Logarithm field simulation wavelet converting circuit for detecting electrocardiosignal QRS wave

A technology of electrocardiographic signal and wavelet transformation, which is applied in the field of logarithmic domain analog wavelet transformation circuit, can solve problems such as the impossibility of applying implantable artificial cardiac pacemakers

Inactive Publication Date: 2008-08-20
HUNAN UNIV
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Problems solved by technology

[0003] In order to solve the technical problems existing in the existing electrocardiographic signal QRS wave detection device, the present invention provides a logarithmic domain analog wavelet transform circuit for electrocardiographic signal QRS wave detection. The present invention has low voltage, low power consumption, and wide dynamic range With the characteristics of working frequency and easy monolithic integration, it can realize the continuous wavelet transform of ECG signal in real time under the condition of low power consumption, so as to overcome the inability of the existing wavelet transform QRS wave detection technology to be applied to implantable artificial heart pacing problems in the

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  • Logarithm field simulation wavelet converting circuit for detecting electrocardiosignal QRS wave
  • Logarithm field simulation wavelet converting circuit for detecting electrocardiosignal QRS wave
  • Logarithm field simulation wavelet converting circuit for detecting electrocardiosignal QRS wave

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Embodiment Construction

[0020] See Figure 1, Figure 1 shows the block diagram of the continuous wavelet transform analog circuit of the ECG signal, that is, the analog wavelet transform circuit is composed of 4 parallel analog filters, and the 4 logarithmic domain filters complete the ECG signal at the characteristic scale in parallel. Continuous Gaussian first-order derivative wavelet transform under 21~24, i in is the signal input terminal, i out1 ~i out4 is the output terminal of wavelet transform of the signal.

[0021] The principle of implementing wavelet transform with analog filter is:

[0022] Suppose the input continuous signal is x(t), according to the definition of continuous wavelet transform, the mother wavelet function ψ(t) is displaced by τ, and then interpolated with the signal x(t) to be analyzed at different scales a (>0). Then the continuous wavelet transform WT of x(t) can be obtained x . which is

[0023] W T x ...

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Abstract

The invention discloses a log domain analog wavelet transform circuit for detecting an electrocardiogram signal QRS wave, comprising a forming circuit of differential input current signals and a current mirror circuit, four parallel log domain differential voltage filter circuits, four log differential compression circuits and four exponential differential expanded circuits. Each input of the log domain differential voltage filter circuits is connected with the forming circuit of differential input current signals and the current mirror circuit through the log differential compression circuits. Each output of the log domain differential voltage filter circuits is connected with an input of the exponential differential expanded circuits. The log domain analog wavelet transform circuit has the advantages of being integrated in a piece of analog integrated circuit, real-time realizing continuous wavelet transform under the characteristic dimension of the electrocardiogram signals with low power consumption, satisfying application requirements of an implanted artificial cardiac pacemaker for low power consumption and small size.

Description

technical field [0001] The invention relates to a detection device for the QRS wave of the electrocardiographic signal, in particular to a logarithmic domain analog wavelet transform circuit for detecting the QRS wave of the electrocardiographic signal. Background technique [0002] The automatic analysis and processing of ECG signals has always been one of the important research topics in the field of biomedical engineering. The micro medical device represented by the implantable artificial cardiac pacemaker is an important medical device for modern heart disease treatment. It analyzes and detects the electrocardiographic signal (ECG) obtained by the catheter electrode, and takes correct actions to give patients The heart is stimulated with appropriate electrical pulses. With the wide application of VLSI and modern signal processing technology, the function of pacemaker is constantly improving, and it is developing in the direction of long life, miniaturization, high relia...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0472G06F17/14A61B5/366
Inventor 何怡刚李宏民彭玉楼齐绍忠尹新
Owner HUNAN UNIV
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