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
CN104779934BActive Publication Date: 2018-04-24合肥矽景电子有限责任公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
合肥矽景电子有限责任公司
Publication Date
2018-04-24

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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.
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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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