SU746551A1 - Device for determining probability density function - Google Patents

Description

(54) DEVICE FOR DETERMINING THE FUNCTION OF THE PROBABILITY DENSITY

The invention relates to automation and visual technology and can be used in the development of equipment for the study of computerized random signals with a spectrum of up to hundreds of megahert and also for inputting digital data with a discrete representation of analog values of a two-dimensional probability density function. A device for determining a two-dimensional probability density function is known, consisting of a generator, two channels of amplitude-pulse module 1 and amplitude of discriminators, a coincidence circuit, a result counter, a pulse delay circuit and a circuit specifying the number of samples. However, in view of the limited speed of the amplitude-pulse modulators and the amplitude discriminators, a separate quasi-time and amplitude, these are. devices do not allow to investigate broadband signals. The use of a fixed pulse delay scheme and the absence of automatic control schemes for discriminator triggering levels does not allow automating the conversion process into a sequence of codes of the functions of the probability density function in two coordinates and using the specified device in CVM information from objects in real timescale. The closest technical solution to the present invention is a device for determining the density function, comprising a high-speed amplitude-time quantizer with two controllable thresholds and a logic element AND, a pulse generator, a code-analog converter, generating two voltages with a constant amplitude shift , the first and second counters of the automatic control of the amplitude coordinates 4 | p and the result counter with the AND element and the registration unit 2.

A disadvantage of the devices is that it does not have an input for connecting a signal that determines the second coordinate of the probability density, it does not have a quantization scheme for the input signal but time with a controlled time shift. This limits the ability of the device to transform into a sequence of codes a one-dimensional probability density function,

The object of the invention is to enhance the functionality of the device by providing a possibility of two-dimensional amplitude and time analysis.

This goal is achieved in that the device for determining the probability density function, containing the first amplitude-time factor, the first input of which is the first input of the device, the second input and is connected to the output of the pulse generator and the input of the first counter, the output of which is 6 mountain counter and the first input of the first block of elements And, the output of which is connected to the registrat oura, and the second input of the third counter, the output of the second counter is connected to the input of the ner & the code-voltage, which is connected to the third input of the amplitude-to-earth quantizer, introduced the second block of elements AND, the block of elements AND-OR converter code-time, second converter code-voltage, fourth counter and second amplitude-embedded kvaj fovate b, the first input of the xoTopoiro is the second input of the device, and the BSC is connected to the first input of the second block of I elements, the second gypsbD of kbWpt rb is connected to the output of the first quantized time quantizer, and the input of the second block of the elements of a flooded day of its counter, the second and third inputs of the second amplitude-time quantizer are connected, respectively, with the outputs of the code-voltage converter and the code-time converter, the first input of which is noJ Uano4eH to the output of the pulse generator and the second input to the first output of the AND-OR element block, the second output which is connected to a converter with a co-dG voltage, controlling the output of a block of AND-OR elements is a control input of the device, the first input is connected to the output of the second counter and the input

the fourth counter, the output of which is connected to the second input of the block of elements AND-OR,

The drawing shows a diagram of the proposed device for determining the probability density function.

The device consists of two identical (two-threshold. Gated) amplitude-time quantizers 1 and 2,

3 pulse generator ,. counters 4,5, 6 and 7, two converters 8 and 9 code-voltage, converter code-time 10, block 11 of registration, blocks of elements 12 and 13 of And block of elements

14 AND-OR,

The device works as follows.

In a two-dimensional amplitude analysis, the signals under study are fed respectively to the inputs of quantizers 1 and 2, to the control time inputs of which are fed respectively from the outputs of the generator 3 and the code-time converter 10 gate 1, the gate amplitudes to the control amplitude INPUT quantizes 1 and 2 do accordingly with. The output of the transducers of code-voltage 8 and 9 are two nopypovyh tension j a n-DC, slid one over the other by the default value of the amplitude analysis window b U, In quantizers 1 and 2, the signal under study is quantized by time and amplitude,

moreover, the initial logical signals y are forked according to the Zero equation;

W-2.

, and K, - logical signals about

if the amplitude of the investigated sygium exceeds the amplitude of the given U d levels at the time of quantization over time.

The functions of the quantization unit are performed by two high-speed gated

the comparator, which were implemented, for example, in the form of triggers on tunne diodes, one of which sets the trigger level and, another, U, and from their output signals X and logic

the output element V is generated at the element. In accordance with the indicated function, each of the quantizers selects pulses corresponding to the input signals

in the amplitude analysis windows U,

at the levels and J) specified for each quantizer 1 and 2 by the output signals of the transducers, the code voltage is 8 and 9. The time the wallpaper corresponding to the simultaneous hit of the investigated signals into the specified amplitude windows is fixed by the output pulses of the block of elements 12 And, quantizer output signals are fed to the inputs. The result of converting a single point of a function of two-dimensional probability density accumulates in counter 4 (result) over time, determined by the capacity of counter 5 (accumulation period) and generator frequency 3. Counter overflow signals 5 are opened with the help of a block of elements 13 And the bus connecting a counter 4 with a registration unit 11 in which, at the same time, the result of one point of the function is stored. The functions of the registration unit 11. Performs a digital computer. The same overflow signal of counter 5 increases the content of counter 6 (channels of one coordinate) by one, which causes an increase in the voltage at the output of converter 8, the code-voltage of the first channel by one quantum. In this case, counters 4.5 and 6 are set to the zero state and accumulation of the next value of the function begins. The CAPACITY of the counter 6 corresponds to the number of channels of the first coordinate. The overflow signal increases the content of the counter 7 (channels of the second coordinate) by one, which causes an increase in the voltage at the output of the converter 8, the code-voltage of the second channel by one quantum. In this case, the counters 4.5 and 6 E are set to the zero state and the accumulation of the function values along the first coordinate begins. In the considered two-dimensional amplitude analysis mode, a single sig is applied to the control input 15 of block 14 of the AND-OR elements (1al, connects the code-voltage to the input 9, the output code of the counter 7, and the zero code to the input of the 10-dimensional time signal. For a two-dimensional time signal, analysis of the probability density, one input signal under study is connected to both inputs of quantizers 1 and 2. A zero signal is applied to the control input of the block 14 of the AND-OR elements, and the output voltage of the counter 6 (the first coordinate Nata), which ensures that the same levels of triggering of quantizers 1 and 2 are set. The same 516 control sigyo / 15 switches the output of counter 7 (second coordinate) “w input conversion 10 code-1 ff4Y, which is in accordance with with the state of counter 7, it controls the H1 -Herminal of the shift between its output pulses, which determine the strobing moments (observation of the input signal) of the quantifier 1 and 2, In cx, the processes considered are similar to the mode considered. Thus, in a two-dimensional time analysis, in the counter 4, the results accumulate sequences of values of probability density functions corresponding to the psi of the signal under study in; The AM window is observed when it is watched at fixed moments of time shifted by a fixed row, the number and value of which is determined by the Pilot's capacity b and the range of converter code-time. The use of new elements — the second quantizer 2, the converter Yuko / time, the converter 9 — the Nyprol code, the counter 7 (second coordinate), and the blocks of elements 12 AND 14 AND-OR — distinguishes the device from the known, since it provides the possibility of converting to of the code of the function of two-dimensional n relative probabilities, it is possible to choose as the second coordinate the function of both the amplitude of the other or the input signal recorded simultaneously with the amplitude of the first, as well as the time coordinate of one investigated signal. The formula of the invention. The device for determining the function of the density of veraatnosti containing the first ampli-time quantizer, the first input of which is the first input of the device, the second input is connected to the output of the pulse generator and the input of the first counter, the output ogorm o is connected to the input of the second counter and the first 1M input of the first of the element block I, the output of which is connected to the registrar, and the second input is connected to the output of the third counter, the output of the second counter is connected to the input of the first code-transformer, the output It is connected to the third input of the first amplitude-time quantizer, different in that, with

the purpose of expanding the functionality by providing a two-dimensional amplitude and time analysis, it contains the second block of AND elements, the block of AND-OR elements,

code-time converter, second code-voltage converter, fourth counter and second amplitude-time quantizer, the first input of which is the second input of the device, and the output is connected to the first input of the second block of elements I, the second iHood of which is connected to the output of the first amplitude- time quantizer, and the output of the second block of elements And is connected to the input of the third counter, and three and the third time of the second amplitude-time quantizer are connected, respectively, to the codes of the code-voltage converter and code-time converter

The first input is connected to the output of the pulse generator, and the second input to the first output of the AND-OR block is the second output of which is connected to the input of the code-voltage converter, the control input of the AND-OR block is the control input of the device, the first input is connected with entry of the second counter and the input of the fourth counter, the output of which is connected to the second input of the unit elev1 & AND-OR ..

Sources of information taken into account in the examination.

1. Mirsky G, I, Apparatus definition of the characteristics of random processes, M., Energie, 1972, p., 334,

2. USSR author's certificate for application number 2387237 / 18-24,

cl. Q 06 G 7/52, 1976 (prototype).

Claims (1)

Claim A device for determining a probability density function containing a first amplitude © -time quantizer, the first input of which is the first input of the device, the second input is connected to the output of the pulse generator and the input of the first counter, the output of which is connected to the input of the second counter and the first input of the first block of elements And, the output of which is connected! to the recorder, and the second input is connected to the output of the third counter, the output of the second counter is connected to the input of the first code-voltage converter, the output of which is connected to the third input of the first amplitude-time quantizer, characterized in that, in order to expand the functionality by providing the possibility of two-dimensional amplitude and time analysis, it contains a second block of AND elements, a block of AND-LI elements, a code-time converter, a second code converter -voltage, the fourth counter and the second amplitude-time quantizer, the first input of which is the second input of the device, and the output is connected to the first input of the second block of AND elements, the second INPUT of which is connected On the output of the first amplitude-time quantizer, and the output of the second block of AND elements is connected to the input of the third counter, the second and third inputs of the second amplitude-time quantizer are connected respectively, "with the outputs of the code-voltage converter and code-time converter, the first input kotorogo connected to the output of the pulse generator and the second input to the first output · elements aND-unit and whether a second output of which is connected to vho- ₅ do code-converter the voltage control input of unit elements is an aND-OR simp vlyayuschim input device, a first input connected to the output of the second counter and the input chet10 VERT counter whose output is connected to a second input of block elements AND-OR.