Patent ID: 6212540
Filing Date: 2001-04-03
Classification: H03H

Abstract:
A filter circuit for orthogonal two-axis (x, y) signals wherein input signals related to orthogonal two axes (whose quantities of Laplace transformation are represented by Ux, Uy, respectively) are expressed by a complex variable U=Ux+jUy, a transfer function of a lowpass or highpass filter of real coefficients is represented by F(s), a central angular frequency to be passed or stopped is represented by .omega., a complex coefficient transfer function produced by replacing the Laplace operator ""s"" in the transfer function F(s) is represented by F(s-j.omega.), and when the complex variable U is passed through the complex coefficient transfer function F(s-j.omega.), output signals related to the orthogonal two axes (whose quantities of Laplace transformation are represented by Vx, Vy, respectively) are expressed by a complex variable (V=Vx+jVy), and a transfer representation equation is expressed by:U.multidot.F(s-j.omega.)=Vcharacterized in that connections are made with a transfer element of real coefficients in order to equalize real and imaginary parts of the transfer representation equation after both sides of the transfer representation equation are multiplied by the denominator of F(s-j.omega.), and .omega. is to multiply as an input signal from a separate path when it is a time function.