Motion Cancellation of Optical Input Signals for Physiological Pulse Measurement
First Claim
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1. A pulse rate sensor for measuring a physiological parameter of an individual comprising:
- an emitter for transmitting a light source into body tissue;
a photo detector for receiving reflected light from said body tissue and producing a photo detector output signal indicative of reflected light;
an accelerometer for measuring regular motion of the individual and producing an accelerometer output signal indicative of the regular motion;
a contact type motion sensor for measuring erratic motion of the user and producing a contact type motion sensor output signal indicative of the erratic motion; and
a microprocessor for receiving the photo detector output signal, the accelerometer output signal, and the contact type motion sensor output signal, and determining the pulse rate of the individual, wherein the pulse rate is determined by conditioning the photo detector output signal and removing portions of the conditioned photo detector output caused by regular motion and erratic motion of the individual, wherein the conditioning comprises amplifying the photo detector output signal and applying a direct current compensation to the photo detector output signal.
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Abstract
A pulse rate sensor that includes an accelerometer for measuring periodic motion and a piezo sensor for detecting erratic motion is capable of more accurately determining pulse rate by accounting for these types of motion. The pulse rate sensor in accordance with the present invention diminishes pulse rate signal degradation due to erratic motion through a combination of algorithms that control signal boosting, waveform refinement and signal noise suppression.
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Citations
20 Claims
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1. A pulse rate sensor for measuring a physiological parameter of an individual comprising:
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an emitter for transmitting a light source into body tissue; a photo detector for receiving reflected light from said body tissue and producing a photo detector output signal indicative of reflected light; an accelerometer for measuring regular motion of the individual and producing an accelerometer output signal indicative of the regular motion; a contact type motion sensor for measuring erratic motion of the user and producing a contact type motion sensor output signal indicative of the erratic motion; and a microprocessor for receiving the photo detector output signal, the accelerometer output signal, and the contact type motion sensor output signal, and determining the pulse rate of the individual, wherein the pulse rate is determined by conditioning the photo detector output signal and removing portions of the conditioned photo detector output caused by regular motion and erratic motion of the individual, wherein the conditioning comprises amplifying the photo detector output signal and applying a direct current compensation to the photo detector output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring a user pulse rate during physical exercise or activity, said method comprising:
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transmitting a light source into body tissue; receiving reflected light from said body tissue with a photo detector to produce a pulse signal, the reflected light indicative of overall vascular activity of the user; amplifying the pulse signal and applying a direct current compensation to the pulse signal; measuring regular motion of the user; measuring erratic motion of the user; and by use of a microprocessor, calculating pulse rate of said user based upon the received reflected light by eliminating portions caused by the measured regular motion of the user and the erratic motion of the user. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A pulse rate sensor for measuring the pulse rate of an individual, comprising:
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a light emitter for transmitting light into body tissue, the intensity of the light emitter being dependent upon an intensity control signal; a photo detector for receiving reflected light from said body tissue and producing a photo detector output signal indicative of reflected light; an accelerometer for measuring regular motion of the individual and producing an accelerometer output signal indicative of the regular motion; a contact type motion sensor for measuring erratic motion of the user and producing a contact type motion sensor output signal indicative of the erratic motion; a first amplifier for receiving the photo detector output and a reference input, the first amplifier having a first amplified output which provides an adjusted first amplified signal; a second amplifier for receiving the adjusted first amplified signal, a dc adjustment signal, and a variable gain adjustment signal, the second amplifier producing a second amplifier output signal which is dc adjusted based on the dc adjustment signal and which is amplified based on the variable gain adjustment signal; and a microprocessor for receiving the photo detector output signal, the accelerometer output signal, the piezo sensor output signal, the adjusted first amplified signal and the second amplifier output signal, the microprocessor for producing the intensity control signal to provide an appropriate emitter intensity, for producing the de adjustment signal to provide appropriate adjustment of the second amplifier, for producing the variable gain signal to provide appropriate gain for the second amplifier, and for determining the pulse rate of the individual, wherein the pulse rate is determined by monitoring the photo detector output signal the first amplifier output signal, and the second amplifier output signal and removing portions of those signals caused by regular motion and erratic motion of the individual. - View Dependent Claims (19, 20)
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Specification