SU1427391A1 - Device for determining the sign of derivative - Google Patents

Abstract

The invention relates to computing. The purpose of the invention is to simplify the device and increase speed. The device contains a comparator 1, a sawtooth voltage generator 2, a pulse shaper 3, a pulse generator 4, the first trigger 5, a counter 6, the second trigger 7. The derivative sign is defined -. The state of the trigger is 5 ,. depending on whether the interval between two successive attempts of comparator 1 is larger or less than the sweep period. 1 Il.

Description

The invention relates to computer technology and can be used in control systems and in digital measuring devices. $

The purpose of the invention is to simplify the device and improve performance.

The drawing shows a diagram of the device. ·

The device comprises a comparator 1, a sawtooth voltage generator 2, an ed pulse shaper 3, a pulse generator, a first D-trigger 5, a counter 6, a second trigger 7.

The device operates as follows. fifteen

The input of the comparator 1 is fed the test signal, the sawtooth voltage is applied to the second input. The amplitude of the sawtooth voltage is selected obviously higher than the maximum possible level of the input signal. When the sawtooth voltage exceeds the input signal, the potential 1 appears at the output of the comparator 1. When the sawtooth voltage becomes less than 25 of the input signal, the potential 0 ”appears at the output of the comparator 1.

On the positive edge of the pulses from the output of the comparator 1, the shaper 3 pulses generates short ed pulses, which, entering the inputs of the installation at 0 of the counter 6 and the second trigger 7, reset them. Then the counter 6 goes into the counting mode. The frequency of the 4-pulse generator is selected so that the pulse appears at the output of the transfer of the counter 6 of the counter 6 after a time equal to the period T of the sawtooth voltage.

If the input signal increases, then the positive edge of the pulse at the output of the comparator 1 is separated from the positive edge of the preceding pulse by a time longer than the period of the sawtooth voltage. The pulse, formed by counter 6, by a recession, transfers trigger 7 to a single state. On the D-input of trigger 5 from the direct output of trigger 7, potential 1 will be received. On the positive edge of the pulse from the output of comparator 1, one will be written to the first trigger 50, since the second trigger 7 will not have time to zero due to the delay of the second trigger 7 and driver 3. Thus Thus, if the input signal increases, then the first trigger 5 is in a single state. If the input signal decreases, then the positive edge of the pulse at the output of the comparator 1 is separated from the positive edge of the previous pulse by a time shorter than the period of the sawtooth voltage. The pulse at the output of the transfer of the counter 6 does not occur, since the latter is reset to zero by the pulse from the output of the former 3. The trigger 7 will remain in the zero state, and on the positive edge of the pulse from the output of the comparator 1, the trigger 5 is brought to the zero state. Thus, if the input signal decreases,. then trigger 5 is in the zero state.

With a constant input signal due to the natural delay of the driver 3 and trigger 7, the functioning of the circuit occurs in the same way as in the case of a decrease in the input signal.

In the proposed device, the sign of the derivative of the input signal is measured every period T of the sawtooth voltage, both with increasing input signal and with its decrease, while in the prototype, when the input signal decreases for three periods? Sweep accounts for only two dimensions.

Claims (1)

Claim A device for determining the sign of a derivative containing a comparator, the first input of which is the information input of the device, and the second input is connected to the output of the sawtooth voltage generator, the first trigger, the output of which is the output of the device, a pulse generator, a counter and a second trigger, characterized in that, in order to simplify the device and improve performance, the device contains a pulse shaper, and the first trigger is made in the form of a D-trigger, the pulse generator is connected to the counter input of the counter, in the comparator output is connected to the synchronizing input of the first trigger and through the pulse shaper it is connected to the resetting input of the counter and to the setting input 0 of the second trigger, the setting input 1 of which is connected to the counter transfer output and the output to the D-input of the first trigger.