SU434410A1 - DEVICE FOR DETERMINATION OF TWO NUMBERS - Google Patents

Description

one

The invention relates to the field of automation and telemechanics, and is intended for automatic monitoring and control systems.

Devices for determining the difference of two numbers are known, comprising a pulse generator, counters, AND, OR logic circuits and triggers with separate inputs.

Such devices are relatively complex due to the use of a large number of AND, OR, and triggering logic circuits.

The aim of the invention is to simplify the device.

The proposed device is characterized in that it contains a counting trigger, the zero input of which is connected to the zero trigger input with separate inputs, and the counting input with the output of the OR circuit, the inputs of which are connected respectively to the outputs of the first and second counters, and the single output of the trigger trigger is connected with a single trigger input with separate inputs and with the first input of the second circuit And, the second input of which is connected to the pulse generator, and the output to the output bar of the device, and the output of the first circuit And connected to the counting inputs s counters.

The drawing shows a diagram of the proposed device for determining the difference of two numbers.

It includes the generator 1 counting pulses, the first counter 2, the second counter 3, the input circuit AND 4, the output circuit AND 5, the circuit OR 6, the trigger 7 with the counting input, the trigger 8 with separate inputs, the bus 9 records the first number, the bus 10 records the second number.

The operation of the circuit is as follows.

For definiteness, we assume that the number 10 write pulse to the write bus 10 comes either simultaneously with the number write pulse to bus 9, or later.

The write pulse from bus 9 enters the first number into counter 2, and the write pulse from bus 10 writes the second number into counter 3, at the same time producing a trigger 7 with a counting input and a trigger 8 with separate inputs.

In this case, a trigger with a counting input is set to such a state that it prohibits the passage of counting pulses through an AND 5 circuit, and a trigger with separate inputs is set to such a position that it allows the passage of counting pulses through an And 4 input circuit.

Counting pulses from the output of circuit 4 are fed to the inputs of counters 2 and 3.

After both counters overflow (or are zeroed, which is indifferent for the device), the output of the circuit OR 6

Four overflow pulses appear, and the number of counting pulses from the output of generator 1, which is placed between these pulses, is equal to the difference of the two numbers being compared. Two pulses from the output of the circuit P1LI 6 pass to the counting input of the trigger 7. The first pulse from the output of the circuit OR 6 transfers the trigger 7 to a position that allows the passage of the counting pulses through the circuit AND 5, and the second pulse from the output of the circuit OR 6 overturns the trigger 7 with a counting input to a state in which the passage of pulses through an AND 5 circuit is prohibited.

With its falling edge, the strobe from the output of trigger 7 overturns trigger 8 with separate inputs, prohibiting the passage of pulses through an AND 4 circuit.

Thus, from the output of the AND 5 circuit, we have pulses whose number is equal to the difference between the two numbers being copied, and in the counter that overflowed earlier (this corresponds to the fact that it contained a larger number) the parallel code of the difference of two numbers is recorded.

If we assume that counter 2 is the counter to be decremented, and counter 3 is the counter of the deductible, then the "positive sign of the difference corresponds to that, then the first counter overflows 2 and the difference is written in the parallel code in the counter to be decremented. If the first is an overflow pulse from the output of the deductible counter, then the difference of numbers in the parallel code is written into the counter of the deductible and this corresponds to a "negative sign of the difference."

If the compared numbers arriving at the counters are equal, the overflow pulses from the counter outputs coincide in time.

In this case, at the output of the OR 6 circuit, a second overflow pulse appears after

when counters 2 and 3 are zeroed after the first overflow, they calculate the number of pulses equal to their maximum capacitance plus a neg. impulse pulse.

Thus, the number of pulses at the output of the circuit And 5 in the case of equality of the compared numbers is equal to the maximum capacity of the counter plus the overflow pulse, the simultaneous appearance of repetitive pulses from the outputs of the counters 2, 3 indicates the absence of a sign (or the simultaneous presence of a plus, minus sign) zero difference, and in the parallel code in the counters 2, 3 the bullet difference is recorded.

Subject invention

Device for determining the difference of two

numbers, containing a pulse generator connected to the first input of the first circuit And, the second input of which is connected to the zero output of the trigger with separate inputs, the zero input of which is connected to the recording bus of the second number, the first and second counters, the installation inputs of which are connected respectively to the recording buses of the first and the second number, the second AND circuit and the OR circuit, characterized in that, for the purpose of simplification, it contains a counting trigger, the zero input of which is connected to the zero input of a trigger with separate inputs, and the counting input - Exit OR circuit, whose inputs are linked respectively to the outputs

the first and second counters, moreover, a single output of the counting trigger is connected to a single trigger input with separate inputs and to the first input of the second circuit, And the second input of which is connected to the pulse generator, and the output to the output bus of the device, and the output of the nerve circuit And connected to counting inputs counters.