Physiological event detection
First Claim
1. A physiological event detector comprising:
- a delta converter to convert an analog physiological signal to a digital delta value representative of a slope of the analog physiological signal;
a correlator to correlate the digital delta value with a correlation template; and
an event detector to detect a physiological event based on an output of the correlation circuit.
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Abstract
In general, the invention is directed to techniques for electrically detecting physiological events. The physiological events may include cardiac events such as R waves or p waves. In addition, the physiological events may include respiratory events. In general, the techniques involve converting an analog physiological signal to a digital delta value, correlating the digital delta value with a correlation template, and detecting a physiological event based on an output of the correlation. A digital correlation-based technique, as described herein, is implemented to reliably detecting physiological events, particularly for very small signals captured in the presence of significant background noise.
85 Citations
45 Claims
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1. A physiological event detector comprising:
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a delta converter to convert an analog physiological signal to a digital delta value representative of a slope of the analog physiological signal; a correlator to correlate the digital delta value with a correlation template; and an event detector to detect a physiological event based on an output of the correlation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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converting an analog physiological signal to a digital delta value representative of a slope of the analog physiological signal; correlating the digital delta value with a correlation template; and detecting a physiological event based on an output of the correlation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A physiological event detector comprising:
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means for converting an analog physiological signal to a digital delta value representative of a slope of the analog physiological signal; means for correlating the digital delta value with a correlation template; and means for detecting a physiological event based on an output of the correlation. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification