METHOD AND APPARATUS FOR ROBUST HEART RATE SENSING
First Claim
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1. A heart rate sensing system comprising:
- a primary sensor for sensing a physiological phenomenon that is correlated with beating of an organism'"'"'s heart and producing a first signal therefrom;
a pressure sensor for sensing a fluctuating pressure signal that is correlated with a noise signal component that is also sensed by the primary sensor;
an adaptive noise canceller coupled to the primary sensor and the pressure sensor wherein said adaptive noise canceller is adapted to reduce the noise signal component in said first signal and output a reduced noise output signal.
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Abstract
A heart rate sensing system (300) includes a light source (112, 310, 1008, 1110) a light detector (114, 1010, 1112) and a pressure sensor (116, 1012, 1114) held by a compressible comformable resilient pad (110, 1006, 1108) against a wearers body (202). A signal from the pressure sensor is used to alter the amplitude of a signal detected by the light source in order to reduce motion artifacts. The system can be incorporated into an article, such as an ear cuff (100), an audio headset (1000) or a set of headphones (1100), that is suitable for use by an active user.
82 Citations
34 Claims
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1. A heart rate sensing system comprising:
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a primary sensor for sensing a physiological phenomenon that is correlated with beating of an organism'"'"'s heart and producing a first signal therefrom; a pressure sensor for sensing a fluctuating pressure signal that is correlated with a noise signal component that is also sensed by the primary sensor; an adaptive noise canceller coupled to the primary sensor and the pressure sensor wherein said adaptive noise canceller is adapted to reduce the noise signal component in said first signal and output a reduced noise output signal. - View Dependent Claims (2, 3)
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4. A heart rate sensing system comprising;
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a primary sensor for sensing a physiological phenomenon that is correlated with beating of an organism'"'"'s heart and producing a signal; a first peak detector coupled to said primary sensor; a counter coupled to, at least, said first peak detector wherein said counter is adapted to count a first count of peaks detected by said first peak detector within each of a first series of windows; a buffer coupled to said counter for receiving peak counts from said counter, wherein said buffer is adapted to store a plurality of counts at any given instant; a processing circuit coupled to said buffer wherein said processing circuit is adapted to process said plurality of counts stored in said buffer and produce a heart rate estimate there from. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A heart rate sensing system comprising:
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an optical detection subsystem comprising an optical source for illuminating a body part with optical radiation, and an optical sensor for detecting said optical radiation after said optical radiation has been modulated by a physiological phenomenon occurring in said body part that is correlated with a heart beat, wherein said optical sensor produces a first signal; a secondary sensor for sensing a second signal that is correlated with a noise component of said first signal, wherein said second signal is coupled into said optical detection subsystem in such manner as to effect an amplitude of said first signal. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A heart rate sensing apparatus comprising:
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a body of compressible material have a surface adapted to be placed against a body part; a optical radiation source mounted on said body of compressible material; and an optical radiation sensor mounted on said body of compressible material. - View Dependent Claims (23, 24, 25, 26)
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27. A sensing system comprising;
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a sensor for sensing a phenomenon and producing a signal; a buffer coupled to said sensor wherein said buffer receives a sequence of values derived from said signal and wherein said buffer is adapted to store a plurality of values at any given instant; a windowed averager coupled to said buffer wherein said windowed averager is adapted to compute at least two different averages of said values stored in said buffer wherein said two different averages are taken over two distinct sets of values stored in said buffer; a state machine coupled to said buffer wherein said state machine is adapted to receive said at least two different averages and process said at least two different averages and produce a signal estimate there from. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification