SU1432604A1 - Device for monitoring errors of multichannel magnetic recording apparatus - Google Patents

Abstract

The invention makes it possible to increase the reliability and simplify the device for monitoring the errors of the multichannel magnetic recording apparatus 1. The device contains generator 2, shaper 3 codes, inverters 4-7, registers 8-10, group of adders 11

Description

modulo two, adder 12 modulo two, electronic switch 13, element I 14, triggers 15, 16, gating element 17, error counter 18, clock counter 19, and indicator 20. The invention is achieved by isolating errors by element-by-element comparison on adders 11 reproducible signals with a corresponding inverted or non-inverted pilot signal, generated by one common to all channels, a control pseudo-random sequential generator, consisting of a shift register 10 and adder 12 and a automatically entered into synchronism with the reproduced signal of one of the channels of the device

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1 using the switch 13, the trigger 15 and the element And 14, the signal in: and all the inputs of which at the same time can be present only in the absence of synchronism. Upon reaching synchronism between reproducible and control signals, the output of the score; Chip 19 generates a signal level difference that resets trigger trigger 15. Signals on this column, generated on the inputs of adders 11, are written to register 8, from which they are successively output to error counter 18 at high intervals in the time interval between adjacent sync pulses. playback. 1 il.

one

The invention relates to instrumentation, in particular to a magnetic recording technique, and can be used as an error control equipment for parallel magnetic recording-reproduction of digital information signals.

The purpose of the invention is to increase reliability and simplify the device.

The drawing shows a functional diagram of the proposed device.

A device for monitoring errors of a multichannel magnetic recording-reproduction apparatus 1 contains a back-up oscillator 2, a shaper 3 codes, the first 4, the second -5, the third 6 and the fourth 7 inverters, the first B, the second 9 and the third 10 registers, a group of adders 11 modulo two modulo two additional adder 12, switch 13, element 14, first 15 and second 16 flip-flops, gate element 17, first 18 (error counter) and second 19 (additional) counters and indicator 20

The first output of the generator 2 is the high-frequency signal output connected to the clock input of the control input of the serial information output of the register 8, with the second 3-A signal of the element strobe

17 gating and; inverter input, the output of which is connected to the second input - clock input C of the D-flip-flop 16 "The second output sets the generator 2 - the clock signal output is connected to the recording clock input of the magnetic recording device 1 and to the input of the shaper 3 of the output code of which is connected with the first group of informational inputs-inputs of odd-numbered recording channels of magnetic recording apparatus 1 and with the input of inverter 4, the output of which is connected to the second group of informational inputs-inputs of even channels: recording device 1 of magnetic recording info The memory outputs / outputs of the playback signals of the magnetic recording apparatus 1 are connected to the information inputs of the register 9, the outputs of which are connected to the first inputs of the adders 11 modulo two.

In addition, the first output of the register 9 is connected to the second signal input of the switch 13. The outputs of the adders 11 modulo two connections to the information inputs of the register 8 and the inputs of the multi-input element I 14, the output of which is connected to the first input - information input P of Prygger 15, output which is connected to the control input of the switch 13, to the register 8, which is set to the zero state, and to the indicator input 20. The output of the sync signal of the magnetic recording apparatus 1 is connected to the control input of the parallel input The information register 9, the clock input of the register 10 shift and the input of the inverter 6, the output of which is connected to the counting input of the counter 19, the second, the input - the clock input C of the trigger 15 and the first input - the information input D of the trigger 16. The output of the trigger 16 is connected to the input controlling the parallel input of information of register 8, the output of which is connected to the first signal input of the gate element 17, the output of which is connected to the counting input of the error counter 18. The output of the switch 13 is connected to the information input of the register 10, the outputs of the two corresponding bits of which are connected to the inputs of the adder 12 modulo two, the output of which is connected to the second inputs of the first part of the odd group of adders 11

modulo two, the first signal input is 30 standard autogenerator sequence of switch 13 and the inversion input of rectangular pulses from pa 5, the output of which is connected to a second frequency of 8 MHz, connected by the output of the second inputs of the second part (even) to the first output generator 2 and input groups of adders 11 modulo two. home of a frequency divider by eight, the output of the Output of the first adder 11 modulo 35 of which is the second output of

generator 2. Thus, the clock frequency of the recording signal is 1 MHz. The frequency of the high-frequency signal generated at the first output of a given oscillator 2 must be higher than the clock frequency of the recording signals (input to the inputs of apparatus 1) at least n + 1 times, where n is the number of recording-playback channels

two are connected, in addition, to the installation in the zero state by the input of the counter 19, the output of which is connected to the third, installation in the zero state, the input of the trigger 15.

Magnetic recording apparatus 1 is a multichannel apparatus for parallel magnetic recording (and reproduction) of high density digital signals on a magnetic tape. 45 monitored apparatus 1 magnetic In this case apparatus 1 contains an input record ,. This condition provides a parallel recording system, implements the introduction of special markers into the information signal of each channel to eliminate column skews during playback, and error-correcting coding for the purpose of subsequent detection and correction of errors in playback information sequences; a multichannel sequential recording system in which channel coding is performed in accordance with a selected recording method, a multi-channel sequential reproduction system in which channel-by-channel correction and generation of a reproduction signal and generation of a channel sync signal, a parallel reproduction system that performs temporal reproduction of reproduced signals from different tracks using markers entered during recording, as well as error detection and correction.

The information signals to the recording inputs of apparatus 1 are given in the potential BVN code (without returning to zero}, in which symbol 1 corresponds to a high level and symbol O indicates a low voltage level. Information symbols on the recording come in the form of a sequence of columns, i.e. in a parallel code with a sync pulse accompanying each column.The playback information signals are received from the outputs of apparatus 1, also in the potential BVN code with the sync pulse playing each information symbol Keeping.

The master oscillator 2 contains

A standard auto-generator of a series of rectangular pulses with a frequency of 8 MHz, connected by an output to the first output of generator 2 and the input of a frequency divider to eight, the output of which is the second output of

generator 2. Thus, the clock frequency of the recording signal is 1 MHz. The frequency of the high-frequency signal generated at the first output of a given oscillator 2 must be higher than the clock frequency of the recording signals (arriving at the inputs of apparatus 1) at least n + 1 times, where n is the number of recording-playback channels

An experimental error output of all channels of a given column from register 8 for the time interval between adjacent playback clock pulses.

The shaper 3 code forms in a known manner the test signal in the form of a pseudo-random sequence of characters. The clock input and the output of this shift register are the input and output of the driver 3, respectively.

Triggers 15 and 16 are D-triggers. Counter module 19

At least twice as many as the register bits 10. Gating element 17 is made on a two-input element And, one of the inputs to which is connected via an inverter to the gating input of element 17.

The device works as follows.

The shaper 3 codes generates a test signal in the form of a pseudo-from the guchaynyh sequence of characters, which directly arrives at the inputs of the odd (1, 3, 5, and 7th channels) recording apparatus K At the inputs of the h; etny (2, 4 and) channels The recording unit 1 receives an inverted pseudo-random sequence from the output of the inverter 4. Information is entered into the magnetic recording device using the clock synchro pulses generated on the second pincode of the master oscillator 2 and promoting the same signals in the shift register of the imaging unit 3 codes.

The signals of this column reproduced by the apparatus 1 are recorded in the buffer, register 9, on the front of their sync playback pulse.

Monitoring of playback errors of each channel of magnetic recording apparatus 1 is performed by element-wise comparison on adders 11 through. Module two (number of adders 11

in the device, it is equal to the number of channels that are confused vertically pseudo-random after .le.

the apparatus being filled; reproducibility from the inverter output 5.

The errors allocated by adders 11 are fed to the information inputs of the edited pseudo-random sequence of each channel with the corresponding (i.e., inverted or non-injected; Gistr has 8 errors and entered into this

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vertically) control pseudo-slave-40 by the trigger signal 16, which is a sequence, a shift register 10 and an adder 12 modulo two. In this case, a control pseudo-random sequence should be formed synchronously with the reproducible.

In the absence of synchronism (at the initial moment of error monitoring, if a playback clock fails), the output of the trigger 15 of the command is 15, which turns on the indicator 20 and, if present, the electronic switch 13 provides

information input of the register 10 VOID about the presence of errors, the output pseudo-random sequence gg in the BVN code from register 8, the correlation of the first channel by the paraparametric high-frequency drops 1. With an error-free reproduction of the generator 2 signal, the output of the scientific research institute the signal over this channel through the gate element 17 forms seven clock cycles (according to the size of the error pulses, which the counted is synchronized by the output high-frequency signal of the master oscillator 2. The trigger 16 switches when Alice at its high level information input clock signal reproduction at the moment of arrival of the corresponding frequency generator signal edge 2, wherein the output signal levels drop trigge- -50 P performs a write to the register 8 vyhodngh adders error signal 11.

register 10) the formation of errors at the output of the adder 11 is terminated.

The installation input of the counter 19 and the output of the latter after some time (determined by the counting module of the counter 19, the counting input of which receives playback clock from the output of the inverter 6) generates a signal that sets the zero state to zero. There is no signal for the trigger trigger 15, as a result of which the indicator 20 goes out, and the switch 13 connects the information input of the register 10 to the output of the adder 12. Automatic synchronization of the reproduced pseudo-random sequence and the control ends, and the error control process begins.

During the input of the measuring part of the device to synchronism, the output signal of the trigger 15 holds the register of 8 errors in the zero state, and the luminous indicator 20 indicates a blocking error.

Modulo two of the first pseudo-random sequence to the first, third, and seventh adders come directly from the output of adder 12, and the second, fourth, and sixth adders 11 go to; Gistra has 8 errors and is entered into this

Error counter 18 is displayed and displayed.

A sign of lack of synchronism between the reproducible pseudo-random sequence and the control one is the simultaneous generation of error signals at the outputs of all adders 11 modulo two. In this case, a signal is generated at the output of the And 14 element, which is fed to the information input D of the trigger 15. The latter switches on the next step (i.e. after writing the information to the register 9) by the differential of the level of the clock signal, and the device starts to synchronize automatically. .

Claims (1)

Invention Formula A device for monitoring errors of a multichannel magnetic recording apparatus, containing generator orders, is first connected to the control input of the serial output of the first register, the output of which is connected to the error counter via a gating element, the second input connected to the first output of the master oscillator, a swarm whose output is connected to the input of the code generator and to the recording clock input of the magnetic recording apparatus, information outputs and the output of the playback clock signal of which connected to the informational book and the clock inputs of the second register, the outputs of which are connected to the first inputs of the adder modulo two group, an additional modulo two adder, connected to the outputs of the third register, and the element And five 0 5 0 Q five e so that, in order to increase the reliability and simplify the device, a switch is inserted into it, signal inputs connected to the first output of the second register and the output of an additional modulo two $ terminal and the output connected to the information input of the third register, the first trigger, output connected to the control input of the switch and the setup input of the first register, the second trigger, the output connected to the control input of the parallel input of the first register, the second counter, inverters and indicator, Yunenny to the output of the first trigger, while the output code generator directly and through the first inverter is connected to the information inputs of the magnetic disk apparatus, the output of the additional modulo two is directly and via the second inverter connected to the second inputs of the group of modulo adders two, the outputs of which are connected with the information inputs of the first register and through the element I with the first input of the first trigger, the output of the playback clock signal of the magnetic recording apparatus is connected to the clock input of the third register and through the third inverter with the second input of the first trigger, the counting input of the second counter and the first input of the second trigger, the first output of the master oscillator is connected via the fourth inverter to the second input of the second trigger, and the setup input to the output of the second counter, respectively, connected to the output of the first adder modulo two and to the third input of the first trigger.