SU957166A1 - Time interval to code converter - Google Patents

Description

(54) TIME TRANSFORMER INTO CODE

The invention relates to a pulse and measurement technique and can be used to convert time intervals into a digital code. A device is known for measuring time intervals, containing its phase-shifting chains with elements AND connected to their outputs, connected with the second inputs to the register, and outputs through the OR element and AND element with the counter, as well as the first trigger connected in series And the second control trigger ij. The disadvantages of this device are the limited conversion accuracy and speed. The closest in technical essence to the invention is a time interval converter into a code containing a master oscillator and a unit for generating N time-shifted counting pulse sequences, including faero-shifting devices connected to the master oscillator and connected to them sequentially pulse shapers, outputs which, which are the outputs of the block, are connected to N series-connected ventilation meters and counters, to the outputs of which the keys an adder, the second large inputs to These valves are the inputs of the device 21. The disadvantage of the known device is the complexity of its hardware implementation, requiring the use of a myo-bit adder and N counters with a resolution of up to 20 or more bits. This limits the number of parallel channels to quasi N and the maximum achievable conversion accuracy. In addition to foro, the known device cannot be used spontaneously for multiple conversions into the code of the periodically following time intervals, which does not allow improving the accuracy of the conversion due to the averaging effect. 39S716 The purpose of the invention is to improve the conversion accuracy and reliability of the device. This goal is achieved by the fact that in the time interval converter 5 there is a code containing a master oscillator, a counter, a formatting unit of N shifted sequences of counting pulses, the outputs of which are connected to. The respective inputs of the corresponding time O selectors, the second inputs of which are combined and connected to the input bus, have entered the pulse sequence combining unit, the time master unit, the coincidence element, and the coupling starter 13, the output of the master oscillator is connected to the first inputs the time of the master block and the item matches. the output of which is connected to the input of the block of formation of N shifted successive-ao ngay I counting pulses i and the input of the forcing pulse generator, the first and second outputs of which are connected respectively to the first and second groups of inputs of the combining pulsed sequence of 25 sequences, the information inputs of which are connected to the outputs of the corresponding time selectors, and the output to the input of the counter, the second input of the coincidence element is connected to the output. m time master unit, the second input of which is connected to the input bus. The unit for combining impulse sequences contains (sequentially, connected transforms GGRGK ITT about 1 RI N t 2. p H 2, raeto j N is the whole part of the number enclosed in brackets; N is the number of shifted sequences arriving at information ° C; 45 P - integer: P “1, 2, 3, ..., N) the output of the last of which is the output of the block, the first and second inputs of which are the combined first and second corresponding inputs of the transform stages, and information inputs of the first stage of transformation They are the information inputs of the Unite and Pulse Pospetschatelvos® 64 block. In addition, each of the conversion stages contains H1 counting triggers (mJ (P odd number of step inputs, CO, even if the step inputs are even) and g identical / 21 conversion cells). 6i.i + -) / 2 at i h, where 4 is the number of the step) conversion), where the first and the second inputs of the stage are connected to the first and second synchronous inputs, respectively, of the conversion cell, each of the two counting inputs is connected to one of the information inputs The outputs of the cells are outputs of the conversion stage. Each conversion cell contains two countable triggers, two O-triggers and an EXCLUSIVE 11 EER OR element, and the inputs of the counting triggers are the counting inputs of the cell, the C inputs of the first and second D triggers are, respectively, the first M and the second sync rods , the outputs of the first and second counting flip-flops are connected to D -input respectively of the first and second p-triggers, the outputs of which through the element EXCLUDING OR OR connected to the outputs of the cell. FIG. 1 psjazana converter circuit; in fig. 2 - time diagrams illustrating his work. The time interval to code converter contains the following: 1 sdn # forming time sequences of counting pulses, time selectors 2 connected to it, master oscillator 3, time alternating block 4, coincidence element 5 connected to block 1 forming sequences of time-shifted countable of pulses and a shaper of anchoring pulses 6, connected to an impedance sequence combining pulse 7, containing K serially connected conversion steps 8, each step includes counting trigger 9 2 n identical cells 10 convert each of which comprises two counting flip-flop 11 and 12, element 13 excluded. OR and two D-trigger 14 and 15, the output of block 7 is connected to the input of the counter 16. The device works as follows. The rectangular impulses are consistent with the transformed time intervals, and arrive at the combined inputs.

5.95

jij time selectors 2, where, during the measurement time specified by time given by block 4 and a multiple of the integer number of periods of the signal P, they are parallelly quantized by block 1 shifted by (1 –1) to / N sequences of counting pulses, with a period of i. The formed bursts of pulses go to the first stage 8 of the pulsed sequence combining unit 7 (Fig. 2c, d), where the counting pulses are tied to two pulse-shifted shifts from the output of the former 6 (Fig. 2a, b) pulses of anchors and their pairwise merging with the help of elements 13 EXCLUSIVE OR (Fig. 2, and). FIG. 2 d, e shows the pulses at the outputs of the first and second counting triggers, respectively; FIG. 2 g, s shows the signals at the inputs of the EXCLUSIVE OR element.

Similarly, in subsequent stages, the binding and integration of the output sequences of the previous stages occurs. As a result, at the output of the combining unit 7 of the pulse sequences, counting pulses are generated with the frequency of the master oscillator 3. Which then can be directly recorded by the total summing counter 16. The required number of stages is determined by the ratio N 2 and N by N-2, and the number The GP of counting flip-flops 9 is equal to O with an even number of step inputs and 1 with an odd number of step inputs; the number of conversion cells for the first stage is R / C, K / 2, and for the h stage, rn, -,) / 2, where (e, -., t, -. / 2 is a fraction of the number enclosed in brackets.

So, at And 10, With 5,

e2 2; t2 1; ez 1; tz; P4 1.

(Sc is always zero). Thus, even with a large number of parallel quantization channels, the pulse sequence combining unit contains a small number of discrete elements |

-Tows-Consequently, by introducing new elements and connections, it is possible to convert into the code periodically the next time intervals of arbitrary duration, which allows to increase the accuracy of the conversion by statistically averaging the results, multiple measurements and expanding the functional capabilities of the converter.

6

At the same time, registration of very short time (1o / N) counting pulses from the outputs of the time selectors is achieved by simpler and, therefore, more reliable means than in the known device, which in this case requires the use of multi-bit counters and a multi-bit accumulating adder. This in turn makes it possible to increase the number of parallel quantization channels and improve the accuracy of the conversion.

Pulse sequence combining unit 7 is made of standard elementary cells, which is very convenient from the point of view of technology and the design of the block implementation.

and invention

Formulas

Claims (4)

1. The converter of time intervals into the code containing the order of the generator, counter, block Ы of the shifted aftertreatments of the counting pulses, the outputs of which are connected to the first inputs of the corresponding time selectors, the second inputs of which are combined and connected to the input bus, different in order. that, with increased accuracy of conversion and reliable device, a block & pulse sequence sequence was entered into it, the time was delayed. the block, the element coincident In the driver of the coupling pulses, just the output of the master oscillator connected to the first inputs of the master block and ep & summer connected, the output of which is connected to the input of the unit of the formation of shifted sequences of counting pulses and the input of the generator of pulse multipliers, the first to the second outputs are connected to the first one in watts The groups of inputs of the pulse sequence combining unit whose information inputs are connected to the outputs of the corresponding time selectors and the output to the counter input, the second input of the coincidence element is connected to the output of the master time whose second input is connected to the input joint. 2. The interpreter of claim 1, wherein the unit combining pulse sequences contains To consistently connected. steps transform nv / +1 prv nx ° anan: prv N - 2 rfletodjW- is the whole number, enclosed in brackets; M - the number of shifted sequences arriving at the ikoforpionnye inputs of the block; L is an integer, P 1, 2, 3 .... N), the output of the last of which is the output of the block, the first and second groups of inputs of which are combined by the first and second respectively the inputs of the conversion stages, and the information inputs of the first conversion steps are informational sections of the pulse sequence combining unit. 3. Converter on PP. 1 and 2, characterized in that each of the conversion steps contains lH countable triggers G 1 with an odd number of inputs 1 t I level q About. with an even number of inputs stu neHif and 6j identically transform cells (p. H, H / 2 at 1   I at 4. where is the number of the conversion stage, the first and second inputs of the stage are connected to the first and second synchronization inputs, respectively, of the transformation cell, each of two counting inputs of which are connected to one of the information inputs of the conversion stage, the outputs of the cells are the outputs of the conversion stage 4. Converter for .pp. 1, 2 and 3, differing in that the transformation cell contains two counting flip-flops, two D-flip-flops and an EXCLUSIVE OR element, and the inputs of the counting flip-flops are counting inputs of the cell, the C-inputs of the first and second triggers are the first and second sync inputs, respectively. the cells, the outputs of the first and second counting triggers are connected to the D-inputs, respectively, of the first and second D-terminals, the outputs of which through the EXCLUSIVE OR element are connected to the outputs of the cell. Sources of information taken into account in the examination 1. USSR author's certificate number 558261, cl. q 04 F 1O / O4, 1977. 2. USSR author's certificate number 172354, cl. Q 04 f 10 / O4, 1965. fug. g