SU934485A1 - Arithmetical average determining device - Google Patents

Description

(5) DEVICE TO DETERMINE THE AVERAGE ARITHMETIC

The invention relates to computational and digital measurement technology and is intended to determine the arithmetic mean with increased reliability. A device is known for determining the arithmetic average of electrical quantities l, comprising pulse formers, synchronization units, a generator, clock pulses, a pulse distributor, an adder, a frequency divider and channel control units, which determines the arithmetic average by the formula. the number of averaged values; the value of the i-th averaged quantity. The drawbacks of the device are the limited scope (multiple channel parallel measurements) and the low accuracy of the arithmetic average in the presence of erroneous values of averaged values. The most technical solution proposed by the technical solution is a device for determining the arithmetic average 2j, containing the first, second and third reversible counters, one-shot, input element I, trigger, selection counter, pulse generator, average counter and block of elements I. This device is defined is the arithmetic mean by the formula,.,), where D and AJ are, respectively, the first and j-Toe of n averaged values. The shortage of the known device is low accuracy of determination

arithmetic mean in the presence of erroneous values of the averaged value, and from expression (2) it is obvious that the degree of reliability depends on how much the first value of the averaged value differs from the true one.

The purpose of the invention is to increase the reliability of determining the arithmetic average.

This goal is achieved by the fact that the device for determining the arithmetic average, containing a pulse generator, the output of which is connected to the first inputs of the first and second elements AND, the output of the first element AND is connected by the first input of the third element And and the input of the subtraction of the first reversible counter, the output of which is connected to the input of the first | Vogo trigger, the output of the latter is connected to the second input of the third element And, the output of the third element And is connected to the input of the addition of the second reversible counter, the input of which is subtracted It is combined with the first input of the fourth AND element and connected to the output of the second AND element, the second input of which is the first input of setting the logical unit of the device, the sampling counter and the third reversal counter, the switch, the OR element, the comparison unit, the second trigger controlled by the divisor of the number of pulses, while the output of the second reversible counter is connected to the input of the second trigger, the output of which is connected to the second input of the fourth element I, the output of which is connected to the first input of the controlled product of the numbers pulses, the second last input is connected to the output of the sample counter, the input of which is combined with the installation input of the first reversible counter at zero and the second input of the first element I and connected to the output of the comparator unit, the first input of which is connected to the first output of the third reversible counter, the first and second the switch outputs are connected to the addition and subtraction inputs of the third reversible counter, the second output of which is connected to the first input of the OR element, the output of which is connected to the first input of the switch the second input of the latter is combined with the addition input of the first reversible counter and is an information input number

the pulse code of the device, the second input of the OR element is the upstream input of the setting of the logical unit of the device, the second input of the comparison unit is the input of the admissible value of the spread of the device code.

The drawing shows the block diagram of the device.

The device contains a controlled

pulse number divider 1, first trigger 2, first reversible counter 3 second trigger t, switch 5, element OR 6 second reversible counter 7, block 8 comparison, counter

9 samples, the first 10, the second 11, the third 12, the fourth 13 elements And, the generator} C pulses and the third reversible counter 15.

Claims (2)

The device determines the arithmetic average by the formula. . , (3) where 2 t Q,. / jPr- (o Y / iV-f ii / value of the allowable spread of averaged values. Improving the reliability of determining the arithmetic average is achieved by eliminating sequentially measured values from the number of averaged bodies, the difference between which exceeds the specified value of the allowable spread. The device works as follows The averaged values, represented by the number of the pulse code, are successively fed to the device’s short pulse input and then to the input of the switch 5 and the input of the first reversal about the counter 3. The switch 5 is controlled by applying to its first input an appropriate level of signal from the output of the OR element.6. Values fed to the digital pulse input using odd numbers correspond to a high level of the signal at the second logical input of the device and accordingly at the output element 6, while the first output of the switch 5 is connected to the input of the reversible counter 15- Even in the order of arrival on the pulse input value corresponds to a low signal level on the secondary A logical input and output of the element OR 6, and the number-pulse code through the switch 5 is fed to the subtraction input of the third reversible counter 15. Thus, in the reversing counter 15, the difference between two values of the second input to the first input is determined, if the even value of A2 exceeds the previous odd, the second output of the reversible counter 15 at the time of reaching the zero difference forms a high signal level which switches element 5 through the element OR 6 so that the remaining part of the pulses of the subtracted value A. And. is fed to the addition input of the counter. As a result, at the first output of the counter 15 there will be a modulus code of the difference of two consecutive values /, which is compared in comparison block 8 with the code of the value of the permissible throw of the values arriving at the second information input. Simultaneously with finding the difference of two consecutive values on the first reversible counter 3, they are summed up. If the difference modulus does not exceed the values of the permissible spread of the values of /., A high level of the signal arriving at the counting input of the sampling counter 9, changing its state and allowing the passage of pulses from the generator T output through the first And 10 to input subtracting the reversible counter 3 and the second input of the third element And 12, at the input of which is the enable signal from the output of the first trigger 2. Thus, the sum of two consecutive values of A2Y .. + is read. reversible counter 3 to reversible counter 7- When a zero difference is reached in counter 3, a signal is generated at its output, which through the first trigger 3 prevents further passage of pulses through the third element 12. If the difference modulus of two consecutive values exceeds their value. permissible variation, the output of block 8 comparison produces a low signal level that does not change the state of the sampling counter 9. It prohibits the AND 5 pulses from passing through the output of the generator 1 and sets the reversible counter 3 to zero. In this case, the sum of these two last values, at least one of which is unreliable, is not entered into the reversible counter 7. All other pairs of consecutive values are subjected to similar processing. Obviously, when averaging the n values, the number of such pairs will be equal to I / 2 and at the end of their processing, the sample counter 9 counts the NUMBER of valid pairs defined by the expression m. With a-, and in the reverse counter 7 the values of reliable pairs are added in accordance with After this, a high signal level is applied to the first logical input of the device, allowing the passage of pulses from the generator to the subtraction input of the reversible counter 7 and the first input of the fourth element I 13, the second input of which The permitting signal from the output of the second flip-flop k When a zero difference is reached in counter 7, a signal is generated at its output that, through the second trigger, prohibits further passage of pulses through the fourth element 13. Thus, to the first input of the controlled divider 1, the number of pulses from the output of the element And 13, the number of pulses arrives, determined by the expression (U) .Ha the second input of the controlled divider 1, which specifies the division factor, is supplied with the binary code from the output of sample counter 9, shifted by one bit in the direction of the old it, which corresponds to multiplying by two numbers, recorded in the counter E- From the output of the controlled divider 1, the number of pulses is removed, which determines the arithmetic average only for reliable values in accordance with the expression (3). By changing the value of the acceptable spread of averaged values, you can change The degree of confidence in the determination of the arithmetic mean. The invention The device for determining the arithmetic average containing