Patent attributes
A digital filter includes a data storage section, a filter coefficient storage section, a multiplier, an accumulative adder section, a data output section and a control section. The data storage section stores the latest multiple input data for every channel and outputs the stored input data in response to a selection signal. The filter coefficient storage section stores predetermined filter coefficient corresponding to the multiple input data. The accumulative adder section adds the result of multiplication of multiple data from the multiplier for every channel. The data output section holds the result of addition in the accumulative adder section and outputting output data. The control section produces the selection signals for sequentially selecting multiple input data corresponding to the channel of the input data every time when the input data is supplied to the data storage section, and produces operating control signals supplied to the filter coefficient storage section, the accumulative adder section and the data output section.
