Systems and methods for variable filter adjustment by heart rate metric feedback
First Claim
1. A physiological signal processing system comprising:
- a physiological sensor that is configured to generate a physiological waveform that includes cardiovascular and pulmonary signal components therein;
a variable high pass filter and a variable low pass filter that are responsive to the physiological waveform and that are configured to high pass and low pass filter, respectively, the physiological waveform in response to at least one corner frequency that is applied thereto;
a heart rate metric extractor that is coupled to an output of the variable high pass filter and is responsive to the variable high pass filter and that is configured to extract a heart rate metric from the cardiovascular signal component of the physiological waveform that is output from the variable high pass filter responsive to high pass filtering the physiological waveform;
a respiration rate metric extractor that is coupled to an output of and is responsive to the variable low pass filter and that is configured to extract a respiration rate metric from the pulmonary signal component of the physiological waveform that is output from the variable low pass filter responsive to low pass filtering the physiological waveform; and
a corner frequency adjustor that is responsive to the heart rate metric extractor and that is configured to determine the at least one corner frequency that is applied to the variable high pass filter and the variable low pass filter from the heart rate metric that was extracted based on the output from the variable high pass filter.
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Abstract
A physiological signal processing system for a physiological waveform that includes a cardiovascular signal component provides a variable high pass filter that is responsive to the physiological waveform, and that is configured to high pass filter the physiological waveform in response to a corner frequency that is applied. A heart rate metric extractor is responsive to the variable high pass filter and is configured to extract a heart rate metric from the physiological waveform that is high pass filtered. A corner frequency adjuster is responsive to the heart rate metric extractor and is configured to determine the corner frequency that is applied to the variable high pass filter, based on the heart rate metric that was extracted. Analogous methods may also be provided.
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Citations
21 Claims
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1. A physiological signal processing system comprising:
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a physiological sensor that is configured to generate a physiological waveform that includes cardiovascular and pulmonary signal components therein; a variable high pass filter and a variable low pass filter that are responsive to the physiological waveform and that are configured to high pass and low pass filter, respectively, the physiological waveform in response to at least one corner frequency that is applied thereto; a heart rate metric extractor that is coupled to an output of the variable high pass filter and is responsive to the variable high pass filter and that is configured to extract a heart rate metric from the cardiovascular signal component of the physiological waveform that is output from the variable high pass filter responsive to high pass filtering the physiological waveform; a respiration rate metric extractor that is coupled to an output of and is responsive to the variable low pass filter and that is configured to extract a respiration rate metric from the pulmonary signal component of the physiological waveform that is output from the variable low pass filter responsive to low pass filtering the physiological waveform; and a corner frequency adjustor that is responsive to the heart rate metric extractor and that is configured to determine the at least one corner frequency that is applied to the variable high pass filter and the variable low pass filter from the heart rate metric that was extracted based on the output from the variable high pass filter.
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2. A physiological signal processing system for a physiological waveform that includes a cardiovascular signal component therein, the physiological signal processing system comprising:
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a variable high pass filter that is responsive to the physiological waveform and that is configured to high pass filter the physiological waveform in response to a corner frequency that is applied thereto; a heart rate metric extractor that is coupled to an output of the variable high pass filter and is responsive to the variable high pass filter and that is configured to extract a heart rate metric from the cardiovascular signal component of the physiological waveform that is output from the variable high pass filter responsive to high pass filtering the physiological waveform; and a corner frequency adjustor that is responsive to the heart rate metric extractor and that is configured to determine the corner frequency that is applied to the variable high pass filter from the heart rate metric that was extracted based on the output from the variable high pass filter. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A physiological signal processing method for a physiological waveform that includes a cardiovascular signal component therein, the physiological signal processing method comprising:
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high pass filtering the physiological waveform in response to an adjustable high pass filter corner frequency; extracting a heart rate metric from the cardiovascular signal component of the physiological waveform that is output from the high pass filtering; and determining the adjustable high pass filter corner frequency that is applied to the high pass filtering, from the heart rate metric that was extracted based on the output from the high pass filtering. - View Dependent Claims (19, 20, 21)
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Specification