ADAPTIVE DIGITAL FILTER, FM RECEIVER, SIGNAL PROCESSING METHOD, AND PROGRAM

摘要

A complex signal in which one of two signals that have been generated from a single real signal and that have phases that are shifted 90° with respect to each other is a real part and the other signal is an imaginary part is applied as input to an input terminal (301). A filter unit generates an output signal that is a complex signal by means of a convolution operation of the input signal, and a filter coefficient that is a real signal and supplies this output signal to an output terminal (302). A coefficient control unit made up from a common unit (318) and separate units (319 0 -319 N-1 ) updates the filter coefficients such that the value of the envelope of the output signal approaches a target signal.