| 摘要 |
PURPOSE:To obtain a noise, by summing up the output of a noise generator and those of waveform generators through filters, amplifiers, and analog switches, and bringing the gains of the amplifiers and the timing of the switches under the control of a microcomputer. CONSTITUTION:The outputs of the waveform generators 11-1N are inputted to an adder 6 through variable band filters 311-31N, variable gain amplifiers 411- 41N, and analog switches 511-51N. The output of a white Gaussian noise source 21 is divided into P pieces (P; 1, 2..., natural number), which are inputted to the adder 6 through variable band filters 321-32P, variable gain amplifiers 421- 42P, and analog switches 521-52P. A noise source 2M is the same and not described there. Thus, the adder 6 inputs the respective outputs and sums up them and the sum output is passed through an amplifier 7 to obtain a noise waveform at an output terminal 8. The selection of the frequency bands of the filters 7, the setting of the gains of the amplifiers, and the selection of the timing of the switches are controlled by the microcomputer according to a prescribed program. |
