| 摘要 |
PURPOSE:To calculate short time power with a small amount of operation by calculating the short time power of the present hour in a main calculation part, integrating the square value of signals at respective hours in a sub- calculation part and replacing the short time power of the main calculation part with the calculation result obtained in the sub-calculation part. CONSTITUTION:The signal X(K) is inputted to the main calculation part 1 and the sub-calculation part 2, and respective parts calculate the short time power P(K) and an integration value Q(K) respectively, and a counter 3 transfers a count value ic to a control part 4 also. The control part 4 judges whether or not the count value ic becomes an L, that is, whether or not operation of L times are performed after the integration value Q(K) of the sub-calculation part 2 is reset. Then, the control part 4 issues a transfer instruction and a reset signal to the sub-calculation part 2 when the part 4 detects that the count value ic becomes the L, and transfers the integration value Q(K) of the sub- calculation part 2 to the main calculation part 1, and replaces the short time power P(K) with the integration value Q(K), and resets the count value ic and the integration value Q(K) to zero. |
