A filtering technique which makes it possible to easily and appropriately
eliminate a noise without increasing a scale of a circuit necessary for a
filtering process even if a noise frequency is liable to be changed is
provided. A filter coefficient calculator (6) of a weight measurement
apparatus calculates filter coefficients using a predetermined arithmetic
expression and outputs them to a signal processor (5). The signal
processor (5) carries out a filtering process on a weighing signal (Ds)
using the filter coefficients. The arithmetic expression includes a
parameter specifying a band position of an attenuation band where
attenuation must be locally enhanced. A user can input a value of the
parameter via a data entry part (7). In this manner, the filter
coefficients can be changed by using a parameter specifying the band
position of the attenuation band which is physical and thus easy to
grasp. Accordingly, it is possible to easily move the attenuation band,
and thus noise can be eliminated easily and appropriately.