| 摘要 |
An electronic arrangement for generating, from a reference value proportional to the rate of movement, for example, from an a.c. voltage generated by a means of a tachometer generator, two a.c. voltages which can be shifted in phase with respect to each other by a constant frequency-independent amount. An arrangement is provided in which a variable input a.c. voltage is changed to a triangular voltage of constant amplitude and proportional in frequency to the a.c. voltage. There is a first square-wave voltage derived from the triangular voltage and the triangular voltage is inverted. The inverted and uninverted triangular voltage are each applied to one input of two comparators and a manually variable d.c. voltage is applied to the second input of each comparator. The d.c. voltage is manually variable between the maximum and minimum amplitudes of the triangular voltage. The outputs of the two comparators are connected to a bistable multivibrator which generates a second square-wave voltage shiftable in phase by the angle psi with respect to the first square-wave voltage by varying the d.c. voltage. |
