SU1485306A1 - Device for measuring parameters of motion of magnetic carrier - Google Patents

Description

The invention relates to a measurement technique, namely, devices for the emission of motor parameters. magnetic carrier. The purpose of the invention is to improve the accuracy of measurement of motion parameters. The device contains a multi-channel magnetic head 1 recording-playback

with two vertical 22 and 23, one oblique 19 and two working gaps 20 and 21 arranged one after the other and windings 24-27 connected to five amplifiers-formers

2, time interval meters

3, 4, 14, and is equipped with three buffer registers 5, 8 and 15, the outputs of which are connected to the registration unit 9, to which the outputs of the multiplication unit 7 and the division unit 16 are also connected, the output of which is also connected to the second inputs of multiplication units 6 and 7 . The oscillation is measured by the frequency determined by the technical parameters of the magnetic recording apparatus and the speed of the time interval meters, which read the measurement results from the buffer registers 5 and 8 and, using the interface circuitry, read the measurement results from the buffer registers 5 and 8. This contributes to the accuracy and expansion of the measurement frequency range of £ 2,030, 1 or '.

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The invention relates to a measuring technique, namely, devices for measuring the motion parameters of magnetic media.

The aim of the invention is to improve the measurement accuracy of the parameters of the movement of the magnetic tape due to the joint account of changes in skew and transverse vibrations.

The drawing shows a functional diagram of the device for measuring the parameters of movement of magnetic media.

The device for measuring the motion parameters of the magnetic carrier contains a block of 1 magnetic heads connected by outputs to the inputs of the block of driver amplifiers 2, the first 3 and second 4 time interval meters connected by the first inputs to the first and second outputs of the block of driver amplifiers 2 connected to the first output the second input of the second meter 4 time intervals and the third output with the second input of the first meter 3 time intervals connected by the output through the first register 5 to the first input of the first go block 6 multiplication. The first multiplication unit 6 is connected by a second input to the first input of a second multiplication unit 7 connected by a second input through a second register 8 to an output of a second meter 4 time intervals and an output to one of the output buses 9 and the first input of the third multiplication unit 10. The third multiplication unit 10 is connected by a second input to the first control bus 11. The device also comprises second 12 and third 13 control buses.

The device for measuring the motion parameters of the magnetic carrier also contains the third time meter 14 connected in series, the third register 15 and the first dividing unit 16 connected by an output to the first input of the second multiplication unit 7 and one of the output bus 9 and the inputs to the second control bus 12 and interconnected to the control input of the third register 15, the first input of the third meter 14 time intervals and the fourth output of the amplifier unit shapers 2. The amplifier unit shapers 2 are connected yatym input to a second input of the third measuring instrument 14 timeslots. The device also comprises a second division block 17 and a subtraction block 18, the second division block 17 being connected by inputs to a third control bus 13 and the output of the first multiplication unit 6 and an output to the first input of subtraction unit 18, g connected by a second input to the output of the third multiplication unit 10 and access to one of the output tires 9.

One channel of the magnetic block 1 is made with a bevelled working gap 19, the second one - with two working clearances 20 and 21, and the third and fourth channels - with vertical working clearances 22 and 23 located along the edges of the heads of the magnetic head unit 1. The windings 24-28 of the magnetic head unit 1 are its respective outputs.

The device works as follows.

• On a magnetic tape moving in a tape drive mechanism ('not shown), signals are recorded using a block of 1 magnetic heads with working gaps 19, 10, 22 and 23. The recording period in the channel with two working clearances 20 and 21 is chosen by the large time of passage of the magnetic mark of the distance between the working clearances,

In the playback mode, the signals reproduced from the magnetic tape from the windings 24-28 of the block 1 of magnetic heads through the block of amplifiers-formers 2 are fed to the meters 3,

4 and 14 time intervals. Using the time meter 14, the transit time of the magnetic mark is measured between the working gaps 20 and 21, the value of which is recorded in the register 15 by the second pulse from the winding 27 of the working gap 21, and fed to the input of the division unit 16, to another input from the control bus 12, a signal is input proportional to the corresponding distance between the working gaps 20 and 21 of the magnetic head 2. In block 16, the instantaneous speed of the magnetic tape movement is determined.

The temporal mismatch between the pulses from the extreme channels of the block 1 of the magnetic heads from the working gaps 22 and 23 is determined with the aid of the meter 4 of the time interval. The value of the time interval registrami1485306

It is registered in register 8 and transmitted to multiplication unit 7, in which the magnetic carrier skew is determined.

The skew value is fed to the input _{5 of the} multiplication unit 10.

The temporal mismatch due to the transverse oscillations of the magnetic tape is determined using a meter 3 time interval. The value of the time error from the meter 3 of the time interval goes to register 5. The time error at the output of the meter 3 of the time interval corresponds to the transverse * 15 oscillations of the magnetic carrier.

In block 6 multiplication is the multiplication of the time error by the magnitude of the speed of movement of the magnetic tape. After that, the result of multiplication is transmitted to one input of division block 17, to the other input of which a coefficient is inserted corresponding to the angle between the gaps 19 and 23 from the control bus 25.

Thus, the output of the block 17 division will be the value of the transverse movement of the tape.

The distortion of the magnetic tape causes not only mismatch between the working gaps 22 and 23, but also between the working gaps 23 and 19.

The value of the transverse oscillations from the output of block 17 division goes to block 18 subtraction, to another input of which is fed a coefficient proportional to the amount of skew multiplied in block 10 multiplication by a signal proportional to the private separation of the distance between the gaps 19 and 23 and the distance between the gaps 22 and 23 entered from the control bus 11.

Thus, at the output of block 45 18 subtraction 26 is obtained the value of the transverse oscillations of the tape. Since the directly measured instantaneous speed of the magnetic tape is used to determine the skew and transverse vibrations, the accuracy of determining these parameters is increased by 10-15%. In addition, measurement of the skew and lateral oscillation is produced at a frequency determined tech- ₅₅ "nical parameters, apparatus and magnetic recording speed of the PA: dioelektronnyh blocks that produce meter reading with registers 5, 8 and 15, 23 and the registration processing and results measurement. In addition, it provides simultaneous measurement of the instantaneous skew speed and transverse oscillations of the tape.

Claims (1)

Device for measuring the parameters of the movement of magnetic media containing a block of magnetic heads connected by outputs to the inputs of the block of amplifier amplifiers, the first and second time interval gauges - 'connected by the first inputs to the first and second outputs of the block of amplifier amplifiers connected by the first output to the second input of the second time interval meter and the third output with the second input of the first time interval meter connected via the first register to the first O input the first multiplication unit connected by a second input to the first input of the second multiplication unit connected by a second input through a second register with the output of the second time interval meter and output from one of the output buses and the first input of the third multiplication unit connected by the second input to the first control bus, and also contains the second and third control bus, which is characterized by the fact that, in order to improve the measurement accuracy of the parameters of the magnetic tape movement, by jointly taking into account the changes in skew and transverse oscillations, the third meter of time intervals connected in series, the third register and the first division block are connected to the first input of the second multiplication unit and one of the output buses and the inputs to the second control bus and the third input connected to each other the third time interval meter and the fourth output of the amplifier unit - drivers, connected by the fifth input to the second input of the third time interval meter, and the second block to division and subtraction unit, with the second division unit connected by inputs to the third control bus and the output of the first multiplication unit and output to 7 1485306 eight the first input of the subtraction unit, the sub-third multiplication unit and the outputs to connected by a second input to the output of one of the output tires.