Patent ID: 6420875
Filing Date: 2002-07-16
Classification: H02H

Abstract:
A filter for a circuit protection device, comprising:a first filter device connected to receive an input signal v, the first filtering device generating an intermediate signal v1, wherein v1&it;(k)=&Sum;n=0x&it;hn&CenterDot;v(k-n),â€ƒwhere k is a sample index, and h0 . . . hx are first filter coefficients; and a second filtering device connected to receive said intermediate signal v1 from said first filtering device, and to generate an output signal v2, wherein v2&it;(k)=&Sum;n=0y&it;gn&CenterDot;v1&it;(k-n),â€ƒwhere g0 . . . gy are second filter coefficients, the second filtering device connected to provide the output signal v2 to a Fourier algorithm.