SU723588A1 - Statistical analyzer of distribution of frequencies - Google Patents

Description

(54) STATISTICAL FREQUENCY DISTRIBUTION ANALYZER

The invention relates to computing and can be applied to study the laws of the distribution of the discrete random magnitude of various physical objects, the output of which is a discrete random process in the form of a discrete random sequence of voltage (current) pulses. A random time interval analyzer is known, which contains a trigger, two one-shot, two meters, two blocking oscillator waiting elements, AND, and delay element 1. The drawbacks of the device are the limited functionality of directly determining the frequency distribution of the signal. The closest to the invention is an analyzer that contains the first and second triggers, the zero and single outputs of which are connected respectively to the zero and single inputs of the third and fourth parameters i-epoB, the first, second and third binary counters, whose information inputs connected to the first input of the analyzer, through the first key to the output of the first threshold element and through the second key to the output of the second threshold 3.riement; the control inputs of the binary counters are connected to the second input of the analyzer; triggers , delay elements, capacitors. In the known device, information in the form of a coded random binary number is displayed on the multichannel indicators 2. This device does not allow to analyze automatically and with high speed the frequency of the pulses of a discrete random process, which is necessary when calculating for a random value the probability of its falling on the area symmetrical with respect to the scattering center. If a frequency is set as a random variable, then when testing the generator, the problem is solved, with what probability does the generator frequency remain in a limited area, the center of which coincides with the nominal frequency when the external conditions change (temperature, humidity, pressure, vibration, etc.). P.).

The purpose of the invention is to expand the functionality of the device by determining the probabilities that the signal frequencies fall within a predetermined range.

The goal is achieved by the fact that in the analyzer containing two triggers, the counting input of the first trigger is the information input of the analyzer, the zero and single outputs of the first and second triggers are connected respectively to the inputs of the third and fourth triggers, the first counter, whose information input is connected to the analyzer input, the second and third counters, the information inputs of which are connected to the outputs of the corresponding keys, the information inputs of which are connected to the outputs of the corresponding threshold elements The first, second, and second triggers are connected to the second input of the analyzer, separation capacitors, delay elements, two time interval converters are introduced into voltage and four triggers. The unit inputs of the fifth and sixth triggers are connected to the output of the first time interval to voltage converter, the single inputs of the seventh and eighth triggers are connected to the output of the second time interval to voltage converter. The zero inputs of the fifth and sixth flip-flops are connected via a coupling capacitor to the zero output of the third flip-flop, the zero inputs of the seventh and eighth flip-flops are connected via a coupling capacitor to the zero output of the quadrigger. Additional inputs of the fifth and seventh, sixth and eighth flip-flops are connected to the corresponding sources of constant signals, single outputs of the fifth, third and sixth flip-flops and seventh, fourth and eighth flip-flops are connected to the first, second and third inputs of the corresponding threshold element, respectively. The control inputs of the first and second keys through the corresponding element. the delays are connected respectively to the unit outputs of the third and fourth triggers, the inputs of time interval converters to voltage are connected via the corresponding delay elements respectively to the zero outputs of the first and second triggers, the unit output of the first trigger is connected to the counting input of the second trigger.

Figure 1 shows the frequency analyzer circuit; 2 and 3 are graphs of intervals of a random sequence of pulses.

The dialyzer contains transducers 1 and 2 of the time interval to voltage (pulse amplitude).

converting time intervals between two adjacent pulses of a random sequence into sawtooth pulses, the maximum value of which amplitude is proportional to the time interval. Converter 1 converts even and converter. 2 - odd time intervals of a random sequence of pulses.

Triggers 3,4 distribute even intervals of a random sequence of pulses (Fig. 2) arriving at the input 5 of the analyzer, output them to the zero and single inputs of flip-flops 6,7 and through elements 8 and 9 delay the inputs of the converters 1,2.

Triggers 6.7 memorize the control signals coming from triggers 3, 4, and control commands are generated at the outputs.

Dividing capacitors 10, 11 convert single signals at zero outputs of flip-flops 6.7 into short pulses, which set flip-flops 12, 13, 14 and 15 into zero states.

Triggers 12,13,14 and 15 remember the magnitude of the amplitude of the sawtooth voltage (Fig. 2) at the outputs 16, 17 of the transducers 1, 2, and the triggers 12,14 due to an internal change in the parameters of tuning to trigger from the maximum frequency, and Triggers 13.15 - from r minimum frequency p ,.

Threshold elements 18,19, each of which is triggered (generates a single signal at the output) when there are only two single signals at any of the three inputs, form the control signals.

The keys 20, 21, by single signals coming through the delay elements 22, 23 to their control inputs, control the outputs of the threshold elements 18, 19.

The binary counters 24 and 25 count the even and odd pulses of a random sequence, respectively, that arrive in a given (hatched) zone of a random variable X- (Hz), (FIG. 3).

Binary counter 26 records the total number of pulses received at the input 5 of the analyzer. The total number of pulses of binary counters 24, 25 divided by the number of pulses recorded by binary counter 26 gives the value of the integral LR, the value of which determines the effectiveness of the test object.

The analyzer input 27 serves to send control commands.

Zero and single outputs of the flip-flops 3,4 are connected respectively with zero and single inputs. Triggers 6.7. Binary counters 26,24 and 25 information inputs are respectively connected to the input 5 of the analyzer, via key 20 to the output of threshold element 18 and via key 21 to the output of threshold threshold 19. The control inputs of binary counters 24, 25 and 26 are connected to input 27 of the analyzer, the unit output of trigger 3 is connected to the counting input of trigger 4, zero in triggers turns 3.4, respectively, h cut delay element 8 and converter, body 1 and delay element 9, and converter 2 are connected to single trigger inputs 12, 13 and 14 , whose left entrances through the cond nsat ry 10,11 are connected to the zero output of flip-flops 6 and E 7.Pervye, second and third inputs of the threshold elements 18, 19 are respectively connected to the unit GOVERNMENTAL 12,6,13 outputs of flip-flops and the outputs of flip-flops U Specialized niche 14,7,15. The second inputs of the threshold elements 18-19, respectively, through the elements of the delay 22.23 are connected to the control inputs of the keys 20.21. The analyzer works as follows. On the triggers 12, 13, 14, 15, limits are set, p are randomly the values of X, i.e. the magnitude of the amplitudes of the pulses applied to the single inputs of the flip-flops, when the quotes are triggered. On a command, the initial input to the analyzer input 27, binary counters 24, 25, and 26 are set to the initial position, the triggers 3,4 are set to one states. Pulses of a random sequence (Fig. 2) are output from the output of the pulse generator being tested to the input 5 of the analyzer. The first pulse arriving at the input 5 of the analyzer transfers the trigger 3 to the zero position. A single signal from the zero output of the trigger 3 through the delay element 8 starts the operation of the converter 1, which at the output 16 begins to form the first increasing impulse corresponding to the odd interval db. The increasing impulse arrives at the single inputs of the flip-flops 12, 13. The second impulse at the input 5 of the analyzer transfers the trigger 3 to the single state, the transducer 1 stops its operation, the first impulse (Fig. 2) abruptly ends. The first incremental pulse at the single inputs of the trg-gages 12, 13 may lead the last to the following situations m. (N; -.) - the triggers 12 and i3 are fired by the E zero state. at. (dG /) P) trigger 12 goes into one state. () p0) the triggers 12 and 13 go to one state. The second pulse (Fig. 2, 5) triggers the 6 switch to the single state, polls the threshold element 18 and opens the key 20 through the delay element 22. In the situation (2), two single pulses are observed at the inputs of the threshold element 18 and at its output a single signal is generated which, through the switch 20, is fed to the input of the binary counter 24 and fixed by it. In situations (1) and (3.), the threshold element 18 does not work, since in this case there are one or three single pulses at its inputs. At the same time, on the second pulse, trigger 4 passes to the zero state. As a consequence, the flip-flops 14, 1-5 also go to the zero state and the transducer 2 comes into operation, forming the first pulse (Figs. 2, 17) corresponding to the even interval. If threshold element 19 is in situation (2) at the beginning of the third pulse, then binary counter 25 captures the pulse. With the arrival of the third and subsequent pulses (Fig. 2.5), the work cycles at odd and even intervals ltj are repeated. When counting a given number of pulses, binary counter 26 generates an overflow pulse (stop), which stops the supply of pulses to the input 5 of the analyzer. The proposed device, due to the presence of new elements and new connections, allows to significantly expand the functionality and calculate the efficiency in the form of the probability with which the pulse frequency of the tested generator remains in a limited area, the center of which coincides with the nominal frequency value when the external conditions change (temperature, humidity, pressure, vibration, etc.). In the process of solving such a task, one can determine the magnitude of the efficiency (LP) of the selected frequency stabilization scheme or its individual parameters, and the multiple solution of such a problem during tests allows a comparative analysis of the selected stabilization schemes and their parameters with high accuracy and speed. Automating the process of investigating a discrete random variable allows not only to exclude subjective errors of the calculator, but also to shorten the testing time of frequency generators and other objects with frequency characteristics and to make objective decisions based on the results of objects testing.

Claims (1)

1. USSR author's certificate No. 378858, C. S Ob F 15/36, 1971. 2, USSR Author's Certificate 450176, C. 06 F 11/00, 1973. I(  X- 29