Motion cancellation of optical input signals for physiological pulse measurement

A technology for outputting signals and motion, applied in the field of signal processing, can solve problems such as noise

Inactive Publication Date: 2007-09-19
PULSETRACER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although conventional signal processing techniques may be able to reduce "out-of-band" noise; in other words, no noise is found in the frequency range of interest, they are the greatest common Point is the challenge of motion noise issues

Method used

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  • Motion cancellation of optical input signals for physiological pulse measurement
  • Motion cancellation of optical input signals for physiological pulse measurement
  • Motion cancellation of optical input signals for physiological pulse measurement

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Embodiment Construction

[0027] Although the invention has been illustrated and described in terms of preferred embodiments, the device may be produced in many different configurations, forms and materials. Preferred embodiments of the present invention are depicted in the drawings and will be described in detail below, it being understood that this disclosure is to be considered as an illustration of the principles of the invention and a functional description as to its architecture and not intended to Limit the invention to this illustrated embodiment. Those skilled in the art will envision many other possible variations within the scope of the invention.

[0028] Figure 2A illustrates a pulse rate sensor 101 in accordance with the present invention. Radiator 102 (eg, LED, light emitting diode) transmits a light source in the near infrared (IR) region into body tissue and a photodetector, such as infrared reflective sensor 104, which receives reflected light from the tissue. The pulse rate sensor ...

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Abstract

A pulse rate sensor that includes an accelerometer(108) for measuring periodic motion and a piezo sensor(106) for detecting erratic motion is capable of more accurately determining pulse rate by accounting for these types of motion. The pulse rate sensor(101) 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.

Description

Field of Invention [0001] The present invention relates generally to the field of signal processing. More particularly, the present invention relates to pulse rate monitors capable of providing an accurate measurement display of a user's pulse rate during physical exercise or other activity. Background technique [0002] Accurate measurement of an active person's pulse rate at the wrist is complicated by artifacts created by body motion, for example, when the person is running or otherwise engaging in physical activity or exercise. Therefore, pulse rate monitors currently on the market utilize a chest strap worn near the heart in order to minimize the effects of motion produced by exercise. Artifacts created by body movement are detected by the pulse rate sensor as "noise" that masks the heart rate pulse signal being measured. In order to mitigate the effects of these artifacts, it is essential to filter out and delete most of the noise signals that appear in the pulse fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/024
Inventor 理查德·A·纳泽瑞恩洛瑞·E·拉克苏珊·S·阿尔费尼马克·J·宾娜登·W·E·埃文斯保罗·哈瑞斯迈克尔·W·格阿特兹
Owner PULSETRACER TECH
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