SU860130A1 - Device for checking magnetic recording - Google Patents

Description

(54) DEVICE FOR CONTROL f-lArHHTHOH RECORDS

The invention relates to instrumentation, namely, to monitoring the magnetic recording of digital telemetry data recorders.

It is known a control device used in a digital magnetic recording equipment, which is part of the recording equipment on a fixed magnetic tape, in which a specialized recording head is used, and which cannot function in magnetic recording equipment that does not have such a head {.

The closest in technical essence to the present invention is a device for controlling magnetic recording, comprising an information recording head connected to a storage and data storage unit, an information reproduction head associated with the first input of the comparison unit, the output of which is associated with the first input of the error trigger, clock and recording heads, connected to two inputs of the sync pulse clock control unit, as well as a separate trigger and an OR element.

When recording is performed on a tape through the playback head, the latter is reproduced and fed to one input of the logic element.

Exclusive OR

and on the other

its input enters simultaneously the memory short circuit information. If the bits of the discharge do not match, the Isk.agrochatey1 OREE appears

10 error signal. The receipt of information from the storage device occurs under the influence of the write clock read from the tape, therefore the loss of at least one 15 clock pulse leads to a failure of the control device 2,

To restore the operation of the device, two conditions are necessary.

20 The first is the installation in O of all elements of the control device, the VTO leads to the fact that the remaining part of the information in the storage device is erased, and the part on the 25 tape is not checked to be equal to it. If sync. the impulse is lost at the beginning of the recording zone, then the entire zone remains unplayed. B. The second condition is the termination of the magnetic recording, which is perfect

30 is not acceptable to registrars.

telemetry information, paeoTaio th in continuous mode. The gap detector, made in the form of a counter of the 11 bits of the 2000 decoder code, cannot detect the loss of single sync pulses and groups of less than 2–000 pulses. In addition, this device has no means of determining the location of errors on a magnetic tape and is inoperable without control signals from the processor.

The purpose of the invention is to increase the reliability of the device during continuous recording.

The goal is achieved by the fact that in a device for controlling a magnetic recording containing an information recording head, connected to a storage and output unit, an information playback head associated with the first input of the comparison unit, whose input is connected to the first input of the error trigger of the recording head and reproducing sync pulses, connected by two inputs of the control unit of the sync pulses, as well as individual trigger and an OR element, the second input of the comparison unit is connected to the output of the storage and output unit, The sync pulse playback head is connected to the second error trigger input, the output of which is connected through the serially connected OR element and the trigger to the control unit input, clock pulses and the control input of the storage and information output unit is connected to the sync pulse recording head.

The sync pulse control unit is made of a series-connected OR element, a T-flip-flop and an AND element, as well as an Rs-flip-flop, while the inputs of the latter and the OR element are connected to the recording and playback heads, respectively, and the second input of the I-element is connected to the T-flip-flop output .

In addition, a time signal generator in a binary-decimal code, a time signal recording head, an error coordinate determinant, And elements and delays are entered into the device, while the output of the signal generator in a binary-ten code is connected to the signal recording head and the information input error coordinates, clock input which is associated with the sync pulse recording head, the output of the OR element and the determinant of the error coordinate are connected via AND connected and delays to the setup inputs trigger and error trigger.

On fi.g. 1 is an enlarged block diagram of a control device; on

FIG. 2 - the block KONTROO.PYA SINH) SIMPULS.

The control device contains a block 1 of storing and issuing information, element 2 Exclusive OR, trigger 3 errors, block 4 controlling clock pulses, trigger 5, determining 6 coordinates of the error, element OR 7, element AND 8 and respectively connected terminals: 9 - to the recording head information, 10 - to the head of reproduction of information, 11 - to the head of recording clock pulses, 12 - to the head of playback of clock pulses, 13 - to the head of recording the time code. The device also contains a time code generator 14.

FIG. 2 shows a sync pulse control unit, which shows an R-S trigger 15, a T-trigger 16, an OR element 17, and an And 18 element connected in an appropriate way.

The device works as follows.

Claims (2)

The information input of the storage and output unit 1 via terminal 9 receives information from the recording head, and the control input through terminal 11 of the recording clock under the control of these pulses information is sequentially recorded in block 1. After some time, the recording on the magnetic tape reaches the head reproduction, through terminal 10 the information goes to the first input element 2, and the second input of element 2 simultaneously receives a copy of this information from block 1, and in case of a discrepancy from the output of element 2 enters The signal to the 3-input of the trigger 3, which sets it to the error state. In order for the trigger 3 to be triggered only at the moment of comparing the information in eletient 2, the trigger 3 is synchronized via terminal 12 by the write clock read from the tape that arrives at C- trigger input 3. At the same time, the recording of clock pulses is checked in block 4, the first input of which through terminal 11 receives the clock pulses from the recording head, and to the second input - clock pulses from the playback head through terminal 12. In the case of ejection of clock pulses tape recordings at the output of the block. 4, a signal that arrives at the S input of trigger 5 appears. which is set to an error state. The input of the determinant b from the generator 14 receives a sequential time code and, under the control of the clock pulses from the terminal 11, is converted in the determinant 6 into a parallel code. At that moment, when the conversion is completed, the unlocking potential flows from the Detector b to the And 8 element, and if at least one of the triggers 3 or 5 is in the error state, then the signal from the output through the logical element OR passes through the open element AND control input fixing device. Thus, when a magnetic recording error is recorded, the magnetic track track number, where the error occurred, and the time are recorded. Then, the signal from the AND 8 element goes through the element 1 to the R-inputs of the triggers 3 and sets them in O. The clock control unit works as follows. At the S-input of the trigger 15 through the terminal 11 receives the write clock. This impulse sets the trigger 15 to the state, simultaneously through the OR element 17 it arrives at the T input of the trigger 1 b and sets it to the state. The R input of the trigger 15 arrives through the terminal 12 of the sync pulse from the playback head. This pulse sets the trigger 15 to the state 0, and the trigger 16 to the state. In case the clock pulse does not come from the playback head, the second clock pulse, recording, arriving at the S input of the trigger 15, confirms its state, and the trigger 16 sets it to the state. Thus, an error signal appears at the output of AND gate 18. The use of a random access memory as a storage unit and information output controlled only by write clock pulses, and a more sensitive control circuit for magnetic clock clock recording, allows the device to be used to monitor digital magnetic recorders operating in continuous mode, and the introduction of error coordinates into the device allows you to fix the location of the bad sections on the magnetic carrier and, thereby, exclude during processing the telemetric errors caused by e low-quality magnetic recording. Claims 1. A device for controlling a magnetic recording, comprising an information recording head connected to a storage and output unit. the information playback head associated with the first input of the comparator unit, the input of which is associated with the error trigger input, the recording and reproducing head of sync pulses connected to the two inputs of the sync pulse control unit, as well as an individual trigger and OR element, characterized in that improving the reliability of the device during continuous recording, the second input of the comparator unit is connected to the output of the storage unit and information, the clock recording head is connected to the second input of the error trigger, the output is Secondly, through the successively connected elements, OR, and the trigger is connected to the input of the control unit of the sync pulses, and the control input of the storage and output unit is connected to the recording head of synchro pulses. 2. Device pop. 1, characterized in that the control unit for sync pulses is made of series-connected electric ampli and the second input element And is associated with the output of the RS flip-flop. 3. The device according to claim 1, characterized in that, in order to determine the location of errors | on magnetic media, a time signal generator in a binary-decimal code, a time signal recording head, an error coordinate determinant, And elements and delays, the output of the time signal generator in a binary-decimal code is connected to the time signal recording head and the information input of the error coordinate determinant, the clock input of which is associated with the clock recording head, and the OR element outputs and coordinate error bodies connected through series-connected AND gates and the inputs to the locating zascherzhki trigger and trigger mistaken. Sources of information, rintied into account during the examination 1. UK patent No. 1263471, p. G 5 K, published. 1972. 2. Patent of Great Britain No. 1408818 l. G 4 C, publish. 1975 (prototype).