Method and device for quickly processing signal base line

Abstract

The invention discloses a method and device for quickly processing a signal base line. By utilizing the important information that the sample data is increased point by point, a quick median calculation method is provided and a median filter is realized on such basis, wherein the operation of removing the signal base line is realized by subtracting a median filter output result from an original data. The method comprises the following steps: a) selecting a proper filtering window length k, using a current processing point as a reference point, and filling the filtering window with proper data sequence; b) if the current point is a starting point, searching for the data in the filtering window and outputting the median as the signal base line of the current processing point; c) if the current point is not the starting point, calculating the median in the filtering window by using the quick median calculation method and outputting the median as the signal base line of the current processing point; and d) subtracting a signal base line output value of the current processing point from a collected current processing point value and outputting the result as a data removing the signal base line.

Description

technical field [0001] The invention provides a method and device for quickly processing a signal baseline. Background technique [0002] During signal acquisition, due to factors such as zero drift, low-frequency interference, and poor sensor contact, the signal baseline may fluctuate slowly. When measuring the amplitude of a pulse signal, this slow fluctuation will distort the pulse amplitude measurement. For example, in some particle detection systems (especially blood cell analyzers), the distortion of the pulse amplitude measurement will lead to serious deviations of many measurement parameters, and obviously this result is not expected. For example, in a particle detection system (especially a blood cell analyzer), when a particle (or cell) passes through a micropore, it will generate a pulse signal whose amplitude is proportional to the volume, such as figure 1 shown. [0003] In particle detection systems (especially blood cell analyzers), due to the high sampling...

AI Technical Summary

Problems solved by technology

Even according to the method disclosed in the Chinese patent application number 200710075884.7 technical document, for processing N data sequence points, if the window length used is k, at least 2*k*N comparisons and (k*N+k*N / 2) Second addition, for the case of uneven data distribution, more calculations are required

Although the complexity level of the algorithm is already O(N), for applications with large data volume (such as more than 20M data points) and high real-time requirements, the amount of calculation is still too large. Due to the existence of addition operations, hardware The implementation logic is also more complex

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