Patent ID: 7130875

Claim:
A digital filter coefficient setting apparatus comprising: a processor including a digital filter for filtering a digital signal in accordance with a digital filter characteristic varied in response to a filter coefficient element; a coefficient storing unit for storing a plurality of filter coefficient elements respectively in association with a plurality of coefficient parameters; a parameter inputting unit for inputting a specified coefficient parameter; a coefficient selecting unit for selecting a specified filter coefficient element corresponding to said specified coefficient parameter inputted by said parameter inputting unit from among said plurality of filter coefficient elements stored in said coefficient storing unit, and judging whether said specified filter coefficient element is selected or not from among said plurality of filter coefficient elements stored in said coefficient storing unit; a coefficient obtaining unit for obtaining said specified filter coefficient element stored in said coefficient storing unit with reference to an address and outputting said specified filter coefficient element thus obtained to said processor; and a coefficient calculating unit for calculating a specified filter coefficient element on the basis of said specified coefficient parameter inputted by said parameter inputting unit and outputting said specified filter coefficient element thus calculated to said processor and in which said coefficient selecting unit is operative to output an address indicative of a location of said specified filter coefficient element in said coefficient storing unit to have said coefficient obtaining unit obtain said specified filter coefficient element when it is judged that said specified filter coefficient element is selected, and to output said specified coefficient parameter to have said coefficient calculating unit calculate said specified filter coefficient element when it is judged that said specified filter coefficient element is not selected, and said processor is operative to set said digital filter in response to said filter coefficient element selectively obtained by said coefficient obtaining unit and calculated by said coefficient calculating unit.