COMPLEX NUMBER PROCESSING METHOD AND REAL PART PROCESSING METHOD FOR DIGITAL SIGNAL, AND DEVICE BY SAID METHODS

摘要

PURPOSE:To slow down the speed of a multiplier for filtering by using a sign inverter, plural sub filters resulting from decomposing one digital filter and an adder only for the acquisition of a complex number signal from a real part signal. CONSTITUTION:Filter operation is applies to a signal by using sub filters 110, 113, 112, 111 whose transfer functions are respectively H0(-Z4), H3(-Z4), H2(-Z4), H1(-Z4), and outputs of the sub filters 111, 112, 113 are delayed by a delay section 103, a sum section 120 adds the sub filters 110, 112 as a real part output and a sum section 121 adds the sub filters 111, 113 as an imaginary part output, and the delay section 103 is used in common for a sign inversion section 101 and a sign inversion section 151 extracts four inputs each and sign inversion and non-inversion are repeated.