| 摘要 |
A converter converts time-sequential input digital data Qi having a sampling frequency fm to time-sequential digital data Pj having a sampling frequency fn (fn:fm = n:m, n>m, n, m; an integer), which comprises a time axis compressing converter 6 receiving the time-sequential input digital data Qi, adding (n-m) dummy data DK every m received input data Qi and outputting the combined data at the frequency fn and a single transversal type digital filter 12 for performing filter processing on output data from the time-axis compressing converter 6 in which tap coefficient data beta k is switched at the cycle of 1/fn. The tap coefficient data is selected to nullify dummy data DK which periodically appears, based on impulse response data obtained by sampling a sampling function for the sampling frequency fm with a frequency of the least common multiple of the sampling frequencies fn and fm. |
