| Popis: |
A new kind of FIR (Finite Impulse Response) digital filter is recently described, which is intended for the filtering of impulse periods. This filter is by nature a Frequency Locked Loop (FLL), which is based on the measurement and processing of the input periods only. In this article, the general equations for transfer functions of FLL of any order are derived, as well as the general Z transformations of the FLL outputs. These general equations enable fast and simple adapting FLL of any order to function as digital filter, using Mat-lab tools, dedicated for the design of the classical FIR digital filter. The application of these equations is demonstrated on the development of digital filter based on FLL of the fifth order. The filtering ability of the fifth-order FLL is demonstrated for one practical example. |
