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Single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals

A bioelectric signal and orthogonal square wave technology, applied in the field of biomedical signal acquisition, can solve the problems of affecting signal acquisition accuracy and low signal-to-noise ratio of digital signals, and achieve the goals of reducing circuit cost, high precision, and improving signal-to-noise ratio Effect

Inactive Publication Date: 2017-03-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, when a pure orthogonal square wave is used as the excitation signal, the signal-to-noise ratio of the digital signal obtained in the low-level part of the orthogonal square wave is very low, thereby affecting the acquisition accuracy of the signal

Method used

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  • Single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals
  • Single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals
  • Single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals

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Effect test

Embodiment 1

[0037] A single-channel acquisition device for multi-channel signal modulation by bioelectricity and elevated level quadrature square wave, see figure 1 , the single-channel acquisition device includes: a microprocessor 1, at least two kinds of light-emitting diodes 2, a photosensitive device 3, a current / voltage conversion amplifier 4, a low-frequency bioelectrical signal detection circuit 5, an addition circuit 6 and a single-channel analog-to-digital converter 7,

[0038] The microprocessor 1 outputs quadrature square waves with different frequencies and elevated preset levels, and the orthogonal square waves with elevated preset levels drive at least two types of light-emitting diodes 2, and the light emitted by the light-emitting diodes 2 passes through the finger under test. Received by the photosensitive device 3, the photosensitive device 3 converts it into a current signal, and the current signal is converted into a preset amplitude voltage signal by the current / volta...

Embodiment 2

[0049] A single-channel acquisition device for multi-channel signal modulation by bioelectricity and elevated level quadrature square wave, see figure 1 , the single-channel acquisition device includes: a microprocessor 1, at least two kinds of light-emitting diodes 2, a photosensitive device 3, a current / voltage conversion amplifier 4, a low-frequency bioelectrical signal detection circuit 5, an addition circuit 6 and a single-channel analog-to-digital converter 7. This embodiment is different from Embodiment 1 in that the addition operation circuit 6 is realized by the addition operation circuit 6 designed in the embodiment of the present invention, see figure 2 , the addition operation circuit 6 includes: a first resistor R 1 and the second resistor R 2 ,

[0050] The first resistor R 1 One end is connected to the first signal source V 1 , the second resistor R 2 One end is connected to the second signal source V 2 , the first resistor R 1 the other end and the sec...

Embodiment 3

[0054] A single-channel acquisition device for multi-channel signal modulation by bioelectricity and elevated level quadrature square wave, see figure 1 , the single-channel acquisition device includes: a microprocessor 1, at least two kinds of light-emitting diodes 2, a photosensitive device 3, a current / voltage conversion amplifier 4, a low-frequency bioelectrical signal detection circuit 5, an addition circuit 6 and a single-channel analog-to-digital converter 7. This embodiment is different from Embodiment 1 in that the addition operation circuit 6 can be realized by using the addition operation circuit 6 designed in the embodiment of the present invention, see image 3 , the addition operation circuit 6 includes: a first resistor R 1 and the second resistor R 2 ,

[0055] The first resistor R 1 One end is connected to the first signal source V 1 , the second resistor R 2 One end is connected to the second signal source V 2 , the first resistor R 1 the other end an...

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Abstract

The invention discloses a single-channel acquisition device for bioelectricity and raising level orthogonal square-wave modulation multi-channel signals. A micro-processor outputs orthogonal square-waves in different frequencies and having raised pre-set levels; a photosensitive device converts light into a current signal; the current signal is converted into a pre-set amplitude voltage signal; in a process that the photosensitive device acquires a photoelectric signal, the noise level is not changed; but, because the pre-set level of an orthogonal square-wave signal as a driver is raised, compared with the noise, the orthogonal square-wave signal is obviously improved at the low-level part of the orthogonal square-wave signal; therefore, the signal-to-noise ratio that the photosensitive device obtains the photoelectric signal is increased at the low-level section of the orthogonal square-wave signal; the precision of a digital signal input into the micro-processor is increased; and the micro-processor processes the digital signal, separates a modulated orthogonal square-wave signal and a low-frequency bioelectricity signal, and demodulates multi-channel PPG signals from the modulated orthogonal square-wave signal.

Description

technical field [0001] The invention relates to the field of biomedical signal acquisition, in particular to a single-channel acquisition device for modulating multi-channel signals with bioelectricity and elevated level quadrature square waves. Background technique [0002] The amount of information-carrying changes such as voltage signals is expressed in analog form in its natural state. However, in order to facilitate computer processing, transmission and storage, it is usually converted into a digital signal through an analog-to-digital converter. Therefore, in biological In medical signal processing, analog-to-digital conversion is essential. [0003] In the existing multi-channel biomedical signal acquisition system, it is usually necessary to use a multi-chip ADC or a multi-channel analog switch with a single-chip ADC. The former has the disadvantages of complex circuits, high system power consumption and large circuit size; while the latter will During the acquisiti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/00H03M1/12A61B5/02
CPCH03M1/002A61B5/0059A61B5/02A61B5/72H03M1/1205H03M1/1245
Inventor 李刚宋韶秀林凌
Owner TIANJIN UNIV
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