| 摘要 |
A self-tracking bandpass filter (1) comprises a controllable filter (10) having a signal input (11) for receiving a signal ( phi ) to be filtered, a bandpass output (13) for providing a bandpass signal (S>BP<) having a center frequency (f>0<), and a control input (15) for receiving a control signal (S>C<); and a control unit (20) coupled to the control input (15) of the controllable filter (10), adapted to generate the control signal (S>C<) in such a way that the center frequency (f>0<) of the bandpass characteristic (H>B<) of the controllable filter (10) is substantially equal to the frequency (f) of the input signal ( phi ).
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