應用於不同姿態與量測位置心率偵測濾波器實作之評估

Evaluation of Filter Implementation for Heart Rate Detection in Different Postures and Measured Positions

蕭奕昕(Yi-Hsin Hsiao)

指導教授 ： 李仁貴

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00311

摘要

心率信號對人體健康提供可靠指標，也能足以事先預防使用者過勞或運動過度之情況。現今許多測量心率產品因肌電訊號、電氣干擾、時基飄移、電信號擾動及體積因素，無法動態中以可攜形式使用，或僅能靜態量測。本文提出一套流程，研究濾波器特性，並針對濾波器特性進行比較，選擇較適於不同姿態中擷取心率之濾波器種類；探討濾波器階數及抑制效果的關聯；以數位濾波方式確定監測頻帶；參考先前研究論文所提出各種姿態，並再增加更多姿態以供評估；以電極貼片於量測部位貼牢，確保電極不會滑動，避免量測失真；擷取心率信號，將濾波器與心率擷取電路結合，觀察不同濾波器階數、不同姿態、不同量測部位下避免訊號干擾之心率信號頻帶，濾除雜訊，探討在各姿態下心率辨識可行性。
本實驗由擷取心率的量測兩點間姿態幅度大小選擇較合適之濾波器階數，評估抗雜訊效果。得出心率擷取電路結合低階濾波器，於動態中性能不彰，雜訊較多；經高階濾波器後心率信號相對明顯，但電路大小須考量，而濾波器階數需求亦與量測部位相關；由量測部位分類，胸前心率信號較清晰，可用較低階濾波器擷取心率，頸部訊雜比較低，經高階濾波仍難以擷取心率信號。希望能提供偵測心率信號電路應用於可攜式量測產品時，所需濾波器特性之建議與參考。

關鍵字

心率信號 ； 濾波器 ； 肌電訊號 ； 姿態

並列摘要

Heart rate signal is one of the reliable reference for human healthy, and this signal is also enough to prevent out of fatigue and excessive exercise. There are lots of researches have been extended from heart rate signal, such as within electrodes in clothes, combined athletic postures in experiments, and electrodes effect on heart rate detection. It means the heart rate analysis is valuable for human.
Users can not measure heart rate signal by products in the markets because of the muscle noise from postures, electric interference and the volume of the products, they only works in static state.
There is a researching flow chart presented in this paper. In the first step, we capture the heart rate signal, investigate the feature of filters, then decide the filters which fit for capturing heart rate signal in other postures. There are some discussions about the orders of filters and the bandwidth which fit for heart rate detection. Then we combined these filters with heart rate detected circuit, and analysis the noise and the bandwidth by different postures and measured positions. Avoid these muscle noise and interference, and improve the heart rate signal recognition. It shows the performance is related by filter orders after this researching flow, but on the other hand, area of the filter circuit should be considered. The heart rate signal is clearer than other positions on the chest, and the signal which from neck cannot be evaluated; it means the signal-noise-ratio is worse than other measured position. People can choose the suitable filter size and orders of filters for these postures and evaluate the effect on anti-noise between two measured electrodes. This paper provide the evaluation about heart rate detection which measured in different postures and positions, and provide the characteristics for portable device designed in the future.

並列關鍵字

Heart rate ； filter ； muscle noise ； posture

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