces noise in a signal comprising:
- a first filter having a selectively definable passband for filtering a first signal used in determining at least one patient parameter comprising a heart rate;
- a characteristic analyzer that detects a characteristic of a second signal and generates a heart rate variability measurement value using previous values of the detected characteristic of the second signal over a previously occurring window of time;
- a filter controller coupled to the characteristic analyzer that uses the heart rate variability measurement value to define a characteristic of the passband for the first filter and selectively tunes the passband of the first filter according to the defined characteristic;
- a parameter processor coupled to each of the characteristic analyzer and the first filter, the parameter processor uses the filtered first signal to determine the at least one patient parameter;
- and
- wherein the parameter processor further determines a signal quality index (SQI) by calculating a pulse rate variability (PRV) over a predetermined prior period and compares the pulse rate variability to the heart rate variability.
A method of reducing noise in a signal comprising:
- selectively defining a passband of a first filter for filtering a first signal used in determining at least one patient parameter comprising a heart rate;
- detecting, by a characteristic analyzer, a characteristic of a second signal;
- generating a heart rate variability measurement value using past values of the detected characteristic of the second signal over a previously occurring window of time;
- using, by a filter controller, the heart rate variability measurement value to define a characteristic of the passband for the first filter;
- selectively tuning the passband of the first filter according to the defined characteristic of the passband;
- and
- determining, by a parameter processor, a signal quality index (SQI) by calculating a pulse rate variability (PRV) over a predetermined prior period and comparing the pulse rate variability to the heart rate variability.
Dependencies are inferred from the claim text.