| 摘要 |
PROBLEM TO BE SOLVED: To provide filter design for reducing the influence of system function degradation caused by an error source. SOLUTION: The error source is reduced by using parallel first and second input signal data paths in this filter structure, The first data path includes a digital FIR filter 200 having a small number of non-zero multiplier coefficients. The second data path includes an FIR and IIR digital filter 204 consisting of a small number of non-zero coefficients and plural serially connected filters (202...) including one of a set of plural frequency stop-off filters. A signal with a different frequency selected by each stop-off filter is not transmitted. Then the frequency response value of the filter structure in the neighboring part of the selected different frequency of the set id mostly anchored to the corresponding theoretical impulse frequency response value of the FIR and IIR digital filter in the first data path in each neighboring part of the selected plural different frequencies of the set.
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