SU1333305A1 - Apparatus for measuring critical fusion frequency - Google Patents

Abstract

The invention relates to medical technology and can be used in psycho-physiological research. The purpose of the invention is to reduce the study time by adjusting the duration of repeated cycles of measurement of parameters of the time of the master circuits. The device contains a pulse generator 1, the first prohibition element 2, a reversible counter 3, a digital-analog converter 4, a voltage-frequency converter 5, a second prohibition element 6, a source of 7 light pulses, a recorder 8, a button 9, an element 10 OR, a trigger 11 , the first element 12 And, the second element 13 And,. counters counter 14 And, a group of 15 elements 2-2I-2ShSh. The pulses of the measuring frequency are fed from the output of the converter 5 to the input of the recorder 8 and through the prohibition element 6 to the source 7 of the light pulses. When, reaching and the critical frequency of light flashes, the subject presses button 2. In the reverse counter 3, the number of counting pulses corresponding to the critical frequency is not recorded, no trickles. iS & 0 DO 00 About SP

Description

The invention relates to medical technology and can be used in psycho-physiological research.

The purpose of the invention is to reduce the study time by adjusting the duration, repeated measurement cycles of the parameters of the driving circuits.

The drawing shows the functional scheme of the device.

The device for measuring the critical frequency of the flicker fusion contains a series-connected pulse generator 1, the first prohibition element 2, a reversible counter 3, a digital-analog converter 4, a voltage-frequency converter 5, a second prohibition element 6, a source of 7 light pulses, a recorder 8, the input of which is connected to the output of a voltage-frequency converter 5, serially connected to the test button 9, element 10 OR, trigger 11, first element 12 AND, second element 13 AND, subtractive counter 14 AND, and also a group 15 2-2 and 2IL elements, the outputs of which are connected to the information inputs of the detracting counter 14, the first inputs to the second input of the element 10 OR and the transfer output to the high-order bit of the reversing counter 3, the second inputs to the first input of the element 10 OR, and button 9 the subject, the third inputs - with the bus 16 installation code duration of the first pause, the fourth inputs - with the bus 17 installation code duration of the second pause, and the output of the trigger 11 is connected to the second inputs of the first element 2 of the ban, the second element 6 of the ban and the second element 13 I.

The device works as follows.

The subject is presented with a source of light pulses with a discretely through 1 Hz variable flicker frequency value, starting with a frequency that is known to be lower than the critical one, for example, 20 Hz. Dp of shortening the test time and reducing the errors caused by the test subject's fatigue, repeated tests are carried out with the value of rc 4, cm1- -

In the initial position, the trigger 11 is in the zero state, with the prohibition elements 2 and 6 open, and the elements 11 and 13 are closed. The impulses from the generator 1 through the element 2 are fed to the summing input reversive0

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3. From the output of the reversible counter, the signal in the parallel code is fed to the input of the digital-to-analog converter 4, from the output of which a step-by-step voltage is applied to the input of the converter 5, voltage - frequency.

The pulses of the measuring frequency hfc are supplied from the output of the transducer 5 voltage - the frequency to the input of the recorder 8 and through the element 6 of the prohibition on the source 7 of the light pulses.

When the critical frequency of light flashes is reached, the subject presses button 2. Reversing counter 3 records the number of counting pulses corresponding to P ,,. ,,.

Pressing button 9 provides a feed through a group of 15 elements 2-2 and 2IL to information inputs of a downlink counter 14 of a parallel pause length code from bus 16. At the same time, the signal from button 9 through an OR 10 element sets trigger 11 to one and ensures that the duration code is written to information bits of the subtracting counter 14. The signal from trigger 11 closes prohibition elements 2 and 6. As a result, the light pulse source 7 stops operation, and the pulses flow to the summing input of the reversible counter 3. The registrar 8 shows the value of the critical flicker frequency determined by the subjects. At the same time the signal from the output of the trigger 11 opens the elements And 12 and 13, the counting pulses begin to flow to the subtractive input of the reversing counter 3 and to the counting input of the subtractive counter 14.

At the end of the pause, the duration of which is determined by the code recorded in subtractive counter 14, a pulse is formed at its exit from the high bit, which sets trigger 11 to the zero state.

The device enters the initial state with the difference that in the reversible counter 3 a number is already recorded that determines the new initial frequency of flickering, which is less by 3-5 Hz recorded in the previous test of the critical flicker frequency.

If for some reason the subject does not press button 9, the overflow counter 3 overflows,

313333054

at the output of the transfer to the senior discharge, the output of the first element AND a pulse is generated, which provides one with the second input of the reversing feed to the information inputs of the calculator, and the second input is connected to the melting counter 14 through the group of the output pulse 2; -2И-2ИЛИ 15 duration codes Swarm the input of the element OR is connected to the bus from the bus 17 to the duration of the pause. Transfer of the input to the highest bit of the re- signal from the output of the transfer of the reversive-counter counter that distinguishes the counter 3 through the element OR 10 with what New abbreviation - sets the trigger 11 in a unit or in the study time by adjusting the state, thereby recording the duration of the repeated cycles of the pause duration in the measurement information, the subtractive bits of the subtracting counter 14, the group elements 2-2I- Next, the operation of the device is carried out by 2ILIs and the second AND elements, one of the inputs from the initial state is similar, the sources of which are connected to the output of the generator described above and the second input of the first element AND connection input the inventive formula is with a trigger output, the output of the second

element and connected to the counting input

A device for measuring the critical subtractive counter, the setting of the frequency of the flicker, the co-input of which is connected to the first input of the trigger and the output of the OR, pulse generator, the first element of the output of the high-level interdiction, the reversing counter digital-to-second trigger input, and information-to-analog converter; 25 output transducers - with outputs of a voltage cell group - frequency, 2-2I-2Sh1I followers, the first inputs of a prohibition element, the source of light connected to the second input of the pulses, serially connected-OR, and to the transfer output to the test button’s old button, the element OR, the discharge counter of the reversible counter, the second flip-flop, the first element AND, and the other inputs - with the first input of the recorder The input of which is connected, the third inputs are connected to the installation bus with the converter output — the code of the first pause duration and the frequency — and the trigger output connectors are connected to the code installation bus with the second inputs of the second pause.

Claims (3)

Claim A device for measuring the critical fusion flicker frequency, comprising a pulse generator, a first inhibit element, a reverse counter, a digital-analog converter, a voltage-frequency converter, a second inhibit element, a light pulse source, a test button connected in series, an OR element, a trigger, and the first AND element as well as a recorder whose input is connected to the output of the voltage-frequency converter, and the trigger output is connected to the second inputs of the elements a, the output of the first AND element is connected to the second input of the reversible counter, and the second input is connected to the output of the pulse generator, the second input of the OR element is connected to the transfer output to the upper bit of the reverse counter, characterized in that, in order to reduce the study time by adjusting the duration of repeated measurement cycles, a subtracting counter, a group of elements are introduced into it 2-2I2OR and the second element And, one of the inputs of which is connected to the output of the pulse generator and the second input of the first element And, and the second input is connected to the output of the trigger, the output of the second element And is connected to the counting input of the subtracting counter, the installation input of which is connected to the first input -the trigger house and the output of the OR element, the loan exit from the senior level with the second trigger input, and the informational outputs ₅ and ₅ with the outputs of the 2-2I-2OR element group, the first inputs of which are connected to the second input of the OR element and with the output transfer to senior 1st digit of the reverse counter, second inputs - with the first input of the element 3 ° OR, the third inputs are with the bus for setting the code for the duration of the first pause, and the fourth inputs are with the bus for setting the code for the duration of the second pause.