| 摘要 |
A two-stage filter (20) for a circuit protection device. The filter includes a first filtering device (22) connected to receive an input signal v, the first filtering device (22) generating an intermediate signal v1, (1), where k is a sample index and h0...h20 are first filter coefficients. A second filtering device (24) filters the intermediate signal to generate an output signal v2, (2), where g0...g74 are second filter coefficients. A Fourier algorithm is applied to the output signal to generate a control signal for the circuit protection device.
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