| 摘要 |
PROBLEM TO BE SOLVED: To accelerate operation without expanding the scale of a hardware. SOLUTION: A FIFO 20 stores inputted data Din according to a write address supplied from a read/write counter 21 and outputs the stored data according to a read address. An O/S (over sampling) coefficient designation/interpolation ratio generation part 23 calculates COE A and COE B (actually only the COE A as the set of coefficients for finding two over sampling points A and B required for finding the value of an interpolating point) for over sampling and linear interpolation, and also calculates an interpolation ratio while considering over sampling. According to the said coefficient set COE A and the interpolation ratio considering the over sampling, an 8-times over sampling/linear interpolating part 24 converts the sampling frequency of input data Din through linear interpolation and convolving operation without two producers, i.e., over sampling and linear interpolation. |
