Systems and methods for variable filter adjustment by heart rate metric feedback

A physiological signal processing system, comprising:

• a variable low pass filter that is responsive to a physiological waveform and that is configured to low pass filter the physiological waveform in response to a corner frequency that is applied thereto;
• a respiration rate metric extractor that is coupled to an output of the variable low pass filter and is configured to extract a respiration rate metric from a pulmonary signal component of the physiological waveform that is output from the variable low pass filter responsive to low pass filtering the physiological waveform;
• a variable high pass filter that is responsive to the physiological waveform and that is configured to high pass filter the physiological waveform;
• a heart rate metric extractor that is coupled to an output of the variable high pass filter and is configured to extract a heart rate metric from a cardiovascular signal component of the physiological waveform that is high pass filtered;
• and
• a corner frequency adjustor coupled to an output of the heart rate metric extractor that is configured to determine the corner frequency that is applied to the variable low pass filter from the heart rate metric extracted by the heart rate metric extractor.

A physiological signal processing method for a physiological waveform that includes a cardiovascular signal component and a pulmonary signal component therein, the physiological signal processing method comprising:

• executing, by at least one processor, computer program instructions stored in a non-transitory computer readable medium to perform operations comprising:
• low pass filtering the physiological waveform in response to an adjustable low pass filter corner frequency;
• extracting a respiration rate metric from the pulmonary signal component of the physiological waveform that is output from the low pass filtering;
• and
• determining the adjustable low pass filter corner frequency that is applied to the low pass filtering from a heart rate metric that is extracted from the cardiovascular signal component of the physiological waveform that is high pass filtered by a variable high pass filter.