SU660049A1 - Multiplying arrangement - Google Patents

Description

the second factor, one of the inputs of which is connected to the output of counter 1, and the second of the inputs is connected to the input of counter 2, block 4 multiplying the second factor by a unit increment of the first factor, one of the inputs of which is connected to the output of counter 2, delay element 5, the input of which connected to the input of the counter 1, and the output of which is connected to another input of the multiplication unit 4, the element OR 6, whose inputs are connected to the outputs of the multiplication blocks 3 and 4, the adder 7, whose input is connected to the output of the element OR 6, the counter 8 of the result, the input to expensively connected to the output of the adder 7.

The device works as follows.

Before starting the calculations, the initial values of the nerve and second factors are entered into the counter 1 and counter 2, the younger and the oldest l-bits of the exact value of the production, respectively, into the output adder 7 and the counter 8 of the result. At the inputs of counters 1 and 2, simultaneously; they post, respectively, on increments of Hell; and Dg / representing short short pulses.

Fundamentally, the circuits of counters 1 and 2 are designed in such a way that the change in the state of the counters takes place on the falling edge of the counting signals Ax and At, (which, for example, is carried out in counters performed on the integral elements of the 155 series).

Thus, the states of the counters remain unchanged during the action of the signals Al and Ar. Blocks of multiplication 3 and 4 are triggered but the leading edge of the signals A.-H and Ar /. Therefore, at the time of arrival of signals and Ar / only at the output of multiplication unit 3, a signal appears that is fed through circuit 6 to the input of adder 7, overflows from the output of which are fed to the input of counter 8, which are summed with its contents xy.

At the output of multiplier 4, the signal of the product g / -Al is absent, which is due to the absence at this moment of time at the input of block 4 of the signal A.X. delayed by the delay element 5. The condition that the delay time τ introduced by the delay element 5 is equal to

,,

where T4 is the pulse duration Ax and Ar /; T is the maximum transient time in the meter circuit.

Further, the pulses Al - and Ar / end, the states of the counters x and y / change and become respectively equal to x +, g / + Ar /. Now at the output of the multiplier

after the delayed signal arrives at its input 9, the value (g / + Ar /) Al is formed. Pa output of block 3, the value of the product is absent due to the absence of the signal At / at input 10.

The value (g / + Ar /) - Al: enters through the element OR 6 to the input of the adder 7, from the output of which the overflow enters the input of the counter 8. The value that is ultimately formed in the adder 7 and the counter 8 is nothing else as an exact value of the product of input values equal to

(l: + Dl:) (g / + Dg /); sg / + g / -Ll: + Dg / -. l: 4-D.x-Lg /

Claims (2)

1. USSR author's certificate number 432525, cl. G 06G 7/16, 1972. 2. Peslukhovsky KS Digital differential analyzers. M., “Mechanical Engineering, 1968, p. 90. IS M X