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The wavelet transform was applied to process the accelerometer signals derived from human walking. The accelerometer signals were first decomposed at different levels utilizing the multi-scale and multi-resolution characteristics of the discrete wavelet transform. After the determination of both the mother wavelet and the optimal decomposition level, human gait series can thus be extracted from the eigen scale of the accelerometer signal. Compared with the method that detects peak values directly from accelerometer signals by thresholding, the wavelet transform gives higher detection rate of peak values on the eigen scale of the accelerometer signals. Even when the accelerometer signals are exposed to serious noise, experimental results still demonstrate that the wavelet approach can guarantee the precision of the extracted gait series, which is of vital importance for the subsequent analyses. It can be concluded that wavelet transform is an effective tool for the extraction of gait rhythmicity. The wavelet transform will be helpful in identifying the characteristics of other physiological signals.
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Keywords:
- wavelet transform /
- gait series /
- peak detection /
- eigen scale
[1] ［1］Costa M, Peng C K, Goldberger A L, Jeffrey M H 2003 Physica A 330 53
[2] ［2］Yogev G, Giladi N, Peretz C, Springer S, Simon E S, Jeffrey M H 2005 Eur. J. Neurosci. 22 1248
[3] ［3］Ashkenazy Y, Jeffrey M H, Ivanov P C, Stanley H E 2002 Physica A 316 662
[4] ［4］Rossitza B, Nir G, Leor G, Chava P, Jeffrey M H 2006 Eur. J. Neurosci. 24 1815
[5] ［5］Jeffrey M H, Lowenthal J, Herman T, Gruendlinger L, Peretz C, Giladi N 2007 Eur. J. Neurosci. 26 2369
[6] ［6］Zhuang J J, Ning X B, Yang X D, Hou F Z, Huo C Y 2008 Chin. Phys. B 17 852
[7] ［7］Goldberger A L, Amaral L A N, Jeffrey M H, Ivanov P C, Peng C K, Stanley H E 2002 Proc. Nat. Acad. Sci. 99 2466
[8] ［8］Zhuang J J, Ning X B, Yang X, Hou F Z, Huo C Y 2008 J. Nanjing Univ. 44 57 (in Chinese) ［庄建军、宁新宝、杨希、侯凤贞、霍铖宇 2008 南京大学学报 44 57］
[9] ［9］Deng Y, Shi W K, Liu Q 2002 Acta Phys. Sin. 51 759 (in Chinese) ［邓勇、施文康、刘琪 2002 物理学报 51 759］
[10] ］You R Y, Chen Z 2005 Chin. Phys. B 14 2176
[11] ］Deng Y Q, Cao S Y, Yu J, Xu T, Wang Q Y, Zhang Z G 2008 Acta Phys. Sin. 57 7017 (in Chinese) ［邓玉强、曹士英、于靖、徐涛、王清月、张志刚 2008 物理学报 57 7017］
[12] ］Ren L, Chen X G, Liu C T 2009 Acta Phys. Sin. 58 2035 (in Chinese) ［任磊、陈祥光、刘春涛 2009 物理学报 58 2035］
[13] ］Zhao W S, He Y G 2009 Acta Phys. Sin. 58 843 (in Chinese) ［赵文山、何怡刚 2009 物理学报 58 843］
[14] ］ Sahambi J S, Tandon S N, Bhatt R K P 1997 IEEE Eng. Med. Biol. 16 77
[15] ］Daubechies I 1992 Ten Lectures on Wavelets (Philadelphia: Society for Industrial and Applied Mathematics) p194
[16] ］Mallat S 1998 A Wavelet Tour of Signal Processing (San Diego: Academic Press) p10
[17] ］Zhao L, Feng J, Zhai G J, Zhang L H 2005 Acta Phys. Sin. 54 943 (in Chinese) ［赵莉、冯稷、翟光杰、张利华 2005 物理学报 54 1943］
[18] ］Zhu H J, Qin S R, Peng L L 2002 Chin. J. Mech. Eng. 38 10 (in Chinese) ［朱洪俊、秦树人、彭丽玲 2002 机械工程学报 38 10］
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[1] ［1］Costa M, Peng C K, Goldberger A L, Jeffrey M H 2003 Physica A 330 53
[2] ［2］Yogev G, Giladi N, Peretz C, Springer S, Simon E S, Jeffrey M H 2005 Eur. J. Neurosci. 22 1248
[3] ［3］Ashkenazy Y, Jeffrey M H, Ivanov P C, Stanley H E 2002 Physica A 316 662
[4] ［4］Rossitza B, Nir G, Leor G, Chava P, Jeffrey M H 2006 Eur. J. Neurosci. 24 1815
[5] ［5］Jeffrey M H, Lowenthal J, Herman T, Gruendlinger L, Peretz C, Giladi N 2007 Eur. J. Neurosci. 26 2369
[6] ［6］Zhuang J J, Ning X B, Yang X D, Hou F Z, Huo C Y 2008 Chin. Phys. B 17 852
[7] ［7］Goldberger A L, Amaral L A N, Jeffrey M H, Ivanov P C, Peng C K, Stanley H E 2002 Proc. Nat. Acad. Sci. 99 2466
[8] ［8］Zhuang J J, Ning X B, Yang X, Hou F Z, Huo C Y 2008 J. Nanjing Univ. 44 57 (in Chinese) ［庄建军、宁新宝、杨希、侯凤贞、霍铖宇 2008 南京大学学报 44 57］
[9] ［9］Deng Y, Shi W K, Liu Q 2002 Acta Phys. Sin. 51 759 (in Chinese) ［邓勇、施文康、刘琪 2002 物理学报 51 759］
[10] ］You R Y, Chen Z 2005 Chin. Phys. B 14 2176
[11] ］Deng Y Q, Cao S Y, Yu J, Xu T, Wang Q Y, Zhang Z G 2008 Acta Phys. Sin. 57 7017 (in Chinese) ［邓玉强、曹士英、于靖、徐涛、王清月、张志刚 2008 物理学报 57 7017］
[12] ］Ren L, Chen X G, Liu C T 2009 Acta Phys. Sin. 58 2035 (in Chinese) ［任磊、陈祥光、刘春涛 2009 物理学报 58 2035］
[13] ］Zhao W S, He Y G 2009 Acta Phys. Sin. 58 843 (in Chinese) ［赵文山、何怡刚 2009 物理学报 58 843］
[14] ］ Sahambi J S, Tandon S N, Bhatt R K P 1997 IEEE Eng. Med. Biol. 16 77
[15] ］Daubechies I 1992 Ten Lectures on Wavelets (Philadelphia: Society for Industrial and Applied Mathematics) p194
[16] ］Mallat S 1998 A Wavelet Tour of Signal Processing (San Diego: Academic Press) p10
[17] ］Zhao L, Feng J, Zhai G J, Zhang L H 2005 Acta Phys. Sin. 54 943 (in Chinese) ［赵莉、冯稷、翟光杰、张利华 2005 物理学报 54 1943］
[18] ］Zhu H J, Qin S R, Peng L L 2002 Chin. J. Mech. Eng. 38 10 (in Chinese) ［朱洪俊、秦树人、彭丽玲 2002 机械工程学报 38 10］
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