SU940128A1 - Device for determining confidence intervals - Google Patents

Description

one

The invention relates to a reference measurement technique, may be used for experimental studies of random and deterministic processes, and is intended to determine intervals in which a controlled process is found with a predetermined probability.

A digital voltmeter drift meter is known, consisting of a reference voltage source, a summing circuit, a pulse generator, a code comparison node, a frequency divider, two converters of impulses into voltages, two threshold elements, a reversible counter voltage converter, a voltage divider and self-spinning voltmeter. The operation of the meter is based on the infra-low frequency component from the spectrum of the input signal 1.

The disadvantage of the device is a poor accuracy.

A device for measuring confidence intervals, designed to control an ADC, consists of a reference voltage source, a voltage summation node, a comparison code node, a commutator, controlled double-counter meters, a register, a reversible counter, a code-voltage converter, polarity switch, voltage divider, self-voltage voltmeter, voltage generator and frequency divider 21.

The disadvantage of the device is also low accuracy.

The closest in technical essence to the present invention is a device for measuring the frequency of occurrence of signals of a certain level, which defines a half of the confidence interval of the input process and contains a comparison unit, valves, a weight addition function setting unit, a subtraction weight function setting unit, a total result calculation unit, external generator the direct output of the comparison unit through the valve is connected to the input of the setter of the weight functional complex, and the inverse through the other gate to the input of the setter of the weight function, the output of one setter, is connected to the total output, the output of which is connected to the forward input of the unit is comparative and is the output of the device, the bus of the external pulse generator is connected to the enabling inputs of the FGG. . The disadvantages of this device are limited capabilities and low accuracy, and these disadvantages are interrelated. The device determines the FLOOR of the range of the trusted interval. This limits its ability to control only centered processes with a symmetric distribution law. The purpose of the Te1Sh images is to increase accuracy and expand functional capabilities. The goal is achieved by the fact that in: a unit containing a block is equivalent, two valves permitting the inputs of which are connected to the output of the pulse generator, the setpoint weight subtractor and the subtracting weight function and the total result calculator, and the direct input is comparing the comparison so1 -schine with the output of the total total calculating unit, the first valve through the preset of the weight function of the addition is connected to the sumrating input of the total amount calculator, the output of the second valve through the setpoint weighting function is connected to the calculus to the input input of the total calculation unit, additionally a summation block, a comparison block, two ELECTIONS OR, an element NOT, an inverter, an increment detector and a CM cmce unit, one input of the summation block is an input of the device, the output of the summation block is connected to the shift input the main line Kfy to the input of an additional unit of comparison, which is connected to the inputs of the first OR element, the output of which is connected to the input of the second valve through the element NOT and to the input of the first valve directly, the output of the calculating unit of the total, which is one of the device's outputs, is connected to the detector input 11rrsze directly and via mmepTop to the second output of the device nnBert: the input input of the additional 9 84 comparison unit, the clock input of the increment detector is connected to the output of the second element OR, inputs which are connected to the outputs of the reference functions of the weight functions of addition and subtraction, the direct output of the increment detector is connected to the summing, and the inverse - to the subtractive inputs of the bias unit, the output of which is connected to the second input of the summation block irovi Fig, 1 shows a functional diagram of the device; in fig. 2 - diagrams explaining his work. The device for controlling the confidence interval contains block 1 compare, valves 2 and 3, setpoint 4, weight function, addition, setpoint 5, weight subtraction function, total calculation unit 6, impulse generator 7, summation unit 8, additional comparison unit 9, elements OR 10 and 11, a user 12, an increment detector 13, an X element 14 and an offset setting unit 15. The device continuously monitors both limits of the confidence interval. Assume that the input process is a randomly varying pressure t-t) with the distribution function f () of FIG. 2a). Ag (t) upper bound, -a / i (-fc) - lower bound estimate of the desired interval, previously defined. The monitored signal is fed to the second input of the summing unit 8, which performs the displacement | (t). From the output of block 8, the summation of f -. (t) $ () + + Ujj is fed to the combined direct input of block 9 of comparison and the inverse input of block 1 of comparison. When (ij is outside the limits of the confidence interval, i.e., at § (7 / Ag (i) OR. (B) Ats (- |;), the output level appears at the output of one of blocks 1 or 9 compared respectively the passing element I1SCH 1O to the input of the valve 2. To simplify, let us assume that the trigger is O, i.e., (fit). If Ats1) f (;) Xg (f-), then the permissive level is set at the output of the element HE 14 - the input of the valve 3. When the clock permits go to the enable inputs of the clock pulses from the generator 7 to the input of the setting unit 4 centuries-old tracking function with) or -) A (-1:) and to the input of the preset 5 weight subtraction with D {.-) f (f -). p, () receive counting pulses.

Adjusters 4 and 5 of the weight functions of algebra and subtraction are frequency dividers with division coefficients K1 and K2, and

P + P- If K2 P “KIP, where P is the confidence level set by confidence.

  IC1 ka

those. By the ratio K1 and K2, the probability of the occurrence of the controlled process in the desired one is set. Every impulse posgupakshschy to the input of the setter

4, passing to summation, and K2-th imput, arriving at the input of the setter

5, passes to the subtracting inputs of bgyuk

6 total results, which

integrates the impulse sequences coming from the outputs of setters 4 and 5, and converts the rearplgat to the form of the input process. Otsesha felony border trust

the interval is formed at the output of the total calculation unit 6 and is fed to the direct input of the comparison unit 1, the lower limit estimate is formed at the output of the inverter 12, the CAPACITY input to the output of the general calculation unit 6, i.e. HL (.) Is D 6- (t) and is fed to the inverse input of the comparator unit 9. The equilibrium in the system is established when the pulse flows from the outputs of the units 4 and 5 are equal.

Detector 13 incremental, clocked by pulses from the output of the element OR C, analyzes the change in trick value. At the moment of pulse output at the output of one of the setting devices 4 or 5, the state corresponding to the state table is set at the direct output of the increment detector 13;

Claims (3)

1. USSR author's certificate  No. 494700, cl. H 03 K 13/02, 1973. 2. USSR author's certificate No. 744965, cl. H 03 K 13/02, 1976. 3. Patayet Yaposhsh number 54-16229, CP. H 03 K 13/02, 1979. (yy