| 摘要 |
PURPOSE:To generate natural fluctuations by adding input data which is delayed by a delay circuit and input data which is not delayed together and generating fluctuation information. CONSTITUTION:A noise generator 11 generates random noises in synchronism with a clock phis and supplies them to an input terminal 1 of a selector 21. The selector 21 selects and outputs alternate data supplied to the input terminals 1 and 0 at intervals of one cycle of a clock phi whose period is a half as long as that of the phis. Then noise data that the selector 21 selects are supplied to one input of an adder 22 and also inputted to delay circuits 23 and 24 and they are delayed by one cycle of the clock phi and supplied to the other input of the adder 22. Therefore, noises with a flat spectrum become a spectrum which smoothly decreases corresponding to an increase in frequency. Consequently, natural fluctuations are obtained by the simple structure. |
