| 摘要 |
A near ideal single frequency and band pass filter comprises an input unit, a filter combination, and an output unit. The input unit accepts an input signal which can be expressed with a mathematical formula f(t). The filter combination comprises a plurality of filters, wherein each filter can generate a control signal and performs the signal filtering process based on the control signal. The control signal can be expressed with a mathematical formula hde(&thetas;). The filter combination processes the input signal based on a set of a plurality of control signals by means of a formula.
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