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Nonlinear Analysis of Auscultation Signals in TCM Using the Combination of Wavelet Packet Transform and Sample Entropy.

Yan JJ, Wang YQ, Guo R, Zhou JZ, Yan HX, Xia CM, Shen Y - Evid Based Complement Alternat Med (2012)

Bottom Line: SampEns for WPT coefficients were computed to quantify the signals from qi- and yin-deficient, as well as healthy, subjects.Then, SampEn values for approximated and detailed coefficients were calculated.The recognition accuracy rates were higher than 90%.

View Article: PubMed Central - PubMed

Affiliation: Center for Mechatronics Engineering, East China University of Science and Technology, Shanghai 200237, China.

ABSTRACT
Auscultation signals are nonstationary in nature. Wavelet packet transform (WPT) has currently become a very useful tool in analyzing nonstationary signals. Sample entropy (SampEn) has recently been proposed to act as a measurement for quantifying regularity and complexity of time series data. WPT and SampEn were combined in this paper to analyze auscultation signals in traditional Chinese medicine (TCM). SampEns for WPT coefficients were computed to quantify the signals from qi- and yin-deficient, as well as healthy, subjects. The complexity of the signal can be evaluated with this scheme in different time-frequency resolutions. First, the voice signals were decomposed into approximated and detailed WPT coefficients. Then, SampEn values for approximated and detailed coefficients were calculated. Finally, SampEn values with significant differences in the three kinds of samples were chosen as the feature parameters for the support vector machine to identify the three types of auscultation signals. The recognition accuracy rates were higher than 90%.

No MeSH data available.


Related in: MedlinePlus

Original signal and amplitude spectrum for it.
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fig3: Original signal and amplitude spectrum for it.

Mentions: The vowel /a/ was chosen as the utterance. Each subject produced a stable phonation of a sustained English vowel /a/ lasting about one second. This vowel is chosen because both patients and healthy subjects can easily pronounce this vowel. In addition, the vocal organ is not abuttal, and there is no obstacle in the cavity when this vowel is pronounced [20]. The pronunciation flow is unblocked, and a periodical waveform can be produced. Therefore, the vowel /a/ was mainly recently chosen as the utterance. The time-domain plot and spectrum of the vowel /a/ are shown in Figure 3.


Nonlinear Analysis of Auscultation Signals in TCM Using the Combination of Wavelet Packet Transform and Sample Entropy.

Yan JJ, Wang YQ, Guo R, Zhou JZ, Yan HX, Xia CM, Shen Y - Evid Based Complement Alternat Med (2012)

Original signal and amplitude spectrum for it.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3369240&req=5

fig3: Original signal and amplitude spectrum for it.
Mentions: The vowel /a/ was chosen as the utterance. Each subject produced a stable phonation of a sustained English vowel /a/ lasting about one second. This vowel is chosen because both patients and healthy subjects can easily pronounce this vowel. In addition, the vocal organ is not abuttal, and there is no obstacle in the cavity when this vowel is pronounced [20]. The pronunciation flow is unblocked, and a periodical waveform can be produced. Therefore, the vowel /a/ was mainly recently chosen as the utterance. The time-domain plot and spectrum of the vowel /a/ are shown in Figure 3.

Bottom Line: SampEns for WPT coefficients were computed to quantify the signals from qi- and yin-deficient, as well as healthy, subjects.Then, SampEn values for approximated and detailed coefficients were calculated.The recognition accuracy rates were higher than 90%.

View Article: PubMed Central - PubMed

Affiliation: Center for Mechatronics Engineering, East China University of Science and Technology, Shanghai 200237, China.

ABSTRACT
Auscultation signals are nonstationary in nature. Wavelet packet transform (WPT) has currently become a very useful tool in analyzing nonstationary signals. Sample entropy (SampEn) has recently been proposed to act as a measurement for quantifying regularity and complexity of time series data. WPT and SampEn were combined in this paper to analyze auscultation signals in traditional Chinese medicine (TCM). SampEns for WPT coefficients were computed to quantify the signals from qi- and yin-deficient, as well as healthy, subjects. The complexity of the signal can be evaluated with this scheme in different time-frequency resolutions. First, the voice signals were decomposed into approximated and detailed WPT coefficients. Then, SampEn values for approximated and detailed coefficients were calculated. Finally, SampEn values with significant differences in the three kinds of samples were chosen as the feature parameters for the support vector machine to identify the three types of auscultation signals. The recognition accuracy rates were higher than 90%.

No MeSH data available.


Related in: MedlinePlus