| 摘要 |
A continuous analog signal is produced by successively generating digital data VK (K=. . . , -4, -3, -2, -1, 0, 1, 2, 3, . . . ) every predetermined sampling period T, repeatedly generating, successively at a period 3T, signals phi (t+T), phi (t), phi (t-T), where a unit pulse response signal psi (t) is expressed by psi (t)= SIGMA AKx phi (t-KxT) (K=- INFINITY DIFFERENCE + INFINITY ) using a signal phi (t) (0</=t</=3xT) expressed by three piecewise polynomials, computing C in accordance with the equation C= SIGMA A-KxVK (K=-M DIFFERENCE m) every sampling period T, where V0 represents digital data prevailing at the present time, cyclically storing the results of computation as C-1, C0, C1 in successive fashion, and converting the digital data into an analog quantity in accordance with the equation C-1x phi (t+T)+C2x phi (t)+C3x phi (t-T) |
