SU1269203A1 - Device for measuring skewness of magnetic tape - Google Patents

Abstract

The invention relates to the accumulation of information and allows to simplify the device and improve the accuracy of the skew measurement. The device contains a magnetic tape 1, blocks 2 magnetic heads, amplifiers 3 and 4, differentiating elements 5 and 6, elements OR 7, 23, elements AND 8, 10, II, 12, 13 and 14, triggers 9 and 18, counters 15, 16 and 17, a decoder 19, a key register 20, a pulse generator 21 and a comparison unit 22. The introduction of new elements and the formation of new connections between the elements of the device allow fluctuations in the magnitude of the skew near the zero value to take into account with averaging all the measurements, including zero. 1 il.

Description

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The invention relates to the accumulation of information, namely, devices for measuring tape skew.

The aim of the invention is to simplify the device and determine the accuracy of measuring the skew of the magnetic tape.

The figure shows the proposed device for measuring tape skew.

The device contains the reproduction of these magnetic heads located on opposite sides of magnetic tape 1, the input of unit 2 magnetic heads and connected through the first and second amplifiers -tow 5) worlds 3 and 4 with the inputs of the nerve and the second diffusion1) of the 5 and 5 elements 6, connected by outputs to the inputs of the first element OR 7, to the inputs of the nerve element AND 8 and to the inputs of the nerve trigger 9, the second - the 1st element AND 10--14, the first 15 and the second 16 counters, is reversible counters, the third counter 17, second tr igger 18, decipheror 19, keypad 20, pulse generator 21, comparison unit 22 and second element OR 23.

The direct and inverse outputs of the nerve trigger 9 are connected to the first inputs of the second and third elements 10 and 11, respectively, connected to the outputs, respectively, to the summing and subtracting inputs of the nerve counter 15, the outputs of which are connected to the output 24. The second trigger 18 is connected by a counting input to the nerve output element OR 7 and connected inverse output to the first input of the fourth element OR 12, the output of which is connected to the first input of the fifth element AND 13. The output of the fifth element And 13 is connected to the second inputs of the second and third its elements and I) and 11 and to the subtracting input of the second counter 16. The outputs of the second counter 16 are connected via depilator 19 to the second input of the fourth element I 12 and connected to the inputs of the comparator unit 22 connected by other inputs to the outputs of the keyboard 20. comparison is connected to the control input of the second counter 16 and the reset input of the second trigger 18. The forward output of the second trigger 18 is connected to the first input of the HiecToro element 14, connected to the output of the summing input of the second counter 16 and connected to the second one at Move to the output of the generator 21 pulses. The output of the pulse generator 21 is also connected to the second input of the second element AND 13. The second element OR 23 is connected by the first input to the output of the first element AND 8 and the second input to the output of the fourth element AND 12. The output of the second element OR 23 is connected to the input of the third counter 17 connected by an output to the control input of the first counter 15.

Measuring the skew of the magnetic tape by means of the proposed device is as follows.

The signals reproduced from the movable magnetic tape 1 by the reproducing magnetic heads, after limiting the amplitude to the first and second amplifiers-formers 3 and 4, arrive at the first and second differentiating elements 5 and 6. The result of differentiation from the nerve and the second differentiating elements 5 and 6 It arrives at the first trigger 9, the definite sign of the non-drekos of magnetic tape 1, and passes through the first element OR 7 to the second trigger 18. From the direct output of the second trigger 18 pulse,

characterizing the magnitude of the skew of the magnetic mite 1, goes to the 1st and 11th element, which transmits the pulses of the generator 21 of them 1 pulses to the summing input of the second counter 16, acting on the generator 19, forming the enabling signal supplied to the quarter element And 12. After the end of the pulse on At the output of the second trigger 18, a pulse from its inverse output opens the fourth element AND 12, acting directly on the new element AND 12, and through the second element OR, 23 - on the third counter 17. Through the fifth element And 13 pulse The generator of the pulse generator 21 is 1 pass to the subtracting input of the second counter 16 and to the second and third elements AND 10 AND 11. Depending on the state of the first tripper 9, determined by the sign of the tape skew of magnetic tape 1, the pulses of the fifth element And 13 go to the first the counter 15 through the second element AND 10 or through the third element AND 11. The number of 1 pulses that read them is equal to the number of filling pulses, since when the second counter 16 is in a zero state, the decoder 19 removes the enabling signal from the fourth element 12, and each read is counted

the third counter 17. After filling the third counter 17 on its output, a control signal appears that goes to the first counter 15. At the same time, the first counter 15 forms the code of the averaged measurement result of the nerecosa of the tape tape 1. When fluctuations of the skewness near the zero value, measurements have different meanings. At zero values of the skew of the magnetic tape 1, the matching pulses through the first element And 8 and the second element

OR 23 passes to the third counter 17.

Claims (1)

Invention Formula A device for measuring the skew of a magnetic tape, containing reproducing magnetic heads connected via the first and second amplifiers to the inputs of the first and second differentiating elements, respectively, connected by outputs to the inputs of the first OR element, to the inputs of the first element AND to the inputs of the first trigger, etc. my and inverse outputs of which are connected to the first inputs of the second and third elements, respectively, And connected to the outputs, respectively, of the summing and subtracting inputs of the first account Ik connected by the outputs to the output of the second trigger connected by a counting input to the output of the first element OR connected inverse output to the first input of the fourth element And connected by the output to the first input of the fifth element And whose output is connected to the second inputs of the second and third elements And to the subtracting input of the second counter, the outputs of which are connected through a descrambler to the second input of the fourth element And, and are connected to the inputs of the comparison unit connected by other inputs to the outputs of the keypad register and connected to the control input of the second counter and to the reset input of the second trigger, the direct output of which is connected to the first input of the input element AND connected to the summing input of the second counter and connected to the second input of the pulse generator connected to the second input The second element AND, the second element OR, connected by the nerve input to the output of the first element AND, and the third counter, characterized in that, in order to simplify it and show the accuracy of the measurement, the nerecosa is magnetically tape, a second OR gate second input connected to the output of the fourth AND gate and the output connected to the input t) ete1o counter output connected to the control input of the first counter.