RU2252690C1 - Device for determining bandwidth of vision system spatial-frequency channel - Google Patents

Abstract

FIELD: medical equipment.

SUBSTANCE: device has two toggle switches, three switches, five gates, shift register, mode switches, two flip-flops, two NOT gates, linearly changing voltage oscillator, memorizing analog unit, analog multiplexer, five univibrators, two OR gates, voltage-to-frequency converter, light pulse source, second pulse oscillator, calculator, average meaning calculator, counter, two indication units.

EFFECT: simplified procedure of determining bandwidth.

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Description

The invention relates to medical equipment and is intended to determine the bandwidth of the spatial-frequency channel of the visual system.

A device based on a computer for studying the spatial-frequency channels of the human visual system by presenting sinusoidal gratings with different spatial frequencies [1].

To form images of various shapes — a world of variable contrast, different spatial frequencies with a sinusoidal brightness profile, two-dimensional arrays with a sinusoidal brightness distribution, a programmable synthesizer is known that contains a microcomputer, an interface, a control synchronization unit, a test answer input panel, video buffer memory, and digital-to-analog converter, video control device, operator terminal and plotter [2, Fig. 38, p. 68]. The images being formed are displayed on the screen of the video monitoring device, the test subject’s response is entered into the computer by pressing the buttons “see” - “do not see” [2, p. 84].

The disadvantages of the known devices are the long preparatory period, the need for sophisticated special equipment, the complexity of research.

The closest in technical essence to the present invention is a device for studying the critical flicker fusion frequency, containing a test button, first, second and third triggers, first and second waiting multivibrators, a mode switch, a ramp generator, a voltage-frequency converter, a light pulse source , a comparator, a failure indicator, a shift register, an OR element, a calculator and a block of indicators, the output of the generator being connected to the inputs of the comparator and a voltage-frequency generator, the outputs of which are connected respectively to the inputs of the failure indicator and the source of light pulses, the outputs of the first, second and third triggers are connected via a mode switch to the generator input, the output of the first standby multivibrator is connected to the first input of the second trigger and the input of the second standby multivibrator, output which is connected to the second inputs of the second and third triggers, the test button output is connected to the input of the shift register, the first output of which is connected to the first input m of the first trigger, the second output - with the second input of the second trigger and the input of the first waiting multivibrator, the third output - with the first input of the OR element and the third trigger, the second input of the OR element is connected to the output of the first waiting multivibrator, and the output - with the first input of the calculator, the second the input of which is connected to the output of the voltage-frequency converter, and the output is connected to the input of the indicator block [3].

The disadvantage of this device is the inability to determine the bandwidth of the spatial-frequency channel of the visual system.

In the present invention, in a device for studying the critical flicker fusion frequency, comprising a mode switch, a ramp generator, a voltage-frequency converter, a light pulse source, a shift register, an OR element, a calculator and a block of indicators, the output of the mode switch being connected linearly to the generator input changing voltage, the output of the OR element is connected to the first input of the calculator, the output of the voltage-frequency converter is connected to the input of the light source x pulses and with the second input of the calculator, the first and second toggle switches, the first to third switches, the first to fifth valves, the first and second triggers, the first and second elements are NOT entered, the analog storage device, the analog multiplexer, the first to fifth one-shots, the second element OR, a second pulse generator, an average value calculator, a counter and a second block of indicators, the outputs of the first and second switches are connected to the inputs of the mode switch, the normally closed output of the first switch is also connected to The V-input of the first trigger and the input of the first element NOT, the output of which is connected to the V-input of the second trigger, the outputs of the first and third keys are connected respectively to the first inputs of the first and second valves and to the input of the shift register, the first output of which is connected to the input of the first one-shot , the second output is with the D-input of the first trigger, the third output is with the D-input of the second trigger, the outputs of the first and second valves are connected to the inputs of the mode switch, the output of the first one-shot is connected to the first input of the analog device storage, the output of which is connected to the second input of the analog multiplexer, the output of the ramp generator is connected to the second input of the analog storage device and to the first input of the analog multiplexer, the output of which is connected to the input of the voltage-frequency converter, the output of the second pulse generator is connected to the second inputs of the first and second gates, with the first inputs of the third and fifth gates, the input of the second element NOT, the input of the fifth one-shot, the address input multiplex analog and C-input of the first trigger, the output of which is connected to the second input of the third valve, the output of the second element is NOT connected to the first input of the fourth valve and C-input of the second trigger, the output of which is connected to the second input of the fourth valve, the outputs of the third and fourth gates are connected respectively to the first and second inputs of the second OR element, the output of which is connected to the inputs of the second and third single-vibrators, the output of the second single-vibrator is connected to the first input of the first OR, the output of the third brother - with the input of the fourth one-shot and the second input of the first OR element, the output of the calculator is connected to the first input of the average value calculator, the second input of which is connected to the output of the fourth single-vibrator, and the output is with the input of the first block of indicators, the voltage-frequency converter output is connected to the second input the fifth valve, the output of which is connected to the counter input of the counter, the counter zeroing input is connected to the output of the fifth one-shot, and the output is connected to the input of the second block of indicators.

The inventive device due to the introduction of the first and second toggle switches, the first to third keys, the first to second valves, the first and second triggers, the first and second elements NOT, the analog storage device, the analog multiplexer, the first to fifth single vibrators, the second OR element, the second pulse generator, the average value calculator, counter and the second block of indicators allows you to determine the bandwidth of the spatial-frequency channel of the visual system and at the same time:

- reduce the preparatory period;

- simplify the determination procedure;

- use less sophisticated special equipment.

Thus, the claimed device differs from the known new properties that determine the receipt of a positive effect.

Figure 1 presents a structural diagram of the inventive device, figure 2 and figure 3 are timing diagrams explaining its operation.

The inventive device contains the first 1 and second 2 toggle switches, first to third 3-5 keys, first to fifth 6-10 gates, shift register 11, mode switch 12, first 13 and second 14 triggers, first 15 and second 16 elements NOT, generator 17 linearly varying voltage, the device 18 is analog storage, the multiplexer is 19 analog, the first to fifth is 20-24 single vibrators, the first 25 and second are 26 elements OR, the converter 27 is a voltage-frequency source 28 light pulses, a generator 29 second pulses, a computer 30, a computer 31 average values, s meter 32, first 33 and second 34 blocks of indicators.

The toggle switch 1 is designed to set the installation modes of incremental and decrement frequencies of light flicker.

The toggle switch 2 is designed to set the modes of fast and slow changes in the frequency of light flicker with speeds of 2.0 and 0.5 Hz / s, respectively.

The first 3 switch is used to set the generator 17 in the mode of generating a ramp voltage corresponding to a change in frequency at the output of the voltage-frequency converter 27 at a speed specified by the toggle switch 2.

The second 4 key is designed to set the generator 17 in the mode of generating a linearly incident voltage corresponding to a change in frequency at the output of the voltage-frequency converter 27 at a speed specified by the toggle switch 2.

The third 5 key is intended for fixing the measurement results.

The analog storage device 18 is designed to store the voltage corresponding to the set initial frequency of light flicker at the output of the Converter 27.

The calculator 30 is designed to calculate the differences of the fixed incremental and initial frequencies ΔF _AND = F _AND -F _H or the fixed initial and decrement frequencies ΔF _D = F _H -F _D.

The average value calculator 31 is designed to calculate the arithmetic mean of the frequency differences ΔF = (ΔF _AND + ΔF _D ) / 2, equal to the passband of the spatial frequency channel of the visual system.

The first 33 block of indicators is designed to indicate the bandwidth of the spatial-frequency channel of the visual system.

The second 34 block of indicators is intended to indicate the current - initial, incremental or decrement - frequency of light flickers.

The purpose of the remaining nodes corresponds to their name.

Keys 1-3 are manual switches to two positions for closing and opening electrical control circuits and are made in the form of control buttons.

Triggers 13-14 are standard synchronous DV triggers with a null input.

As the generator 17 of a linearly varying voltage, a standard integrator is used on the operational amplifier with input registers switched by a mode switch 12 to obtain a different rate of voltage rise at the output of the generator 17, and by changing the polarity of the input voltage, change the direction of integration (rise or fall of the output voltage) .

The device 18 analog storage can be performed according to the scheme [4, Fig.8.17, p.240].

The analog multiplexer 19 can be performed on the K561KP1 microcircuit [4, Fig. 2.9, p.41].

The calculator 31 of the average value can be performed by A. with. 1623605 USSR [5, knot 16].

The remaining nodes are well known.

The device operates as follows. In the initial state, the toggle switch 1 is in the position corresponding to the setting mode of the incremental frequency of light flickering, the toggle switch 2 is in the position corresponding to the mode of slow change of the frequency of light flickering with a given speed, as shown in figure 1. When power is turned on, code 1000 is written to shift register 11, triggers 13-14 are turned off, counter 32 is reset (chains are not shown), generator 29 generates 1-second pulses at the output, generator 17 outputs a constant voltage corresponding to the frequency of light flickering at the output Converter 27, equal to 25 Hz, that is, the average frequency of the accepted visible range of light flicker from 0 to 50 Hz. When the logic unit signal at the output of the generator 29, the voltage from the output of the generator 17 through the multiplexer 19 is fed to the Converter 27, where it is converted to a frequency that controls the source 28, and also opens the fifth 10 valve. On the leading edge of each signal of a logical unit from the output of the generator 29, the fifth 24 one-shot generates a short pulse, resetting the counter 32. The frequency from the output of the converter 27 through the open fifth 10 valve is supplied to the counting input of the counter 32, the counting result is output to the second 34 block of indicators.

The test key closure 3 or 4 sets the specified initial F _H light flicker frequency, taken as the average frequency of the determined bandwidth of the spatial frequency channel of the visual system.

To set the initial F _H light flicker frequency greater than 25 Hz, the subject closes the first 3 keys. When a signal of a logical unit at the output of the generator 29, the first 6 valve opens. The signal from the output of the first 3 keys through the open first 6 valve and the mode switch 12 sets the generator 17 in the mode of generating a ramp voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

To set the initial F _H light flicker frequency, less than 25 Hz, the subject closes the second 4 key. When a logical unit signal at the output of the generator 29, the second 7 valve opens. The signal from the output of the second 4 keys through the open second 7 valve and the mode switch 12 sets the generator 17 in the mode of generating a linearly incident voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out in a similar way.

On opening the first 3 or 4 of the second key generator 17 keeps the output constant voltage corresponding to the set initial frequency F _H of light flashes at the output of inverter 27. Control source 28 and outputting the count result frequencies of light flashes on the second indicator unit 34 is carried out similarly.

The test subject closes the third 5 key for a short time. The pulse from the output of the third key 5 shifts the state of the register 11 by one bit to the right, the signal of the logical unit from the first output of the register 11 goes to the first one-shot 20, which generates a pulse from its leading edge to the device 18. The device 18 stores the voltage corresponding to the set the initial F _{H the} frequency of light flickering at the output of the Converter 27 (figure 2, time T ₀ ).

The test subject sets the second 2 toggle switch in the position corresponding to the mode of rapid change of the frequency of light flicker with a given speed, and closes the first 3 key (figure 2, time T ₁ ). When a logical unit signal at the output of the generator 29, the first 6 valve opens. The signal from the output of the first 3 keys through the open first 6 valve and the mode switch 12 sets the generator 17 in the mode of generating a ramp voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the first 6 valve closes, the generator 17 saves the set constant voltage at the output, the voltage from the output of the device 18 corresponding to the initial light flicker frequency F _H passes through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, at the input of the converter 27, alternately, with a presentation time of 1 s, the voltage from the output of the generator 17 and from the output of the device 18, the corresponding incremental F _And and the initial F _H light flicker frequencies from the output of the converter 27, control the source 28 ( figure 2, the time interval T ₁ -T ₂ ).

On the time interval T ₁ -T _{2 the} subject determines the moment when presented alternately incremental F _{And the} initial F _H light flicker frequencies are different, and opens the first 3 key (figure 2, time T ₂ ). The generator 17 stores the set constant voltage at the output, at the input of the converter 27, alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding incremental F _И1 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the transducer 27 controls the source 28 (figure 2, the time interval T ₂ -T ₃ ).

The test subject sets the second 2 toggle switch in the position corresponding to the mode of slow change of the frequency of light flickering with a given speed, and closes the second 4 key (figure 2, time T ₃ ). When a logical unit signal at the output of the generator 29, the second 7 valve opens. The signal from the output of the second 4 keys through the open second 7 valve and switch 12 modes sets the generator 17 in the mode of generating a linearly incident voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the second 7 valve closes, the generator 17 stores the set constant voltage at the output, the voltage from the output of the device 18, corresponding to the initial light flicker frequency F _H , is supplied through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, the input of inverter 27 alternately, with the time of filing 1, through multiplexer 19 receives the voltage output from the generator 17 and output device 18, the corresponding incremental F _u and Initial F _H frequencies of light flashes output from the inverter 27 is controlled source 28 ( figure 2, the time interval T ₃ -T ₄ ).

On the time interval T ₃ -T _{4 the} subject determines the moment when presented alternately incremental F _{And the} initial F _H light flicker frequencies do not differ, and opens the second 4 key (figure 2, time T ₄ ). The generator 17 stores the set constant voltage at the output, at the input of the converter 27 alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding incremental F _И2 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the Converter 27 control the source 28 (figure 2, the time interval T ₄ -T ₅ ).

The test person closes the first 3 key (figure 2, time T ₅ ). When a logical unit signal at the output of the generator 29, the first 6 valve opens. The signal from the output of the first 3 keys through the open first 6 valve and the mode switch 12 sets the generator 17 in the mode of generating a ramp voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the first 6 valve closes, the generator 17 stores the set constant voltage at the output, the voltage from the output of the device 18, corresponding to the initial light flicker frequency F _H , is transmitted through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, at the input of the converter 27, alternately, with a presentation time of 1 s, the voltage from the output of the generator 17 and from the output of the device 18, the corresponding incremental F _And and the initial F _H light flicker frequencies from the output of the converter 27, control the source 28 ( figure 2, the time interval T ₅ -T ₆ ).

On the time interval T ₅ -T _{6 the} subject determines the moment when presented alternately incremental F _{And the} initial F _H light flicker frequencies are different, and opens the first 3 key (figure 2, time T ₆ ). The generator 17 stores the set constant voltage at the output, at the input of the converter 27 alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding incremental F _И3 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the Converter 27 control the source 28 (figure 2, the time interval T ₆ -T ₇ ).

The test subject shortly closes the third 5 key (figure 2, time T ₇ ). The pulse from the output of the third 5 key shifts the state of the register 11 by one bit to the right, the signal of the logical unit from the second output of the register 11 goes to the D-input of the first 13 trigger, at the V-input of which there is a signal of the logical unit from the normally closed output of the first 1 toggle switch.

On the leading edge of the signal of the logical unit from the output of the generator 29, the first 13 trigger is turned on, the signal from its output opens the third 8 valve, the signal of the logical unit from the output of the generator 29 through the open third 8 valve and the second 26 OR element is fed to the second 21 and third 22 single vibrators. On the leading edge of the signal of the logical unit from the output of the second OR element 26, the second 21 single-vibrator generates a pulse transmitted through the first 25 OR element to the computer 30, in which the value of the established incremental F _AND3 light flicker frequency is recorded. On the trailing edge of the signal of the logical unit, from the output of the second 26 OR element, the third 22 single-vibrator generates a pulse arriving at the fourth 23 single-vibrator and through the first 25 OR element to the computer 30, in which the value of the set initial F _H light flicker frequency is recorded.

The calculator 30 calculates the difference of the fixed frequencies ΔF _AND = F _FROM -F _H , the value of which is supplied to the calculator 31. On the trailing edge of the pulse from the output of the third 22 single-vibrator, the fourth 23 single-vibrator generates a pulse, according to which the value of the frequency difference ΔF _{AND is} recorded in the calculator 31.

The test subject sets the first 1 toggle switch to the position corresponding to the setting mode of the decrement frequency of light flickers. At the normally closed output of the first 1 toggle switch, a logic zero signal is set, which is fed to the first 15 element NOT. The test subject sets the second 2 toggle switch to the position corresponding to the mode of slowly changing the frequency of light flickering with a given speed, and closing the second 4 keys sets the specified initial F _H light flicker frequency in the same way as described above. The set initial F _H light flicker frequency controls the source 28, the result of counting the light flicker frequency is output to the second 34 block of indicators (Fig. 3, time point T ₈ ).

The test subject sets the second 2 toggle switch to the position corresponding to the mode of rapid change of the frequency of light flicker with a given speed, and closes the second 4 key (figure 3, time point T ₉ ). When a logical unit signal at the output of the generator 29, the second 7 valve opens. The signal from the output of the second 4 keys through the open second 7 valve and the mode switch 12 sets the generator 17 in the mode of generating a linearly incident voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the second 7 valve closes, the generator 17 stores the set constant voltage at the output, the voltage from the output of the device 18, corresponding to the initial light flicker frequency F _H , is transmitted through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, the input of inverter 27 alternately, with the time of filing 1, through multiplexer 19 receives the voltage output from the generator 17 and output device 18, the corresponding decremental F _D and the initial F _H frequencies of light flashes output from the inverter 27 is controlled source 28 ( figure 3, the time interval T ₉ -T ₁₀ ).

In the time interval T _10, -T ₉ test determines when alternately imposed and a decremental F _D F _H initial frequencies of light flashes different and opens the second switch 4 (Figure 3, at time T _10). The generator 17 stores the set constant voltage at the output, at the input of the converter 27 alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding decrement F _F3 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the transducer 27 controls the source 28 (figure 3, the time interval T ₁₀ -T ₁₁ ).

The test subject sets the second 2 toggle switch in the position corresponding to the mode of slow change of the frequency of light flicker with a given speed, and closes the first 3 key (figure 3, time T ₁₁ ). When a logical unit signal at the output of the generator 29, the first 6 valve opens. The signal from the output of the first 3 keys through the open first 6 valve and the mode switch 12 sets the generator 17 in the mode of generating a ramp voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the first 6 valve closes, the generator 17 saves the set constant voltage at the output, the voltage from the output of the device 18 corresponding to the initial light flicker frequency F _H passes through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, the input of inverter 27 alternately, with the time of filing 1, through multiplexer 19 receives the voltage output from the generator 17 and output device 18, the corresponding decremental F _D and the initial F _H frequencies of light flashes output from the inverter 27 is controlled source 28 ( figure 3, the time interval T ₁₁ -T ₁₂ ).

In the time interval T ₁₁ -T ₁₂ test determines when alternately imposed and a decremental F _D F _H initial frequencies of light flashes does not vary, and opens the first switch 3 (3, time T _12). The generator 17 stores the set constant voltage at the output, at the input of the converter 27 alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding decrement F _F2 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the transducer 27 controls the source 28 (figure 3, the time interval T ₁₂ -T ₁₃ ).

The test subject closes the second 4 key (figure 3, time T ₁₃ ). When a logical unit signal at the output of the generator 29, the second 7 valve opens. The signal from the output of the second 4 keys through the open second 7 valve and the mode switch 12 sets the generator 17 in the mode of generating a linearly incident voltage with a given speed. The control of the source 28 and the output of the result of counting the frequency of light flickering to the second 34 block of indicators is carried out similarly as described above.

When a logic zero signal at the output of the generator 29, the second 7 valve closes, the generator 17 stores the set constant voltage at the output, the voltage from the output of the device 18, corresponding to the initial light flicker frequency F _H , is supplied through the multiplexer 19 to the converter 27, where it is converted to a frequency, which controls the source 28.

Thus, the input of inverter 27 alternately, with the time of filing 1, through multiplexer 19 receives the voltage output from the generator 17 and output device 18, the corresponding decremental F _D and the initial F _H frequencies of light flashes output from the inverter 27 is controlled source 28 ( figure 3, the time interval T ₁₃ -T ₁₄ ).

In the time interval T ₁₃ -T ₁₄ test determines when alternately imposed and a decremental F _D F _H initial frequencies of light flashes different and opens the second switch 4 (Figure 3, at time T _14). The generator 17 stores the set constant voltage at the output, at the input of the converter 27 alternately, with a presentation time of 1 s, voltages from the output of the generator 17 and from the output of the device 18, the corresponding decrement F _F3 and the initial F _H light flicker frequency output, are supplied through the multiplexer 19 the transducer 27 controls the source 28 (figure 3, the time interval T ₁₄ -T ₁₅ ).

The test subject shortly closes the third 5 key (figure 3, time T ₁₅ ). The pulse from the output of the third 5 key shifts the state of the register 11 by one bit to the right, the signal of the logical unit from the third output of the register 11 is fed to the D-input of the second 14 trigger, at the V-input of which there is a signal of the logical unit from the output of the first 15 element NOT. When a signal of logical zero at the output of the generator 29 at the output of the second 16 element is NOT set to the level of the logical unit. On its leading edge, the second 14 trigger turns on, the signal from its output opens the fourth 9th gate, the signal of the logical unit from the output of the second 16th element NOT through the open fourth 9th gate and the second 26th OR gate is supplied to the second 21 and third 22 single-vibrators. On the leading edge of the signal of the logical unit at the output of the second 26 OR element, the second 21 single-vibrator generates a pulse transmitted through the first 25 OR element to the computer 30, in which the value of the set initial F _H light flicker frequency is recorded. On the trailing edge of the signal of the logical unit at the output of the second OR element 26, the third 22 single-vibrator generates a pulse transmitted to the fourth 23 single-vibrator and through the first 25 OR element to the computer 30, in which the value of the established decrement F _F3 light flicker frequency is recorded.

The calculator 30 calculates the difference of the fixed frequencies ΔF _d = F _H -F _D3 , the value of which is supplied to the calculator 31. On the trailing edge of the pulse from the output of the third 22 single vibrator, the fourth 23 single vibrator generates a pulse, according to which the frequency difference ΔF _{D is} written to the calculator 31. The calculator 31 calculates the arithmetic mean of the frequency differences ΔF = (ΔF _AND + ΔF _D ) / 2, equal to the passband of the spatial-frequency channel of the visual system, the calculation result is displayed on the first 33 block of indicators. At the end of the process, the transmitter 31 generates a pulse that sets the device to its original state (circuits not shown).

Thus, the claimed device allows you to determine the bandwidth of the spatial-frequency channel of the visual system.

Literature

1. Perizonius Eckart, Schill Wolfgang, Geiger Hans, Rohier Ralner. Evidence on the local character of spatial frequency channels in the human visual system. // Vision Res. - 1985. - V.25. - No. 9. - R. 1233-1240.

2. Shelepin Yu.E., Kolesnikova LN, Levkovich Yu.I. Visocontrastometry: Measurement of the spatial transfer functions of the visual system. L .: Nauka, 1985 .-- 103 p.

3. Patent 2026008 of the Russian Federation, MKI A 61 V 5/16. A device for studying the critical frequency of flicker fusion / V.V. Rozhentsov (RF). - Publ. 01/10/95, Bull. Number 1.

4. Lantsov A.L. and others. Digital devices on complementary TIR integrated circuits. - M.: Radio and Communications, 1983 .-- 272 p.

5. Copyright certificate 1623605 of the USSR, MKI A 61 B 3/00, 5/16. A device for measuring the critical frequency of flicker fusion / D.V. Gaskarov, M.M. Polevschikov, V.V. Rozhentsov, O.V. Rozhentsov (USSR). - Publ. 01/30/91, Bull. Number 4.

Claims (1)

A device for determining the bandwidth of the spatial frequency channel of the visual system, comprising a mode switch, a ramp generator, a voltage-frequency converter, a light pulse source, a shift register, an OR element, a calculator and a block of indicators, the output of the mode switch being connected linearly to the generator input changing voltage, the output of the OR element is connected to the first input of the calculator, the output of the voltage-frequency converter is connected to the input of the source pulses and with a second input of the calculator, characterized in that the first and second toggle switches, the first to third keys, the first to fifth valves, the first and second triggers, the first and second elements NOT, the analog storage device, the analog multiplexer, are first introduced into it -fifth one-shot, second OR element, second pulse generator, average calculator, counter and second block of indicators, the outputs of the first and second toggle switches connected to the inputs of the mode switch, normally closed output the first toggle switch is also connected to the V input of the first trigger and to the input of the first element NOT, the output of which is connected to the V input of the second trigger, the outputs of the first and third keys are connected respectively to the first inputs of the first and second valves and to the input of the shift register, the first output of which connected to the input of the first one-shot, the second output to the D-input of the first trigger, the third output to the D-input of the second trigger, the outputs of the first and second valves are connected to the inputs of the mode switch, the output of the first one-shot is connected to the first input of the analog storage device, the output of which is connected to the second input of the analog multiplexer, the output of the ramp generator is connected to the second input of the analog storage device and to the first input of the analog multiplexer, the output of which is connected to the voltage-frequency converter input, the output of the second pulse generator is connected to the second inputs of the first and second gates, with the first inputs of the third and fifth gates, the input of the second element is NOT, the input of the fifth one-shot ora, the address input of the analog multiplexer and with the C-input of the first trigger, the output of which is connected to the second input of the third gate, the output of the second element is NOT connected to the first input of the fourth gate and the C-input of the second trigger, the output of which is connected to the second input of the fourth valve, the outputs of the third and fourth gates are connected respectively to the first and second inputs of the second OR element, the output of which is connected to the inputs of the second and third one-shots, the output of the second one-shot is connected to the first input of the first electric OR, the output of the third one-shot - with the input of the fourth one-shot and the second input of the first element OR, the output of the calculator is connected to the first input of the average value calculator, the second input of which is connected to the output of the fourth single-vibrator, and the output - with the input of the first block of indicators, the output of the voltage converter the frequency is connected to the second input of the fifth valve, the output of which is connected to the counter input of the counter, the zeroing input of the counter is connected to the output of the fifth one-shot, and the output to the input of the second block indicator ov.

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