A digital filter circuit includes retrieve stream data as a digital signal, and cyclically operate a first phase and a second phase. The circuit includes a short-term storage unit configured to store a local state variable, a long-term storage unit configured to store a global state variable, a first phase synthesizing unit that outputs the digital signal in the first phase under an influence of the local state variable stored in the short-term storage unit, and a second phase synthesizing unit that outputs the digital signal in the second phase under an influence of the global state variable stored in the long-term storage unit, where an output from the first phase synthesizing unit and an output from the second phase synthesizing unit are caused to generate an interference due to a phase shift.

A digital filter circuit includes retrieve stream data as a digital signal, and cyclically operate a first phase and a second phase. The circuit includes a short-term storage unit configured to store a local state variable, a long-term storage unit configured to store a global state variable, a first phase synthesizing unit that outputs the digital signal in the first phase under an influence of the local state variable stored in the short-term storage unit, and a second phase synthesizing unit that outputs the digital signal in the second phase under an influence of the global state variable stored in the long-term storage unit, where an output from the first phase synthesizing unit and an output from the second phase synthesizing unit are caused to generate an interference due to a phase shift.