RU1772892C - Time-to-number converter - Google Patents

Abstract

The invention relates to computing and measuring technology and can be used in automatic control systems in information collection and processing devices. The aim of the invention is to increase speed by reducing the variance of the time interval between the Start signal and the start of conversion. This goal is achieved in that an N-clock pulse network is formed from the converted signal, from which a pulse sequence is selected that is closest in phase to the Start signal. The converter contains a pulse former, groups of first and second delay elements, N circuits I and N triggers, the first and N second elements OR, digital periodomer-frequency meter. 2 ill.

Description

The invention relates to computing and measuring equipment and can be used in automatic control systems, in information collection and processing devices.

The purpose of the invention is to increase reliability by reducing the variance of the time interval between the signal at the start of the conversion.

In FIG. 1 shows a diagram of the device, in FIG. 2 are timing diagrams explaining the principle of operation of the device.

The period-code converter contains a pulse shaper 1, the input of which is an input bus, a digital periodomer-frequency meter 2, whose control input is combined with the control input of the switch and is the Start bus, and the output is an output bus, a switch containing N elements And 3-1.3-2, .. ,, 3-N, delay line 4, N triggers 5-1.52, ..., 5-N, N delay elements 6-1.6-26-- N, (N + 1) -u element OR 7, N elements OR 8-1.8-28-N.

The input of each of the N delay elements 6 is combined with the installation input to the unit of the corresponding trigger 6 and connected to the output of the corresponding element And 3, the first input of the first of which is the input of the switch and combined with the input of the delay line 4, the outputs from the first to (N-1 ) -u of which are connected to the first inputs of the AND 3 elements from the second to the Nth, respectively, the first inputs of the And 3 elements are connected to the outputs of the corresponding elements OR 8, the first inputs of which are combined and are the control input of the switch, and the second inputs are connected us with straight outputs corresponding trigger 5, the input setting to zero which are combined and connected converting digital output End pesl

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the frequency meter 2, and the inverse output of each 1st trigger 5, where &1; N is connected to the (+2) -th input of each subsequent element And 3 and (I-1) -th input of each previous element And 3, while the outputs of the delay elements 6 are connected to the corresponding inputs of the (N + 1) -ro element OR 7 .

The period-to-code converter operates as follows.

In the initial state, the triggers 5 are in a state of logical zero, the driver 1 generates rectangular pulses fx- | from the input harmonic signal fx (Figs. 2a, b), the duration of which corresponds to the propagation delay time of the signals in the triggers of the digital periodometer-frequency meter 2 and in the triggers 5, At the first inputs of the And 3 elements there is an N-clock pulse network fxi, fX2. -, fxN (Fig. 26, d), formed from the signals of the driver 1 using the delay line 4, however, before the start signal arrives, the operation of the device is prohibited.

At the Start signal, the digital perimeter-frequency meter 2 is initially set up and the enable signal appears at the second inputs of the AND 3 elements from the output of the corresponding OR 8 elements (Fig. 2e). The pulse of one of the generated sequences closest to the phase of the Start signal passes to the output of a certain And 3 element and, after an IT time corresponding to the propagation delay of the signal in the trigger, sets the corresponding trigger 5 to the single state (Fig. 2f). At the same time, only one trigger 5 can trigger at the moment of the start signal, in this case trigger 5-2 (Fig. 2f), since the pulse duration allocated by AND 3-1 will not be enough to trigger 5-1. The signal from the inverse output of the triggered trigger goes to the corresponding inputs of the remaining elements I. prohibiting the passage of the remaining pulse sequences to the inputs of the corresponding elements I. At the end of the Start signal, the potential from the direct output of the triggered trigger 5 through the corresponding element OR 8 maintains the corresponding element And 3 in the open state the second input, the pulse sequence is thus selected through the corresponding delay element b (with delay time tr) and the OR element 7 fed to the input of the digital periodometer-frequency counter 2. At the end

the measuring cycle by the trailing edge of the signal from the output of the controlled trigger of the digital periodometer-frequency meter, the triggered trigger 5 is set to a logical zero state, preparing the device for an alternating conversion cycle. The minimum allowable shift between the generated pulse sequences and, accordingly, their number

0 is determined by the duration of the Start signal and is selected to exclude the operation of more than one trigger 5.

The invention makes it possible to reduce the variance of the time interval between the Start signal and the start of the Tz conversion to the value of Tz / N, where N is the number of generated pulse sequences. The total TPR conversion time is also reduced to Tpr. Ts / N + + Tx.

0 Formula

The period-code converter, executed on the shaper, switch, and digital periodometer-frequency meter connected in series, controls

5, the input of which is combined with the control input of the switch and is the Start bus, and the output is the output bus, characterized in that, in order to increase speed by reducing the time interval between the Start signal and the start of conversion, the switch is made on N elements AND , (N 1) th OR element, N triggers, delay lines and N delay elements, input

5 of each of which is combined with the installation input in 1 of the corresponding trigger and connected to the output of the corresponding element AND, the first input of the first of which is the input of the switch and connected to the input of the delay line, the outputs of which are connected to the first (1M-1) -th with the first inputs of AND elements from the second to the Wth respectively, the second inputs of AND elements are connected to the outputs of the corresponding OR elements, the first inputs of which are combined and are the control input of the switch, and the second inputs are connected to the direct outputs of of the corresponding triggers, the inputs of the installation in which are combined and connected to the output End of conversion of the digital periodometer-frequency meter, and the inverse output of each 1st trigger, where ie {1, M, is connected to the (+2) -th input of each subsequent element5 And and the (1 + 1) -th input of each previous AND element, while the outputs of the delay elements are connected to the corresponding inputs of the (N + 1) -ro OR element, the output of which is the output of the switch.

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1772892

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