SU1282211A1 - Device for checking magnetic tape recorder - Google Patents

Abstract

The invention relates to magnetic recording and permits a reduction in control errors. So that during the time determined by the duration of the pulse generated by the multivibrator .1 9, the error pulses from the output of the prohibition element 5 do not arrive at counter 6, the serial register 23 is entered into the device, the number of bits of it is such that the time of passage of the error pulses through it is longer or equal to the duration of the pulse generated by the multivibrator 19. At the time of closing the BAN element 5, the error pulses caused by the end of the control test did not arrive at counter 6, and after closing the element BAN 5 the signal with the output of the trigger 15 is applied to the zero-reset input of the register 23 and the device is prepared for the next reproduction of the control test. 1 il. S С /)

Description

one

This invention relates to a magnetic recording technique, namely, devices for monitoring a magnetic recording apparatus.

The purpose of the invention is to reduce the control error.

The drawing shows a block diagram of the proposed device.

The device contains a counter 1, a unit 2 for reproducing the apparatus 3 of a magnetic recording, a block 4 for recording the same apparatus, an element BANE 5, a counter 6, an indicator 7, a serial register 8, a generator of 9 pulses, an element NOT 10, a sequential register 11, the elements EXCLUSIVE OR 12-14, trigger 15, decoders 16 and 17, pending multivibrators 18-20, element 21, counter 22, sequential register 23 and element 24.

The device works as follows.

The generator 9 generates clock pulses, which through the sequential register 8, the EXCLUSIVE OR 12 element and the NOT 10 element are fed to the input of the recording unit 4 of the monitored apparatus 3 of the magnetic recording. The listed elements, with the exception of block 4 of the record of the controlled apparatus 3, form a sensor of a recurrent sequence of impulses. The playback unit 2 generates clock and information signals from the recorded sequence, which are fed to the node for checking the reproduced signals for recourse. The test node is made on register 11, elements EXCLUSIVE OR 13 and 14, and element NOT 21. The presence of errors in individual reproducible signals leads to the appearance of the element SHOISCHEME OR 14. The error pulses from the output of the element EXCLUSIVE CE or 14 arrive at the element ZALRET 5 and further through the serially connected register 23 and the AND 24 element to the 6 error counter, the state of which is displayed by the indicator 7. The BANCH 5 element is opened by the trigger 15 for the playback time of the control test. Upon receipt of the control test trigger 15 together with the counter 1, the decoder 16 and the waiting multivibrator 18.no the signals of the playback unit 2 and the ECK element, IJAJO SEC

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OR 14 unlocks the element BANCH 5. Before the control test arrives and at the end, trigger 15 together with the waiting multivibrator 19, counter 5, decoder 17 and the waiting multivibrator 20 according to the signals of the EXCLUSIVE OR element 14 locks the element BAN 5.

At the end of the control-test, at the output of the EXCLUSIVE OR 14 element, a sequence of error pulses appears. After a time determined by the duration of the pulse generated by the waiting multivibrator 19, the BANE 5 element is closed. In order for the error pulses from the output of the BANCH 5 element not to pass to counter 6 during this time, the register 23 is entered into the device, and the number of bits is that the time of the passage of the error pulses through it is longer, or equal to the duration of the pulse generated by the waiting multivibrator 19. Thus, by the time the element BANGE 5 is closed, the error pulses caused by the end of the control th test do not pass at the counter 6, and after zakrshani element 5 inverted signal from the output of flip-flop 15 is applied to the reset input serial register 23 and the apparatus is prepared for the next test case reproduction.

For reliable operation of the counter 6, the output signal of the sequential array 23 is gated with the I1 timing pulses from the AND 24 element. Before starting operation, the counter 6 is reset to the initial state by applying a control signal via the zero bus.

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Claims (1)

Invention Formula A device for controlling a magnetic recording apparatus, comprising a pulse generator, a first counter connected by a first input to a first output of a reproducing unit of a monitored magnetic recording apparatus, a BAN element, a second and a third counter, a power supply and a second element NOT the first serial register connected by the first input to the output of the pulse generator, and the second input to the output of the first element NOT connected to the input of the recording unit 312 the controlled device, the second sequence register connected by the first and second inputs to the first and second outputs of the playback unit, the first element EXCLUSIVE OR, connected by the output to the input of the first element NOT, the second element EXCLUSIVE OR, connected by the output to the input of the second element NOT, the third element EXCLUSIVE OR, connected by the first input to the output of the second element NOT and connected by the output to the first input of the BAN element, to the first input of the third counter and to the second input of the first counter, the first and second th decoders and the first, second and third standby multivibrators, with the outputs of the first serial register connected to the inputs of the first element EXCLUSIVE OR, the outputs of the second serial register connected to the inputs of the second element EXCLUSIVE OR, the second input of the third element EXCLUSIVE IL, connected to the second input of the playback unit, - the third decoder is connected between the output of the first counter and the input of the first O 2 five five 0 five 1 14 standby multivibrator connected to the output of the first trigger input, and the second multivibrator standby is connected between the output of the third element EXCLUSIVE OR and the second input of the third counter, the output of which is connected via the second decoder to the input of the third standby multivibrator connected to the output of the second input of the end jacks of the outlets. The second input of the BAN element, characterized in that, in order to reduce the control error, it is provided with a third consecutive register and the AND element, the first input of which It is connected to the output of the third serial register, the second input is connected to the Q clock input of the third serial register and to the first output of the playback unit, and the output is connected to the input of the second counter, while the input of the third serial register is connected to the output of the BAN element and the zero input of the third serial register connected to the trigger output.