SU1408455A1 - Device for reproducing digital information from magnetic record carrier - Google Patents

Abstract

The invention relates to the field of information accumulation. The purpose of the invention is to keep the information content of the reproduced information. The device contains magn. playback head, playback amplifier 2, registers 4, 5, conversion unit 6, digital-to-analog converter 7, clock detection block 8, AND 9 element, pulse driver unit 10, code adder 11, voltage adder 12, key elements 13 and 14, buses 15 and 16, switch 17, registration unit 18. Introduction of trigger 20, conversion unit 21, blocks 22 and 23 of voltage dividers, switch 24, limiter 25, subtractive unit 26, block 27 of threshold elements, adder 28 of the voltage of the elements OR 29 and 30, resistor 31 and digital-analogue converter 32 and the formation of new The connection between the elements of the device allows to obtain a video signal that is displayed on the recording medium in the form of a three-dimensional quasi-three-dimensional image, the equipotential lines of which are selected in a predetermined sub-band recorded on the magnet. video signal carrier and correspond to the single values of the physical parameter. 1 il. I (L

Description

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The invention relates to the field of Accumulation of information, namely, devices for reproducing digital information from a recorder of magnetic recording.

I The aim of the invention is to increase the informativity of the reproduced information by registering the reproduction result in the form of 13 images quantized in given subbands of the video signal. I The drawing shows a functional diagram of a device for reproducing digital information from a magnetic recording medium.

A device for reproducing digital information from a magnetic recording medium contains serially connected playback magnetic head 1, playback amplifier 2 and information recovery unit 3 connected by an information output to the information input of the first register 4 connected by inputs to the second register 5 connected by a synchronization input through the first conversion unit 6 to the synchronization output of the information recovery unit 3 and the input of the first register 4 and outputs to the input This analogue converter 7, block 8, detection of sync pulse coBj, element 9, block 10 of pulse formers, S ss {mat 11 codes, first sum 12 voltage regulator 12, connected by inputs to the outputs of the first and second key elements 13 and 14 connected by control inputs with first and second tires 15 and 16 constant voltage. The first sum of 12 voltages is also connected by an output to one contact of the first switch 17, which is connected by an overtaking contact to the output of registration unit 1.

The device also contains a third bus 19, a constant voltage 5thrigger 20, a second conversion unit 21, the first and second blocks 22 and 23 of voltage dividers, a second switch 24, a two-way limiter 25, a subtractor1–1Y block 26, a block 27 of threshold elements, the second accumulator 28 voltages, the first and second elements OR 29 and 30 and serially connected TpeTHJi i register 31 and the second digital-to-analog converter 32, connected by the output through the first block

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22 voltage dividers to the contacts of the second switch 24, the switchable contacts of which are connected to the inputs of the double-sided limiter 25 and the subtractive unit 26 connected by output through the second block 23 voltage dividers to the same inputs of the block 27 threshold elements. The threshold element block 27 is connected by other inputs to the outputs of a two-way limiter 25 connected by one of the inputs to the output of the first single-analog converter 7, and connected by outputs to the inputs of the second voltage adder 28 connected to the other contact of the first switch 17, and to the inputs

- unit 10 of pulse shapers connected by one output to the inputs of the first element OR 29 and other outputs to the inputs of the second element OR 30 connected to the inputs of the first and second key elements 13 and 14. The first adder 12 is connected by one of the inputs to the third bus 19 constant voltage, block 8 detection of sync pulses connected information. inputs to the outputs of the second register 5 and inputs of the adder 11 codes, the synchronizing input to the output of the first conversion unit 6 and output to the one input of the trigger 20 connected by output to one input of the element And 9. The element 9 is connected to another input with the output of the first block 6 conversion and output from the control input from the mmator 11 codes and with the input of the second conversion unit 21 connected by the output to another input of the trigger 20 and to the control input of the third register 31 connected by inputs to the outputs of the adder 11 codes. The device works as follows.

The signals reproduced by magnetic head 1 are amplified by an amplifier.

, 2 reproductions and arrive at information recovery unit 3, which supplies code and synchronization pulses to its separate outputs, arriving on the first register 4, Synxxpv, the other pulses are counted by the first conversion unit 6, the coefficient ({recalculation factor of which is set to bits allocated for the city of the reference of the video source when it is recorded. Exit im15

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the pulse of the first conversion unit register code 4 is transmitted to the second register 5. The code from the outputs of the second register 5 is fed to the block 8 of the detection of synchronizing pulses of rows, to the adder 11 codes and the first digital-analog converter 7. Block

8, the detection of sync pulses determines the presence of a synchronizing pulse of a Q pulse of the row, after which the trigger 20 overturns. At the same time, the output pulses of the first conversion unit 6 through the AND 9 element arrive at the control input of the adder 11 of codes, which during the time specified by the second block 21 conversions, averages out the readings of the service information following the synchronizing pulse of the scanned space in the infrared range of the radiation. Therefore, an averaged overhead value is transmitted to the third register 31, according to

which is subsequently quantized the reproduced signal. Transformed, in the form of a constant voltage for a given string. video signal using the second digital-to-analog converter 32, the signal is fed to voltage dividers 22, the division factors of which correspond to the values of the video quantization subbands. Using the second switch 24, two 35 dividers 22 are connected to the subtracting unit 26 in accordance with the selected subband. The output signal of the subtracting unit 26 is supplied to voltage dividers 23, the number and division ratio of which determine the video quantization scale, based on, for example,

modulation factor of the original video signal from the temperature of the observed area. The threshold levels obtained in this way arrive at the threshold elements 27, whose information inputs are affected by the video signal voltage from the output of the first digital-to-analogue converter 50 bodies 7, bounded above and below in a given sub-band using a two-way limiter 25. The input signals of the elements 27 are summed by the second adder 28 voltages and 55 thus obtained quantized voltage through the switch 27 is fed to the amplifier 33 of the block

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18 registering the image onto the carrier 34 fixed to the unwrapping drum 35. When the first switch 17 is in a different position, the image 35 appears in the form of black and white equipotential lines formed by relative threshold levels. separate outputs pulses according to the direction of change of input signals. The pulses of positive changes are collected by the first element OR 29, and the pulses of negative ones - by the second element of the IPD 30. The output signals of the first and second elements OR 29 and 30 are sent to the key elements 13 and 14,

Tires 15 and 16 are respectively supplied with positive and negative voltages. Therefore, the output pulses of the positive polarity of the key element 15 correspond to the intersections of the video signal from the output of the first digital signal converter 7 threshold levels of voltage dividers 23 with a positive derivative sign, and the output pulses of the negative polarity of the key element 14 to the intersections with a negative derivative sign. Using the first adder 12 voltages, both pulse sequences are converted into one total, which is shifted to the amplitude of the negative pulses using a constant voltage supplied via bus 19, the video signal received in this way is displayed on the recording medium 29 in the form of a quasi-three-dimensional image, the equipotential lines of which produced in a predetermined sub-band of a video signal recorded on a magnetic carrier and correspond to specified values of a physical parameter, for example, radiation topics perature.

Claims (1)

Invention Formula A device for reproducing digital information from a magnetic recording medium containing serially connected magnetic reproduction head, reproduction amplifier and information recovery unit connected by an information output to an information input the first register connected by passages to the inputs of the second register connected by the synchronization input through the first conversion unit to the synchronization output of the information recovery unit and the input of the first register and outputs to the inputs of the first digital-analog converter, the sync pulse detection unit; pulses, element I, unit pulse generator, code adder, first voltage adder, connected; inputs to the outputs of the first and second I key elements connected by control inputs from the first and second buses and a constant voltage, and an output connected to one contact of the first switch connected by a switchable contact to the input I of the registration unit, as well as a third bus on a constant voltage, that is, so that increasing the information content of the reproduced information by recording the result of the playback as an image quantized in the data I subbands of the video signal, a trigger is entered in it, the second block I is converted, the first and second blocks of voltage dividers, the second switch, two sided limiter, a subtracting unit, a threshold elements, a second voltage adder, the first: and second elements connected in series and Hilti third register and a second digital to analog converter, connected via output of the first voltage divider unit to the contacts of the second change-over switches 08455 10 15 th 20; 25 thirty 35 tel. whose switchable contacts are connected to the inputs of a double-sided limiter and a subtractive unit connected by an output through the second block of voltage dividers to one input of a block of threshold elements connected by other inputs to the output of a double-sided limiter connected by one of the inputs to the output of the first D / A converter and connected to the outputs the inputs of the second voltage adder connected by the output to the other contact of the first switch 5 and with the inputs of the pulse shaper unit, n connected by one outputs to the inputs of the first element OR and other outputs to the inputs of the second element OR connected to the inputs of the first and second key elements, the first voltage adder connected by one of the inputs to the third DC bus, the sync pulse detection unit is connected to information inputs the outputs of the second register and the inputs of the adder codes, synchronizing input - to the output of the first unit of conversion and output - to one input of the trigger connected by the output to one input of the And element, connected by another input to the output of the first conversion unit and output - to the control input of the code adder and to the input of the second conversion unit connected by the output to another trigger input and control input of the third register connected by inputs to the output of the code adder.