| 摘要 |
A digital filter is provided with: integration calculation units (10) in which the data of M channels is subjected to time-division multiplexing, said units (10) being cascade-connected using, as an input, time-division-multiplexed data obtained by updating the data of each channel at the rate of a sampling frequency fS, the integration calculation units (10) operating according to a clock having a frequency fS × M, and the time-division-multiplexed data being integrated for each M sample; a frequency conversion unit (11) operated according to a clock having a frequency fD × M, the data of sampling frequency fS inputted from the final-stage integration calculation unit (10) being culled at a sampling frequency fD, and the culled data being given an (M-1) sample delay; and differential calculation units (12) operated according to a clock having a frequency fD × M, said units (12) being cascade-connected to the output of the frequency conversion unit (11), and data that has not yet been M-sampled being subtracted from the input data by each of the differential calculation units (12). |
