A method for improving the efficiency of FIR filter operation

When the software realizes the FIR filter, it usually carries on the cyclic shift to the multiple input data according to the FIR filtering formula. After the completion of the shift, it can get the filtering result by multiplying with the FIR parameters. The higher the filtering order, the more the filtering channels, the longer the software running time will be consumed. In order to save software running time, this paper proposes a software implementation method which called copying the filter parameters. The FIR parameters are copied once, and only the latest input data is assigned in the operation process. It can directly multiply the data and parameters to get the filtering result, so as to save the software running time.