SU970441A1 - Device for digital data magnetic recording and reproducing - Google Patents

Description

The invention relates to instrumentation and can be used in information recording equipment.

A digital recording and reproducing apparatus is known comprising a tape drive, recording and reproducing amplifiers, a shift register, a counter, an AND {1 circuit.

The device records information zonaksh, and the zone number with a serial code on a separate dorokke, at. In this case, the storage capacitor is used incompletely. Reliability of information recognition by the zone number is low as a result of the code distortion of the zone number code in the event of a signal falling out when reading from a magnetic leite.

A device is known for entering iy. formations containing a drive, Tfwrrep, first and second registers, comparing and rewriting circuits, a processing device and ensuring the allocation of the zone number at the time of arrival of the service pulse recorded on a separate track 2.

In this device, the capacity of the storage device is used more efficiently, but the reliability of information recognition by the zone number is very high, since the fallouts lead to distortion of the zone number code and the service pulse.

The closest in technical essence to the present invention is a device for recording and reproducing digital information comprising a storage device, an information source, a recording synchronization unit, a recording unit,

10 a zone code generator, a source of a logic unit and block reproduction level, comprising zone recognition. A zone code is recorded in a parallel 9-bit code in the device, with one of the rows being the check code for the odd code. The selection of the area code from the information is produced by counting the sync pulses of the strings,

20a, an increase in the reliability of the area code is achieved by detecting errors with (with an odd-ness code and error correction with ps (global cyclic codes {3.

25

However, the reliability of information recognition by zone number is low due to the following reasons.

The loss of the signal at the output of the magnetic tape drive is due to the need for recording processes

30 and playback, with the single errors 8 parallel to the recording line and grouping along the recording track most likely to be the most likely. When recording in the information zone, often embedded code words containing only one binary unit, the loss of which leads to a sync pulse of the line, and, consequently, to an incorrect allocation of the area code. Cyclic codes allow you to correct errors that occur only during playback, and for correction, you need to return and repeat the area code, which is unacceptable for drives without a start-up driving mode and increases the sampling time of information. The purpose of the invention is to increase the reliability of information recognition. This goal is achieved in that a device containing an information source, a recording synchronization unit, a zone code generation unit connected in series to a recording unit, a tape drive and a playback unit including a zone recognition circuit, as well as a control unit connected to the playback units and forming the area code, the frequency divider has been entered, the inputs of which are connected to the outputs of the information source and the control unit, and the output to the other inputs of the area code generator and the write synchronization unit C, the multiplexer, the output of which is connected to the input of the recording unit, and the first, second, third and fourth inputs - to the outputs of the recording synchronization unit, the zone code generator, the information source and the control unit, respectively, the interband interval selection unit whose input is connected to the accumulator output, and the output is with a different input of the playback unit. In this case, the interband interval allocation unit contains the first and second OR circuits, a trigger, the counting input of the kotorhgo is connected to the output of the first OR circuit, two parallel circuits of a series-connected integrator, a threshold element and a capacitor, whose inputs are connected to the trigger outputs, and the outputs are from Dami second scheme OR. In addition, the zone recognition circuit contains an OR circuit group, an OR circuit, an encoder whose inputs are connected to the outputs of the OR circuit group and to the OR circuit inputs, the first trigger, the forwarder, the delay element, the one-shot and the first circuit AND, the second trigger, to the output of which is connected to one of the outputs of the second AND circuit, the binary counter, the information inputs of which are connected to the outputs of the encoder, the control input to the output of the second AND circuit, and the counting input to the output of the delay element, and the other inputs of the first and second th AND gates respectively connected to the output of the OR circuit and the output of one-shot. FIG. 1 shows the structural scheme of the proposed device; in fig. 2-4 are electric circuits of two bits of a multiplexer, an interband interval allocation unit and a zone recognition circuit, respectively; in fig. 5 and 6 are diagrams of signals at the outputs of the information source and multiplexer, respectively. The device contains (Fig. 1) information source 1, frequency divider 2, control block 3, zone code generator 4, recording synchronization block 5, multiplexer 6, recording block 7, magnetic tape drive 8, interband interval extracting unit 9, block 10 The reproduction, the zone recognition circuit 11, the divider 2, the driver 4 and block 5 are performed on binary counters, and two bits of the multiplexer 6 are executed in ZI-OR 12 circuits (Fig. 2). The interband interval allocation unit (Fig. 3) contains the first multi-input, for example, 9-input circuit OR 13, flip-flop 14, integrator 15, driver 16, capacitor 17, second OR circuit 18, integrator 19, driver 20, capacitor 21. Zone recognition circuit (Fig. 4) contains the first trigger 22, driver 23, a group of circuits OR 24, delay element 25, circuit OR 26, encoder 27, one-shot 28, second trigger 29, second circuit AND 30, binary counter 31, and first circuit 32. Information in the form of a parallel, for example, 9-bit, code from the output of the source 1 information and goes to the third, information input of multiplexer 6. Zone sync (PPE) and line (SIS) from the output of information source 1 is fed to the input of block 5, and the PPE to the input of divider 2, from which output the PPE pulses with a frequency n times less where n is the division factor of divider 2, is fed to the input of a forger 4 and another input of block 5. From the output of the forcing driver 4, a parallel area code, for example, 4-bit, is fed to the second, information input of the multiplexer b, the fourth information input of which receives a signal units from block 3. Impulse The control signals from the output of block 5 are fed to the first control input of the multiplexer 6. From the output of the multiplexer 6, information flows through block 7 to the accumulator 8, from the output of which is parallel, for example, the 9-bit code and the SIS are fed to the inputs of blocks 10 and 9 , from the output of block 9, the interband interval clock (SIMI) is sent to another input of block 10. From the output of block 3, a pulse command is written to the other inputs of the divider 2 and fororizer 4, and the Start command to the other input of the block 10. To increase the reliability of information recognition in at troystve each discharge area code number Re cording syvaets simultaneously on a 2-spaced tracks on the tape, the most probable error in recording tnye playback not lead to claim zheniyu zone number. However, with such duplication, the bits are parallel, for example, the 9-bit line will allow to write only 4 bits of the area code, which makes it impossible to record more than 15 zones. Therefore, in the device, the code of the zone is recorded not in every zone, but, for example, after 20, the zone number is determined by the zone code in accordance with the encryption table: Zone code 1 2 3 4 15 Zone number 1 20 40 60 280 Zone number, in which code of the zone is not recorded, it is determined by counting the interband intervals. A reliable selection of interband intervals (MI) is ensured by recording a string of ones at the beginning of the zone and selecting a duration of MI longer than an order of time or more than the recording of code words. When recording, block 3 of the hearth. Record on the pulse of the command of the splitter 2 command and set to on. Former 4. Setting the code From the output of source 1, the parallel 9-bit code goes to multiplexer 6, and the synchro pulses of VIZ and SI to block 5 and divider 2 correspond to the diagram (Fig. 5.), where the first and second lines correspond to 1 and 2 impulses of the SIS are reserved for inserting 1 lines of units into the source information and the lines of the area code are performed on multiplexer 6, the inputs of which are controlled by 1 and 2 impulses of the SIS from block 5. Block 7 in accordance with the information received at its input The tour of which is represented in FIG. 6 generates a signal which is recorded from, and then reproduced by accumulator 8. From the output of the latter, when reproducing information in a form similar to that shown in FIG. 6, enters blocks 9 and 10. In block 9, for forming SIS pulses, all 9 information bits are collected in an OR circuit 13, from the output of which the SIS is fed to the counting input of the trigger 14 and the output of the block. Both outputs, trigger 14, are connected to interband interval (MI) pulse shaping circuits, consisting of integrators 15 and 19, drivers 16 and 20, and capacitors 17 and 21, and input pulses of the circuits are assembled in the OR circuit 18. Driver 18 and 20 are configured on comparators and generate pulses when a certain level of signals is reached at the outputs of the integrators 15 and 20. The presence of two formation circuits makes it possible to isolate the inter-window interval in case of deposition of SIS pulses. Pulses MI, SIS and eight information bits (without a check bit) are fed to circuit 11, trigger 22, to the inputs of which pulses MI and SIS are fed, and shaper 23 on the trailing edge provide the selection of the first pulse of SIS. The delay element 25 and the one-shot 28 FOIME strobe the selection of the second line, in which the area code is recorded. A trigger, 29, to the zero input of which impulses a Start from block 3, and the circuit 32 form the synchronization pulses of the area code read (PPE). Reproducible pulses 1-5, 2-6, 3-7, 4-8 bits are collected in the OR 24 circuits and fed to the encoder 27, which converts / in accordance with the table above, the 4-digit area code into the 9-bit the binary word of the zone number, which is fed to the inputs of the binary counter 31. The pulse is recorded from an OR 26 circuit that collects 4 bits of the area code after gating on the AND 30 circuit by a single vibrator 28. After the tape starts, the PPE pulses begin to form with the arrival the first significant zone code, which after the conversion Neither the encoder 27 sets in the counter 31 a valid zone number. Subsequent zone numbers are phased by adding a unit to the contents of the counter. The arrival of each first SIS pulse in the next zone. Since each bit of a zone code is recorded on two tracks separated on a tape, the errors of the recording and playback processes do not distort the zone code. Intermediate zone numbers are also determined by high reliability, since they are conducted by counting interband intervals that are not subject to distortion during recording and playback. The device provides high reliability of recognition of information in tape drives with both continuous and start-stop modes of tape movement with minimal storage capacity of the drive for recording the area code. The reliability of recognizing the zone number in comparison with the known devices is increased by 2-3 times. The results of experimental studies have shown that the proposed device allows recording and reproducing a digital code; and, for example, on a PD-92 type storage device with a confidence of 10. The economic effect of using the proposed device is defined as a reduction of computer time used for processing information recorded on a magnetic tape, and an increase in the service life of magnetic recording equipment and magnetic media. In the case of large scale scientific research, the volume of savings is expressed by the magnitude increasing in proportion to the intensity of the means of measurement and data processing used. 1. A device for magnetic recording and playback of digital information, formations containing an information source, a recording synchronization unit, a zone code generation unit, successively connected to a recording unit, a tape recorder, and a playback unit, including a zone recognition circuit, and a control unit connected to the unit and the formation of the area code, in order to improve the reliability of information recognition in format recording, a frequency divider, inputs to They are connected to the Outputs of the information source and the control unit, and the output to the other inputs of the source code zone and the synchronization block, the multiplexer whose output is connected to the input of the unit, and the first, second, third and fourth inputs to the outputs of the unit synchronization of the recording, the region code generator, the information source and the control unit, respectively, the allocation layer of the zone interval, the input of which is connected to the drive output, and the output with another input of the playback unit. 2. A device according to claim 1, characterized in that the interband interval allocation unit comprises a first second OR circuit, a trigger, the counting input of which is connected to the output of the OR circuit, two parallel circuits of a series-connected integrator, a threshold element and a capacitor whose inputs are connected to the outputs tripper, and the outputs - with the inputs of the second circuit OR. 3. The device according to claim 1, characterized in that the zone recognition circuit comprises an OR circuit group, an OR circuit, an encoder whose inputs are connected to the outputs of the OR circuit group and to the OR circuit inputs, a first trigger, a driver, a delay element, a single vibrator and the first circuit And, the second trigger, the output of which is connected to one of the inputs of the second circuit And, a binary counter, the information inputs of which are connected to the outputs of the encoder, the control input - with the output of the second circuit And, and the counting input - with than the other inputs of the first and second circuits AND are connected respectively to the output of the system OR or the output of one vibrator. Sources of information, 4, accepted; into account prk examination 1.Drozdov E.A. et al. Electronic digital computers, M., Voenizdat, 1968, p. 302. 2. The author's certificate of the USSR 490121, cl. G 06 F 9/04, publ. 10/30/75. 3. Drozdov E.A. et al. Electronic computers of the Unified system, / Mechanical Engineering, 1976, p. 393 (prototype).

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Claims (3)

Claim 1. A device for magnetic recording and reproduction of digital information containing an information source, a recording synchronization unit, a zone code generation unit, sequentially connected recording unit, a magnetic tape drive and a playback unit including a zone recognition circuit, as well as a unit The control connected to the units of the product and the generation of the zone code is characterized by the fact that, in order to increase the reliability of recognition of information during format recording, a frequency divider is introduced into it, the inputs of which connected to the outputs of the information source and the control unit, and the output to the other inputs of the zone code generator and the recording synchronization unit, a multiplexer whose output is connected to the input of the recording unit, and the first, second, third and fourth inputs - to the outputs of the recording synchronization unit, shaper the aeon code, information source of the ith control unit, respectively, the interzone interval allocation unit, the input of which is connected to the drive output, and the output to the other input of the playback unit. 2. The device pop. 1, characterized in that the block of separation of the interband interval contains the first and second OR circuits, a trigger, the counting input of which is connected to the output of the first OR circuit, two parallel circuits of series-connected integrator, threshold element and capacitor, the inputs of which are connected by the trigger outputs, and the outputs are with inputs of the second OR circuit. 3. The device according to π. 1, characterized in that the zone recognition circuit contains a group of OR circuits, an OR circuit, an encoder, the inputs of which are connected to the outputs of a group of OR circuits and with the inputs of an OR circuit, the first trigger, driver, delay element, one-shot and the first And circuit, sequentially connected, the second a trigger, to the output of which one of the inputs of the second AND circuit is connected, a binary counter, the information inputs of which are connected to the outputs of the encoder, the control input - with the output of the second AND circuit, and the counting input - with the output of the delay element, the other inputs being oh and second AND gates respectively connected to the output of OR circuit and a monostable output.