SYSTEMS AND METHODS FOR FILTERING AUTOCORRELATION PEAKS AND DETECTING HARMONICS
First Claim
1. A method comprising:
- receiving a photoplethysmograph (PPG) signal;
processing, with processing equipment, the PPG signal to generate at least one respiration information signal;
generating, with the processing equipment, an autocorrelation sequence based on the at least one respiration information signal;
determining, with the processing equipment, whether the autocorrelation sequence includes an undesired harmonic; and
calculating, with the processing equipment, respiration information based at least in part on the autocorrelation sequence when it is determined that the autocorrelation sequence does not include an undesired harmonic.
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Accused Products
Abstract
Systems and methods are provided for determining respiration information from physiological signals such as PPG signals. A physiological signal is processed to generate at least one respiration information signal and an autocorrelation sequence is generated based on the at least one respiration information signal. In some embodiments, a respiration peak is identified based on the autocorrelation sequence and a composite peak is generated based on the identified peak and at least one previous respiration peak. Respiration information is calculated based on the composite peak. In some embodiments, a determination is made whether the autocorrelation sequence includes an undesired harmonic. When the autocorrelation sequence includes an undesired harmonic, the autocorrelation sequence may not be used in the calculation of respiration information.
4 Citations
20 Claims
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1. A method comprising:
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receiving a photoplethysmograph (PPG) signal; processing, with processing equipment, the PPG signal to generate at least one respiration information signal; generating, with the processing equipment, an autocorrelation sequence based on the at least one respiration information signal; determining, with the processing equipment, whether the autocorrelation sequence includes an undesired harmonic; and calculating, with the processing equipment, respiration information based at least in part on the autocorrelation sequence when it is determined that the autocorrelation sequence does not include an undesired harmonic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18, 19)
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11. A system comprising:
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an input for receiving a photoplethysmograph (PPG) signal; and processing equipment configured for; receiving a photoplethysmograph (PPG) signal; processing the PPG signal to generate at least one respiration information signal; generating an autocorrelation sequence based on the at least one respiration information signal; determining whether the autocorrelation sequence includes an undesired harmonic; and calculating respiration information based at least in part on the autocorrelation sequence when it is determined that the autocorrelation sequence does not include an undesired harmonic. - View Dependent Claims (12, 13, 14, 15, 16, 17, 20)
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Specification