RESPIRATION PROCESSOR
0 Assignments
0 Petitions
Accused Products
Abstract
Respiratory rate can be calculated from an acoustic input signal using time domain and frequency domain techniques. Confidence in the calculated respiratory rate can also be calculated using time domain and frequency domain techniques. Overall respiratory rate and confidence values can be obtained from the time and frequency domain calculations. The overall respiratory rate and confidence values can be output for presentation to a clinician.
-
Citations
41 Claims
-
1-20. -20. (canceled)
-
21. A system for monitoring respiration of a patient using a signal received from a physiological sensor coupled with the patient, the system comprising:
-
a signal filter configured to receive an acoustic signal from an acoustic sensor coupled to a patient and filter the acoustic signal to generate a filtered output signal; a high gain stage configured to generate a first amplified output signal from the filtered output signal by amplifying the filtered output signal with a first gain level; a low gain stage configured to generate a second amplified output signal from the filtered output signal by amplifying the filtered output signal with a second gain level lower than the first gain level; and one or more hardware processors configured to; responsive to a magnitude of the first amplified output signal, select one of the first amplified output signal and the second amplified output signal to be a selected signal for further processing, determine first respiratory rates from a first domain representation of the selected signal and second respiratory rates from a second domain representation of the selected signal, the first domain representation being different from the second domain representation, assign first confidence values to the first respiratory rates using one or more of (i) a calculation of a spectral density of energy in the first domain representation, (ii) a calculation of a harmonic energy in the first domain representation, (iii) a comparison of local maximums in the first domain representation and one or more magnitude thresholds, and (iv) a comparison of maximum frequency components in the first domain representation and one or more frequency thresholds, assign second confidence values to the second respiratory rates using the second domain representation, determine overall respiratory rates from the first respiratory rates and the second respiratory rates using the first confidence values and the second confidence values, and output at least some of the overall respiratory rates to a display for presentation on the display. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
-
-
35. A method for monitoring respiration of a patient using a signal received from a physiological sensor coupled with the patient, the method comprising:
-
detecting, using an acoustic sensor coupled to a patient, an acoustic signal; filtering, using a signal filter, the acoustic signal to generate a filtered output signal; generating, using first electronic circuitry, a first amplified output signal from the filtered output signal by amplifying the filtered output signal with a first gain level; generating, using second electronic circuitry, a second amplified output signal from the filtered output signal by amplifying the filtered output signal with a second gain level lower than the first gain level; selecting, using one or more hardware processors, one of the first amplified output signal and the second amplified output signal to be a selected signal for further processing; determining, using the one or more hardware processors, first respiratory rates from a time domain representation of the selected signal and second respiratory rates from a frequency domain representation of the selected signal, the first respiratory rates being determined from at least some of the same set of samples of the selected signal as the second respiratory rates; determining, using the one or more hardware processors, first confidence values for the first respiratory rates, the first confidence values being indicative of one or more features of local maximums in the time domain representation; determining, using the one or more hardware processors, second confidence values for the second respiratory rates using the frequency domain representation, the second confidence values being determined from at least some of the same set of samples of the selected signal as the first confidence values; determining, using the one or more hardware processors, overall respiratory rates from the first respiratory rates and the second respiratory rates using the first confidence values and the second confidence values; and displaying, on a display, at least some of the overall respiratory rates. - View Dependent Claims (36, 37, 38, 39, 40, 41)
-
Specification