Signal analysis of human pulse wave based on blind deconvolution

Xutong LI; Hui QI; Huawei ZOU

ABSTRACT

BACKGROUND:

The human body pulse signal can be regarded as the convolution of the heart excitation resource signal and the pulse transfer system. The backward signal was studied more before, but the research to the forward signal is not enough.

OBJECTIVE:

To extract the heart excitation source signals in human pulse wave.

DESIGN:

A randomized controlled design.

SETTING:

Second Affiliated Hospital of China Medical University;Biomedical Engineering institute of Shandong University.

PARTICIPANTS:

Health physical-examined persons in the Second Affiliated Hospital of China Medical University on March 11,2004 were recurited. RM6240 physiological signals collection system was adopted.

METHODS:

The collection of pulse wave in healthy persons was input into system-analysis mode and based on the principle of blind deconvolution and feasible arithmetic, heart source signals were obtained.MAIN OUTCOME

MEASURES:

①Normal human pulse wave ②The heart excitation source signals.

RESULTS:

In the back-half segment of cepstrum (n＞ n0), periodic impulse was in accordance with the basic human pulse frequency. There was an excitation source in the pulse wave. If high-pass filter was defined to the signal (when n0 equals to 30 in the experimentation the result will be best.), we could get the heart excitation source signal after it was filtered, F transformation, index and inverse transformation.

CONCLUSION:

This method is practical and feasible and will provide a basis to further analyze pulse wave.