| 摘要 |
Apparatus for multiplying analog electrical quantities comprises an integrator, such as a Miller integrator, to whose input can be selectively applied two or more electrical quantities, in the form of positive voltages, or a reference voltage, which is a negative voltage. The output of the integrator is connected to a signal range indicator whose output is connected to the inverted input of an OR gate and to a logical control circuit connected to the output of a start generator. The logical control circuit is connected to the non-inverted input of the OR gate, and the OR gate is connected to one input of an AND gate whose other input has connected thereto a post generator. The output of the AND gate is connected to a counter whose counting direction is controlled by the logical control circuit, and the counter-output is connected to a digital indicator. To multiply the analog electrical quantities, the logical control circuit is activated to apply the first electrical quantity to the integrator and simultaneously to open the AND gate for transmission of a predetermined number of pulses from the pulse generator to the counter counting in the forward direction. After counting of the predetermined number of pulses, the first electrical quantity is disconnected at a first given time and the reference voltage is applied to the integrator while resetting the counter toward zero, until the voltage at the integrator output is zero at a second time. The reference voltage is then disconnected and a second electrical quantity is applied to the integrator while pulses are transmitted to the counter which is still counting in the backward direction, until the counter reading is zero. When the counter reading is zero, the second electrical quantity is disconnected at a third given time, the counter is set to count in the forward direction and the reference voltage is again applied to the integrator while the pulses are transmitted to the counter. The pulse count is then continued until the integrator output voltage is again zero.
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