RECURSIVE HALF-BAND FILTER, AND METHOD FOR FITERING USING THE FILTER

摘要

PURPOSE: A recursive type half band filter and a filtering method using the same are provided to replace multilevel half band filter with one half band filter. CONSTITUTION: A recursive type half band filter (100) comprises a first storing part (110), a second storing part (120), a calculating part (130), and a controlling part (140). The first storing part controls first input data among a plurality of input data composed of first input data and second input data, which are sequentially repeated at least once, to be impeded prior to be stored before second input data is inputted. The second storing part stores second input data. The calculating part multiplies the second input data with a predetermined filter coefficient before adding to the first input data, which is stored at the first storing part, for producing output data. Whether the output data is predetermined final output data allows the controlling part to determine the output data as final output data or as new input data. [Reference numerals] (110) First storing part; (120) Second storing part; (130) Calculating part; (141) Input controlling part; (142) Output controlling part; (143) Calculation stage control part; (144) Address control part