Motion noise interference eliminating method suitable for wearable heart rate monitoring device

A noise interference, wearable technology, applied in the field of signal processing, can solve the problems of large volume, large amount of offline reference signal data, inconvenient to wear, etc., to reduce the amount of calculation and improve the effect of removal accuracy

Inactive Publication Date: 2014-11-26
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Although the Adaptive Step-size Least Mean Squares (AS-LMS) adaptive filter algorithm based on offline reference signals proposed by Ram M R et al. can achieve real-time denoising, the data volume of the selected offline reference signals is still large, which is difficult for Wearable devices require high computing power, which is difficult t

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  • Motion noise interference eliminating method suitable for wearable heart rate monitoring device
  • Motion noise interference eliminating method suitable for wearable heart rate monitoring device
  • Motion noise interference eliminating method suitable for wearable heart rate monitoring device

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[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] The structure of the wearable heart rate monitoring device based on the PPG signal in this example is as follows figure 1 shown. It is composed of data acquisition module, signal processing module, display module and communication module. The coordination and operation processing among multiple modules are controlled by the same microprocessor.

[0025] The data acquisition module consists of a near-infrared light-emitting tube, a light-receiving tube, a three-axis acceleration sensor and a gyroscope. The intensity and duration of the glow are controlled by a microprocessor. The three-ax...

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Abstract

The invention discloses a motion noise interference eliminating method suitable for a wearable heart rate monitoring device based on a photo plethyamo graphy. The method can effectively eliminate motion noise interference and improve heart rate value monitoring precision. According to the method, an NLMS self-adapting filter and a Mallat algorithm are combined, and six-axis acceleration signals generated by a triaxial accelerometer and a gyroscope are selected as motion reference signals of the self-adapting filter to eliminate part of motion noise interference. The method takes full consideration of complexity and calculation amount of the algorithm, the characteristic that motion noise and heart rate noise are equal in frequency, and other noises and the heart rate noise are not overlapped in frequency is utilized, and through two efficient and low-complexity algorithms, different noises are eliminated step by step, and the purpose of calculating the heart rate in real time is achieved. The low complexity of the method guarantees practicability of the method on the wearable heart rate monitoring device.

Description

technical field [0001] The invention relates to the field of signal processing, and is a method for removing motion and noise interference, which combines a normalized least mean difference (NLMS) adaptive filter and a Mallat algorithm, and is suitable for wearable devices based on photoplethysmography Type heart rate monitoring equipment, which can effectively eliminate motion and noise interference, and improve the accuracy of heart rate monitoring values. Background technique [0002] Heart rate refers to the number of times the human heart beats per minute. In the detection of human body parameters, heart rate is a very important physiological indicator, which provides a reference for medical diagnosis. At the same time, heart rate can also be used as an objective evaluation index of the physiological load of human exercise, and has been widely used in various aspects of fitness exercises and competitive sports training. At present, heart rate monitors still have many ...

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Application Information

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IPC IPC(8): A61B5/024G06F19/00
Inventor 孙咏梅张泓卢奕杉兰军健纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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