SU1205191A1 - Device for checking magnetic record - Google Patents

Description

- The invention relates to the field of accumulation of information, namely, devices for controlling magnetic recording.

The aim of the invention is to improve the accuracy of control of magnetic recording,

Figures 1 and 2 depict one of the possible variants of the proposed device for controlling magnetic recording.

The device contains a pulse generator 1, connected to the input of the code signal generator 2 and to the input of the time separation unit 3 j, which is connected to the outputs of the error separation 4 blocks and connected to the outputs through the OR element 5 with the counter input 6, a synchronizer 7 equipped with AND 8 and the first, second and third triggers 9, 10 and 11j and the recording-reproduction unit 12, consisting of recording amplifiers 13, recording heads 14, magnetic tape 15, reproducing heads 16 and playback amplifiers 1-7. At the same time, in the recording-reproducing unit 12, the outputs of the recording amplifiers 13 are connected to recording heads 14; which are connected to a movable magnetic tape 15, also connected to reproduction heads 16 connected to the inputs of playback amplifiers 17

The device also contains a modulator 18 connected by the first and second inputs respectively to the output of the code signal generator 2 and to the pulse generator 1 and connected by an output to the inputs of the recording-playback unit 12 coinciding with the inputs of the recording amplifiers 13 and demodulators 19. The synchronizer 7 is equipped with selectors of 20 edges, the inputs of which are connected to the outputs of the recording-playback unit 12 coinciding with the outputs of the playback amplifiers 17, the first and second additional elements 11PI 21 and 22 and the first, second and third additional counters 23, 24 and 25. When, this selector 20 inputs connected to outputs of front section 12 of the recording-reproducing medium stvom Shin 26. Counting input of the first additional counter 23 is connected by means of tires 27 to the generator 1 pulses. First trigger 9

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connected by direct output via bus 28 to clock inputs of error extracting units 4 and to synchronization inputs of demodulators 19. 7 modules 19 are connected by outputs to information inputs of error allocating blocks 4 and connected by information inputs to recording / playback output 12 o The outputs of the selectors of the 20 edges are connected via the first additional element OR 21 to the first input of the element AND 8 connected by an inverse output to the first input of the second trigger 10 and connected to the zero input by the direct output the second additional counter 24, to the first input of the first trigger .9 and to the pre-installation input of the first additional counter 23; The first, second and third outputs of the first additional counter 23 are connected respectively to the counting input of the third additional counter 25, to the first input of the third trigger 11 and the second input of the first trigger 9, connected by an inverse output to the counting input of the second additional counter 24. The output of the second additional counter 24 is connected to its input of the prohibition of the account and the connection n with the first input of the second additional element VDI 22. The second additional element liJIH 22 is connected by a second input to the output of the third additional counter 25 and is connected to the second input of the third trigger 11 and to the second input of the second trigger 10. The second trigger 10 is connected by the third input to the direct output the third trigger 11 and the output is connected to the second input element Inc. input zero installation of the third additional counter 25.

The control of magnetic recording through the proposed device is as follows.

The shaper 2 of the code signal from the clock signal of the pulse generator 1 generates a test pseudo-random sequence of 1-1 pulses arriving at the modulator 3, the latter generates a control phase-modulated signal, which is a code alternation of long time intervals and pairs of short time intervals. The control signal is recorded on a floating magnetic tape.

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15 and reproduced from it by the reproduction-recording unit 12. The reproduced control phase-modulated signals from the outputs of the recording-playback unit 1 are fed to the information inputs of demodulators 19 and to the inputs of the selectors 20 of the synchronizer fronts 7. The selectors of the 20 fronts form pulses coming through the first additional element OR. 21 to element 8. The first impulse passed through element I. 8 presets the first additional counter 23 and sets the first trigger 9 and the second additional counter 24 to the zero state. Setting the second additional counter 24 to the zero state through the second additional element OR 22 removes the blocking of the second and third triggers 10 and 11 through their second inputs. The falling edge of the first pulse, passed through element 8, the second trigger 10 is set to the zero state. In this case, the And 8 element is locked, preventing the second and third pulses from passing through it, and the third additional counter 25 begins to count the time intervals of the signal of the first additional counter 23.

From the moment of the occurrence of the first pulse from the AND 8 element in the synchronizer 7, three time intervals are counted. After the first time interval, the third trigger switches.

a ger 11 setting the second trigger 10 to the zero state. The second time interval is formed by presetting the first additional counter 23, the pulses of which switch the first trigger 9 forming the playback clock signal supplied to the clock inputs of the demodulators 19 and the clock inputs of the error extractor 4 . Through the third time interval at the output of the third additional counter 25, an impulse appears that passes through the second additional element OR 22 to the second inputs of the second and third triggers 10 and 11. At the same time, the third trigger 11 is set to the zero state, and the second trigger 10. unlocks the AND 8 element and blocks the third additional counter 25 in the zero state.

The demodulators 19 convert the reproduced control phase-modulated signals from the outputs of the recording-playback unit 12 to the original test pseudo-random signals that are fed to the error division blocks 4. The latter determine the presence of errors in reproducible control phase-modulated signals and generate error pulses. Error pulses after spacing in time by means of block 3 spacing in time pass through the element OR 5 to the counter 6, which ensures their counting.

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Claims (1)

A MAGNETIC RECORDING DEVICE, comprising a pulse generator connected to the input of a code signal generator and to the input of a time diversity block, which is connected to the outputs of error allocation blocks and connected by outputs through an OR element to a counter input, a recording-reproduction unit and a synchronizer equipped with the first , the second and third triggers and the And element, characterized in that, in order to increase the accuracy of control, c. he introduced a modulator connected to the first and second inputs respectively to the output of the code signal generator and to the pulse generator and connected to the inputs of the recording-reproducing unit, and demodulators connected by the outputs to the information inputs of the error highlighting units, and the synchronizer is equipped with edge selectors, the inputs of which are connected with outputs of the recording-playback unit, the first and second additional elements, ORs and the first ”second, and third additional counters, and the outputs of the front selectors They are connected through the first additional OR element to the first input of the AND element connected by the inverse output fc to the first input of the second trigger and connected by a direct output to the ZERO input of the second additional counter, to the first input of the first trigger and to the preset input of the first additional counter, the first, second and the third outputs of which are connected respectively with the counting input of the third additional counter, with the first input of the third trigger and with the second input of the first trigger, connected by an inverse output to the counting input of the second additional counter, the output of which is connected to its counter prohibition input and connected to the first input of the second additional OR element connected by the second input to the output of the third additional counter, and by the output to the second inputs of the second trigger and the third trigger connected by the output with the third input of the second trigger and connected by the output to the second input of the And element and to the zero installation input of the third additional counter, and the information inputs of demodulators connected to the outputs of the recording-playback unit. SU „1205191 eleven