SU898382A2 - Time interval series meter - Google Patents

Description

(54) MEASURING SERIES OF TIME INTERVALS

one

The invention relates to electrical measurements, and can be used to measure and store a series of consecutive random or pseudo-random time intervals.

According to the main author. St. No. 538334 is known for measuring a series of time intervals, containing a generator of a reference frequency pulses, connected in series through a key with a counting input of a counter, the output of which is the first bit through a line. . the delays are connected to the input of the second key, the expander, the output of which is connected to the input of the third key, the second delay line, the storage unit and the trigger connected in series, the fourth key and the driver-output of which is connected to the second input of the second key, and with the first input of the trigger, the second input of which is connected to the output of the third patch, the second input of the third key is connected to the output of the second delay line, the input of which is connected to the output of the reference frequency generator, connecting chennym also to the second latch output is coupled to a second input of the first switch, a second output connected to an input kl№cha first discharge memory device, and inputs the remaining bits of the storage device directly connected to the respective outputs of the counter 1.

ten

A disadvantage of this device is the low reliability of the measurement results when it is operating under conditions of a priori uncertainty about the duration and number of measured time intervals. Since the device is intended to measure random time intervals, it is not possible to predict in advance the expected duration and number of measurable intervals, which leads to the appearance of gross errors caused by overflow of the counter upon receipt of relatively long intervals and 25 time intervals / arising from an overflow of a storage unit. The presence of proton errors negatively affects the quality of the subsequent analogue of the random and pseudo-random sequences formed by the measured time intervals.

The purpose of the invention is to increase the reliability of measurement results.

The goal is achieved by the fact that three AND logic gates, two AND-NOT gates, an OR-NOT element and an inverter are inserted into the series time meter, and the second trigger output is connected to the first input of the first AND element, the output of which is connected to the second input of the First key, the driver output is connected to the first input of the second element I, the output of which is connected to the second input of the second key, the outputs of all bits of the counter through the first element AND are NOT connected to the second input of the first element I, the output of the The cable is connected to the first input of the third element I, whose input is connected to the output of the second element rf-I-HE, and the output to the second input of the third key, all the outputs of the storage unit are connected to the inputs of the element OR-IE, whose input is connected to the second input the second key directly and through the inverter - with the first input of the second NAND element, the second input of which is connected to the first output of the trigger.

On the flowchart of the device.

The device contains the generator 1, the impulses of the reference frequency, the key 2, the counter 3, the delay line 4, the logical element 5 AND, the delay line 6 the logical element 7 AND-IE, the key 8 trigger 9, the logical element 10 AND, the key. 11, a logical element, 12 And, a logical element 13, a key 14, a driver 15, a storage unit 16, an expander 17 of the input pulses, an inverter 18, a logical element 19 OR NONE.

The output of the pulse generator 1 is connected to the inputs of the delay line 4 and the keys 2 and 14. The output of the delay line 4 is connected via a switch 8 to the input of the zero setting of the trigger 9. The second input of the switch 8 Through the logic element 12 And connected to the output of the expander 17, whose input input device. The key of key 2 is connected to the counting input of counter 3, the second input of key 2 through logic element 5 AND is connected to the forward output of trigger 9. The outputs of all bits of counter 3 are connected to the inputs of logical element 7 AND-NOT, the output of which is connected to the second input of element 5 I. First exit

, counter 3 through the delay line b and the key 11 is connected to the input of the first bit of the first storage line

 block 16, and the remaining outputs of the counter 3 are connected directly to the inputs of the corresponding bits. the first row of the storage unit 16. The outputs of all bits of the last row of the storage unit 16 are connected to the corresponding inputs of the logical element 19 OR NOT, the output of which is connected to the input of the element 10 AND, and through the series-connected inverter 18 and element 13 AND-NOT - to the second input of the element 12 I. Inver

Q sny output trigger 9 is connected to the inputs of the element 13 I.NE and the key 14, the output of which is connected to the input of the imaging device 15. The output of the imaging device 15 through the element 10 and is connected to the input of the installation of a single state

5 flip-flops 9, key 11, and inputs for reading information and resetting the counter 3.

The operation of the proposed device 0 when short is received at its input: time intervals that do not cause overflow of counter 3, as well as with the number of such intervals smaller than the capacity of the storage unit 16, do not. differs from the operation of the known device, since elements 5, 10,

12 And - open, and at the outputs of elements 7 AND-NOT and 19 ILK-NOT - high potential d. ,

0 When measuring d: italnyh interval. the time when in all bits of counter 3 appears, the element 7 IgnE is triggered, and at its output a zero potential appears,

5 which leads to the closing of the element. 1 5. And, the output signal of which, fe OWN, turns off key 2, which leads to the termination of the arrival of the counting pulses from generator 1 to

e to counter 3. Thus, the maximum possible number of counting pulses 2 is recorded in the counter, where k is the number of bits of counter 3, which indicates that an interval of ut /

5 (.х, g where T is the period of the following counting pulses of the generator 1. Klyuy 2 is open until the measured interval ends, i.e. until the next measurement pulse arrives at the input of the device, which acts on the expander 17, element 12 I, the key 8, sets the trigger .9 to the - zero state. In this case, the inverse output of the trigger 9po is the unit potential that opens the key 14. The nearest counting pulse through the key 14 will act on the driver 15 triggers element 10 AND,

0 since at its second input a unit potential is maintained by element 19 OR NONE. The output pulse of the element 10 reads information from the counter 3 (the work of the delayed line b

5 and the key 11 is similar to their operation in a known device) in block 16 and it delays the trigger 9 into a single unit. In this case, a single potential appears at the direct output of flip-flop 9, which, through element 5, closes key 2 and ensures the start of counting of the next time interval. Element 5 And at this time is already in the unit state, since a single potential is supplied to its second input from the output of element 7 AND –NE (reading of information from all bits of counter 3 by this time has already been made, and at all outputs the potential will be zero). In this way, gross errors associated with overflow of counter 3 are eliminated, when instead of a long interval of time a short interval can be recorded, since after overflow counter 3 is zeroed and starts counting from the beginning. The error due to Sa that the true value of the measured interval can be greater than the maximum value recorded by the counter in the analysis of random processes plays a less significant role than in the known device. In addition, an error in the proposed device can always be detected when analyzing the measurement results and is eliminated in the next measurement cycle by increasing the tracking time of the counting pulses, which is impossible in a known device. When analyzing random (including noise) processes, it is often required to obtain a sample of consecutive time intervals, beginning with a certain moment. This moment of time can be the moment of switching on, of this device or device connected to its input. The end of measurement is determined by the arrival of the value of the first. and the measured interval in the last row of block 16. At the same time, element 19 OR-NOT triggers the appearance of at least ONE H in any of the patterns of the last line of block 16. At the output of element 19 OR-NO, there is a zero potential, which through element 10 And prohibits reading information from counter 3 and setting trigger 9 to one after the last time interval, the value of which is measured completely. This is ensured by the fact that zero potential from the output of element 19 is also NOT fed through inverter 16 to element 13NAND, the second input of which is connected to the inverse output of the trigger 9. Therefore, the measurement of the last interval continues until its end, until the last measuring pulse through the expander 17, element 12 And the key B does not establish the trigger & to zero state. In the counter 3, the measured value of this interval remains, since its reading in the storage unit 16 does not occur due to the presence of a zero potential at the second input of the element 10 I. Simultaneously; the appearance of a single potential at the inverse output of the trigger 9 leads to the appearance of a zero potential at the output of the element 13 AND-NOT, which eliminates the possibility of impact through the key 8 on the trigger 9 from the side of the expander 17 until the information with the block 16 and counter 3. After this, the output of element 19 -OR-NO appears a single potential, which opens element 10 AND and closes element 13 AND-NOT. The closest in time to this point is the counting pulse of the generator 1 through the key 14, the driver 15 and the element 10 And the trigger 9 is set to one and. 1b prepares the meter for subsequent work. .Element 12 And at this time it is already opened by a signal from the output of the element: that 13 AND-NOT. Thus, the proposed meter captures and memorizes m + 1 consecutive time intervals, starting with a given reading moment, where m is the capacity of the storage unit. If the duration of the measured intervals, the time exceeds the value, well, then in the storage unit 16 the maximum number 2 is fixed, the invention of the meter of a series of time intervals according to the author. St. 538334, of those who want to improve the reliability of the results. measurements, it introduced three elements AND, two elements NAND, element OR NONE and an inverter, with the second output of the trigger connected to the first input of the first element AND whose output is connected to the second input of the first key, the output of the driver is connected to the first input of the second element And, the output of which is connected to the second input of the second key, the outputs of all bits of the counter through the first element AND are NOT connected to the second input of the first element AND, the expander output is connected to the first input of the third element AND, the second input of which is connected to you the second element is AND-NOT, and the output is with the second input of the third key, all the outputs of the memory block are connected to the inputs of the OR-NOT element, the output of which is connected to the second input of the second key

directly and through the inverter - with the first input of the second NAND element, the second input of which is connected to the first output of the trigger.

Sources of information taken into account in the examination

1. USSR author's certificate No. 5338334, C. 04 F10 / 04, IStS (prototype)

Claims (1)

Claim The measuring instrument of a series of time intervals by ed. St. "538334, characterized in that, in order to increase the reliability of the results .. measurements, three elements AND, two elements AND, NOT elements, element ₀ OR-HE inverter are introduced into it, the second output of the trigger connected to the first input of the first element AND, the output of which is connected to the second input of the first key, the output of the driver is connected to the first input of the second element And, the output of which is connected to the second input of the second key, the outputs of all bits of the counter through the first element AND are NOT connected to the second input of the first element And, the output of the expander is connected with the first input of the third AND element, the second input of which is connected to the output of the second AND-NOT element, and the output is with the second input of the third key, all the outputs of the storage unit are connected to the inputs of the OR-HE element, the output of which is connected to the second input of the second key directly and through the inverter - with the first input of the second AND-NOT element, the second input of which is connected to the first output of the trigger.