An Enhanced Step Detection Algorithm with Threshold Function under Low Sampling Rate


KIPS Transactions on Computer and Communication Systems, Vol. 4, No. 2, pp. 57-64, Feb. 2015
10.3745/KTCCS.2015.4.2.57,   PDF Download:

Abstract

At the case of peak threshold algorithm, 3-axes data should sample step data over 20 Hz to get sufficient accuracy. But most of the digital sensors like 3-axes accelerometer have very low sampling rate caused by low data communication speed on limited SPI or I2C bandwidth of the low-cost MPU for ubiquitous devices. If the data transfer rate of the 3-axes accelerometer is getting slow, the sampling rate also slows down and it finally degrades the data accuracy. In this study, we proved there is a distinct functional relation between the sampling rate and threshold on the peak threshold step detection algorithm under the 20Hz frequency, and made a threshold function through the experiments. As a result of experiments, when we apply threshold value from the threshold function instead of fixed threshold value, the step detection error rate can be lessen about 1.2% or under. Therefore, we can suggest a peak threshold based new step detection algorithm with threshold function and it can enhance the accuracy of step detection and step count. This algorithm not only can be applied on a digital step counter design, but also can be adopted any other low-cost ubiquitous sensor devices subjected on low sampling rate.


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Cite this article
[IEEE Style]
B. Y. Kim and Y. S. Chang, "An Enhanced Step Detection Algorithm with Threshold Function under Low Sampling Rate," KIPS Transactions on Computer and Communication Systems, vol. 4, no. 2, pp. 57-64, 2015. DOI: 10.3745/KTCCS.2015.4.2.57.

[ACM Style]
Bo Yeon Kim and Yun Seok Chang. 2015. An Enhanced Step Detection Algorithm with Threshold Function under Low Sampling Rate. KIPS Transactions on Computer and Communication Systems, 4, 2, (2015), 57-64. DOI: 10.3745/KTCCS.2015.4.2.57.