Digital filter coefficient setting apparatus for and digital filter coefficient setting method

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 corresponding to a specified filter coefficient element;
• a coefficient selecting unit for searching and 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, 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, outputting an address indicating a location of said specified filter coefficient element in said coefficient storing unit when it is judged that said specified filter coefficient element is searched and selected, and outputting said specified coefficient parameter when it is judged that said specified filter coefficient element is not selected;
• a coefficient obtaining unit for obtaining said specified filter coefficient element stored in said coefficient storing unit with reference to said address outputted by said coefficient selecting unit, 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 when said specified filter coefficient element is not selected by said coefficient selecting unit, whereby
• said coefficient selecting unit is operative to output said specified coefficient parameter to said coefficient calculating unit 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 thus received.