DIGITAL FILTER AND FILTER CHARACTERISTIC MODIFICATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a digital filter that can suppress the generation of a discontinuous change in a filtering result when a filter characteristic is modified by switching a coefficient vector.SOLUTION: When switching from a first coefficient vector to a second coefficient vector, a coefficient switching section 240A subtracts the first coefficient vector from the second coefficient vector to calculate a difference vector. Subsequently, on the basis of the calculated difference vector, an update amount vector for stepwise switching from the first coefficient vector to the second coefficient vector is calculated. On the basis of the update amount vector thus calculated, the coefficient switching section 240A switches stepwise from the first coefficient vector to the second coefficient vector.