Signal base line processing equipment and processing method

Abstract

The invention discloses a baseline processing device that aims at signals containing pulses in uneven distribution and baselines in slow transformation, which comprises the following components: an A / D sampling unit used for sampling a counting signal and obtaining sample data, a baseline extracting unit used for inputting the sample data, and when the number of the input sample datum is equal to or more than N, the N sample datum are ordered by size according to the sampled order in each time, and any sample data A in the N sample datum with size equal to a mean value is output, wherein, the width of the N sample datum is much more than the width of a single pulse in a digital signal, less than the width of baseline drift, and more than two times of the width sum of all pulses in the distribution width, a phase compensating unit used for inputting the digital signal and outputting sample data B in the first-in-first-out order, the width of the phase compensating unit is M, which equals to a half of N, and a first subtractor used for inputting the sample data A and the sample data B, and outputting the result of the sample data B subtracted by the sample data A as baseline data.

Description

【Technical field】 [0001] The present invention relates to a signal processing device and processing method, in particular to a signal baseline processing device and processing method. 【Background technique】 [0002] During measurement, due to external interference, the baseline of the signal will fluctuate. When identifying the amplitude of the signal with pulse characteristics in the signal, the slowly fluctuating baseline will affect the accurate identification of the amplitude of the signal with pulse characteristics in the signal. For example, in a particle detection system (such as a blood cell analyzer), the volume of the particle is judged according to the peak value of the identified pulse. When particles (such as blood cells) flow through the sensor (jewel hole), an electrical pulse signal whose amplitude is proportional to the volume of the particles (blood cells) will be generated in the counting signal, such as figure 1 As shown, the counting signal becomes a di...

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Problems solved by technology

[0004] 1. The fluctuating baseline is superimposed on the counting signal, raising or lowering the peak value of the pulse, which affects the accurate identification of the pulse peak value in the digital counting signal, such as figure 2 shown;

[0005] 2. The fluctuating baseline affects the compression efficiency of the digital counting signal;

[0011] 1. Poor versatility: changes in the characteristics of the counting signal will affect the judgment of the pulse duration, thereby affecting the identification of the baseline, and then affecting the accurate identification of the pulse peak;

[0012] 2. The identification of baseline and the identification of pulse characteristic values ​​(including pulse start point, peak value, end point, etc.) affect each other, resulting in complex processing methods and difficult debugging

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