Patent ID: 9571066
Date: 2017-02-14
CPC Classifications: G06F,H03H

Claim:
1. A digital filter circuit, comprising: a complex conjugate generation unit that generates a second complex number signal including respective conjugate complex numbers of all complex numbers included in a first complex number signal of a frequency domain generated by converting a complex number signal of a time domain by Fourier transform; a filter coefficient generation unit that generates a first and a second frequency domain filter coefficient of a complex number from a first, a second and a third input filter coefficient of a complex number having been inputted; a first filtering unit that performs filtering processing to the first complex number signal by the first frequency domain filter coefficient, and outputting a third complex number signal; a second filtering unit that performs filtering processing to the second complex number signal by the second frequency domain filter coefficient, and outputting a fourth complex number signal; and a complex conjugate combining unit that combines the third complex number signal and the fourth complex number signal, and generating a fifth complex number signal.