FILTER DEVICE

• Main Authors: TANI, Shigenori, YAMASHITA, Yasutaka, UCHIDA, Shigeru, KANEKO, Kazuma
• Format: Patent
• Language: English; French; German
• Published: 17.08.2022
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

A filter device (100) includes: a plurality of delay units (1-1 to 1-N) connected in series to give a delay to an input signal and output a delayed signal; a plurality of multiplication units (2-0 to 2-N) that multiply the delayed signal by a filter coefficient generated based on a predetermined value and a multiplying factor adjustment value; a coefficient adjustment unit (3) that, when a multiplication result obtained by multiplying the predetermined value by the multiplying factor adjustment value exceeds a maximum value of a representation range of the filter coefficient, divides the multiplication result exceeding the maximum value by the maximum value, and outputs a quotient of the division as a coefficient adjustment value; a signal conversion unit (4) that outputs a signal obtained by adding after-filter-coefficient-multiplication signals outputted by the multiplication units and an adjusted signal obtained by adjusting a corresponding delayed signal using the coefficient adjustment value; and a division unit (5) that generates an output signal by dividing the signal outputted by the signal conversion unit by the multiplying factor adjustment value.