An RC filter method and RC filter for blood pressure and heart rate test

A filter and heart rate technology, applied in impedance networks, digital technology networks, electrical components, etc., can solve the problem of low filtering characteristics of RC filters, and achieve the effects of improving accuracy and flexibility, reducing costs, and flexible design

Active Publication Date: 2018-04-24
合肥矽景电子有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem in the prior art that the filtering characteristics of the RC filter are not high when testing blood pressure and heart rate, the present invention proposes an RC filtering method and an RC filter for blood pressure and heart rate testing

Method used

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  • An RC filter method and RC filter for blood pressure and heart rate test
  • An RC filter method and RC filter for blood pressure and heart rate test
  • An RC filter method and RC filter for blood pressure and heart rate test

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Embodiment 1

[0060] like figure 1 As shown, the RC filtering method used for blood pressure and heart rate testing in this embodiment includes:

[0061] Step S101: collecting the analog signal to be processed, converting the analog signal into a digital signal, and obtaining the original data of the digital signal;

[0062] Specifically, the heartbeat analog signal to be processed can be sampled through the SPI protocol and converted into a digital signal.

[0063] Step S102: Perform high-frequency filtering processing on the original data of the digital signal to obtain preliminary processed data after filtering high-frequency;

[0064] Specifically, it is to filter out the high-frequency signal in the digital signal so that the low-frequency signal can be clearly displayed.

[0065] Step S103: storing the first N preliminary processing data, wherein N is a positive integer greater than or equal to 20;

[0066] Specifically, the data should be stored in the resources of the single-chip...

Embodiment 2

[0076] like figure 2 As shown, when the stored preliminary processing data increases, the RC filtering method for blood pressure and heart rate testing also includes:

[0077] Step S106: storing the N+1th preliminary processing data, and deleting the first one of the first N preliminary processing data;

[0078] Specifically, using the idea of ​​the stack, every time a new raw data is collected, the first incoming and stored data will be deleted, and then the current raw data will be enlarged and processed before being stored. Here we need to use the resources of the single-chip microcomputer, the single-chip microcomputer The storage space and processing speed can fully meet the requirements, and the data should be stored in the resources of the single-chip microcomputer.

[0079] Step S107: Carry out N-order product summation operation and 20-order product summation operation on the 2nd to N+1th preliminary processing data respectively;

[0080] Specifically, when adding ...

Embodiment 3

[0083] This embodiment is a specific description of step S102, as image 3 shown, including:

[0084] Step S301: According to the frequency of the original data of the digital signal, determine a base number, the base number is two-thirds of the frequency, and randomly set an amplification factor, the amplification factor is a positive number;

[0085] Step S302: Subtract the base number from the frequency of the original data of the digital signal and multiply it by the amplification factor, perform high-frequency filtering processing, and increase or decrease the base number and sum according to the filtering result of the digital signal Amplify the factor until the filtered digital signal can display low-frequency signals, and use the data at this time as the preliminary processing data.

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Abstract

The invention discloses an RC filter method and an RC filter for testing blood pressure and heart rate, wherein the method includes: step A: collecting an analog signal to be processed, converting the analog signal into a digital signal, and obtaining a digital signal raw data; step B: filter out the high-frequency processing on the original data of the digital signal, and obtain the preliminary processed data after filtering out the high frequency; step C: store the first N described preliminary processed data, wherein N is greater than A positive integer equal to 20; step D: according to the filter coefficients corresponding to the N preliminary processing data, respectively perform N-order product summation and 20-order product summation operations on the N preliminary processing data; Step E: The result of the N-order product summation operation is subtracted from the result of the 20-order product summation operation to obtain a frequency-filtered digital signal. The RC filtering method and the RC filter of the present invention eliminate the influence of external factors, improve precision and flexibility, and increase processing bandwidth.

Description

technical field [0001] The invention relates to the technical field of high-frequency filtering for heartbeat detection, in particular to an RC filtering method and an RC filter for testing blood pressure and heart rate. Background technique [0002] In the filter design, due to the influence of various factors, the filtering characteristics of the filter (the ability to filter out high frequency or low frequency) cannot reach the theoretical value, so it is more difficult to design the filter using hardware circuits . [0003] The first is the driving ability of the RC filter. Because the driving ability is weak, it must be an active RC filter, which increases the power consumption of the circuit. Secondly, due to interference between circuits, electromagnetic field interference, and external clock interference, etc., the filtering characteristics of the RC filter will change. Finally, there is the problem of temperature. As the working time goes by and the temperature ri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 郑云华吉蒙侯颖韩基东
Owner 合肥矽景电子有限责任公司
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