| 摘要 |
PROBLEM TO BE SOLVED: To provide a general purpose sampling rate conversion device that performs parallel conversion to a plurality of sampling rates in a small circuit scale and at a low cost.SOLUTION: Position coordinate difference calculation sections 5a-5c calculate position coordinate differences between position coordinates of a plurality of output digital signals and position coordinates of neighboring input digital signals. FIR coefficient memories 13a-13c save FIR coefficients of a FIR-LPF, and when the position coordinate differences are input, output FIR coefficients corresponding to position coordinate differences between the output digital signals and a fixed number of input digital signals present in neighborhoods of the position coordinates of the output digital signals. If the position coordinate differences corresponding to two or more different output digital signals, respectively, are calculated simultaneously, a control section 11 supplies the group of FIR coefficients and the group of input digital signals corresponding to the position coordinate differences, respectively, to a parallel FIR computing element 4 in a predetermined order. The parallel FIR computing element 4 performs a FIR-LPF interpolation operation using them to calculate the output digital signals. |
