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**Signal processing and sampling method for obtaining time series corresponding to higher order derivatives.**
*(English)*
Zbl 1191.94076

Summary: For modeling and controlling dynamic phenomena it is important to establish with higher accuracy some significant quantities corresponding to the dynamic system. For fast phenomena, such significant quantities are represented by the derivatives of the received signals. In case of advanced computer modeling, the received signal should be filtered and converted into a time series corresponding to the estimated values for the dynamic system through a sampling procedure. This paper will show that present-day methods for computing in a robust manner the first derivative of a received signal (using an oscillating system working on a limited time interval and a supplementary differentiation method) can be extended to the robust computation of higher order derivatives of the received signal by using a specific set of second-order oscillating systems (working also on limited time intervals) so as estimative values for higher-order derivatives are to be directly generated (avoiding the necessity of additional differentiation or amplifying procedures, which represent a source of supplementary errors in present-day methods).

### MSC:

94A20 | Sampling theory in information and communication theory |

94A12 | Signal theory (characterization, reconstruction, filtering, etc.) |

62M10 | Time series, auto-correlation, regression, etc. in statistics (GARCH) |

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\textit{A. Sterian} and \textit{A. Toma}, Math. Probl. Eng. 2010, Article ID 913147, 9 p. (2010; Zbl 1191.94076)

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