Data processing method and device

Abstract

For an input signal with a ringing superposed thereon, a ringing-generating filter (12) generates an analogous ringing waveform from only a peak portion of the signal which precedes the ringing. A subtractor (11) subtracts the analogous ringing waveform from the input signal to eliminate the ringing. The coefficient of the filter (12) is determined by applying a calculation method similar to a polynomial division based on the complete pivoting Gaussian elimination to polynomials using a reference data expressing a peak waveform and a ringing waveform, and by using a least squares method for minimizing the square of the covariance so as to allow the presence of noise in the data. Furthermore, by a repetitive process on a plurality of the same datasets, the calculation accuracy of the coefficient is improved even under the condition that the ringing frequency is high and the number of samples in one cycle is small. Thus, the ringing can be correctly eliminated even if the signal frequency is high.

Description

Technical field [0001] The present invention relates to a data processing method and device for removing ringing from a signal with ringing in a peak waveform through digital signal processing. The data processing method and apparatus according to the present invention can be suitably used to remove, for example, oscillations that appear in the detection signal obtained by the ion detector of the time-of-flight mass spectrometer (TOF-MS). Background technique [0002] In the time-of-flight mass analyzer (TOF-MS), the ions separated by the time-of-flight mass analyzer according to the mass-to-charge ratio m / z reach the ion detector, and the output from the ion detector corresponds to the number of ions that arrive The intensity of the peak detection signal. In the TOF-MS data processing device, a time-of-flight spectrogram with time on the horizontal axis and signal intensity on the vertical axis is created from the detection signal obtained as described above, and the mass spect...

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Problems solved by technology

[0006] However, with regard to the oscillation removal method described in Patent Document 2 above, the estimation accuracy of the oscillation waveform is not good enough under the following conditions, that is, the S / N ratio difference of the signal in the time region where the oscillation occurs, and the frequency of the oscillation itself relative to the frequency used to estimate the signal. The sampling frequency for A / D conversion is relatively high, and there are few sampling points (about 5 to 10) in one cycle of the oscillation waveform.

Therefore, the above-mentioned method is not suitable for oscillation removal of detection signals in high-mass resolution mass spectrometers such as TOF-MS, which tend to be disadvantageous as described above.

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