Systems and methods for determining respiration information using phase locked loop
US9247896B2 · kind B2 · utility
7Cited by
102References
14Claims
0Family size
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Key dates
| Filing date | Jan 4, 2012 |
| Grant date | Feb 2, 2016 |
| Priority date | — |
| Expiry date | Feb 23, 2034 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/742
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A patient monitoring system may receive a physiological signal such as a photoplethysmograph (PPG) signal that exhibits frequency and amplitude modulation based on respiration. A phase locked loop may generate a frequency demodulated signal and an amplitude demodulated signal from the PPG signal. An autocorrelation sequence may be generated for each of the frequency demodulated signal and the amplitude demodulated signal. The autocorrelation sequences may be combined and respiration information may be determined based on the combined autocorrelation sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.