SU1582199A2 - Device for stabilization of speed of motion of magnetic record carrier - Google Patents

Abstract

The invention relates to instrumentation, namely, devices for controlling the speed and phase of the magnetic recording medium. The aim of the invention is to improve the quality of recording and reproducing information. For this purpose, a memory device 13, a multiplexer 12, the first 11 and the second 9 counters are entered into the device for stabilizing the speed of movement of the magnetic recording medium. The entered blocks form a burst of pulses with variable frequency. The first counter 11 outputs a parallel code specifying the address of the corresponding cell in the memory 13, at the output of which a parallel code appears. At the same time, this code appears at the data inputs of the multiplexer 12. The parallel code of the second counter 9 controls the multiplexer 12. As a result, the multiplexer 12 converts the parallel code at its data input into a serial code at the output. By writing certain codes to the memory 13, it is possible to programmatically change the instantaneous value of the clock frequency. 4 il.

Description

1 (61) 1265844

(21) 4299856 / 24-10

(22) 08/20/87

(46) 07/30/90. Bul Number 28

(71) North Caucasus Institute of Mining and Metallurgy

(72) S.M.Sirenko, I.F.Yarovoj and Yu.I.Yablochkina

(53) 621.317.7 (088.8)

(56) USSR Copyright Certificate No. 1265844, cl. G 11 B 15/46, 1986.

(54) DEVICE FOR STABILIZATION OF MOTION SPEED OF MEDIA MAGNET RECORDING

(57) The invention relates to instrument making, namely to devices for controlling the speed and phase of a magnetic recording medium. The aim of the invention is to improve the quality of recording and reproducing information. For this purpose, a memory device 13, a multiplexer 12, the first 11 and the second 9 counters are entered into the device for stabilizing the speed of movement of the magnetic recording medium. The entered blocks form a burst of pulses with variable frequency. The first counter II generates a parallel code specifying the address of the corresponding cell in the memory 13, at the output of which a parallel code appears. At the same time, this code appears at the data inputs of multiplexer 12. The parallel code of the second counter 9 controls the multiplexer 12. As a result, multiplexer 12 converts the parallel code at its data input into a serial code at the output. By writing certain codes to the memory 13, it is possible to programmatically change the instantaneous value of the clock frequency. 4 il.

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The invention relates to instrumentation and is an additional ed.St. No. 1265844.

The purpose of the invention is to improve the quality of recording and reproduction by increasing the accuracy of controlling the speed of movement of the carrier.

FIG. presents a block diagram of an apparatus for stabilizing the speed of movement of the information carrier; in fig. 2 - timing diagrams for the operation of the device; FIG. 3 is an example of a level quantizer characteristic; in fig. 4 shows an example of the implementation of newly introduced elements.

The device for stabilizing the speed of movement of the magnetic recording medium (Fig. 1) contains a series-connected Phase discriminator, element 2, frequency-frequency equalizer 3, power amplifier 4, electric motor 5, and speed sensor 6. In addition, the device contains a master oscillator 7, the output of which connected to the input of the frequency divider 8, the output of which is connected to the second inputs of the phase discriminator 1 and the second counter 9, and also to the input of the synchronization unit 10, the output of which is connected to the second input of the frequency and frequency corrections ora 3 and with the first inputs of the first counter 11, the second counter 9, and multiplexer 12 "The second input of the first counter 11 is connected to the third input and the second output of the second counter 9, and the output to the input of the storage device 13, the output of which is connected to the second the input of the multiplexer 12, the third input of the multiplexer 12 is connected with the first output of the second counter 9, and the output of the multiplexer 12 - with the second input of the element I 2, the electric motor is kinematically connected with a disk of video heads 14 providing read / write video signal from a magnetic tape on the motion of which is determined by the feed 15 and the receive 16 nodes.

The device works as follows.

The signal U. (Fig. 2) from the speed sensor 6 and the signal U, the reference frequency from frequency divider 8, go to phase discriminator 1. At the output of phase discriminator 1, a sequence of pulses U ,, is produced, the duration of which is equal to

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phase of signals from speed sensor 6 and frequency divider 8. The received pulses go to one input of the element 2, the second input of which receives the signal Uj- from the output of multiplexer 12. At the output of the element 2, pulses U are generated. The frequency-phase corrector 3 counts the number of pulses, forms the corresponding code and converts this code by PID Eaconu in the control signal, which came through the amplifier 4 power to the electric motor 5, providing control of the Phase position of the shaft of the electric motor 5. The location of the pulses in the signal Uj- produced by the multiplexer m 12, sets the characteristic of the quantizer (Lig.Z). This signal is generated as follows.

The synchronization unit 10 generates a signal U4, which determines the maximum value of the measured error. The multiplexer 12 is blocked by the high level of this clock signal, and the first 11 and second 9 counters are set to the zero state. The low level of the sync signal removes the blocking from the multiplexer 12 and allows the high frequency pulse to be counted by the second counter 9. The high frequency signal is generated by the master oscillator 7 and fed to the first counter 9 via the frequency divider 8. Production of the pulse count, the first counter 9 sequentially changes its state. The codes corresponding to these states are removed from the first output of the first counter 9 and fed to the third input of the multiplexer 12. The second input of the multiplexer 12 is supplied with a code that is recorded in the i-th cell of the storage device 13. The cell number is specified by the code from the output of the first counter 11. A sequential code at the third input of the multiplexer 12 converts the parallel code at the second input of the multiplexer 12 into a serial code at its output. Having calculated from O to n, i.e. issuing to the output of multiplexer 12 the contents of all bits of the code of the i-th memory cell, the second counter 9 is set to zero and produces a signal at its second output. With this signal, the code of the first counter 11 is increased by 1. Thus

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the output of memory 13 is the code written in the (1 + 1) -th cell. By setting the codes in the corresponding cells of the storage device, one can arbitrarily change the type of signal and, accordingly, the quantizer characteristic.

Claims (1)

Invention Formula 58 The device for stabilizing the speed of movement of a magnetic recording medium according to the auth.St. No. 1265844, characterized in that., In order to improve the accuracy of stabilizing the speed, a memory device is inserted in it Jq 8 1996 first multiplexer, the first and second counters, the first input of the first counter connected to the output of the synchronization unit, the first input of the second counter, the first input of the multiplexer, the output of which is connected to the second input of the first element And, the second input of the multiplexer, and the third input - with the first output of the second counter, the second input of which is connected with the output of the second frequency divider, and the third with the second output of the second counter and with the second input of the first counter, the output of which is connected with the input commemorating device. 15 FIG. 2 g Fig.d 1st counter Tschsvs 2- & counter PTs mpipnhi .. 7 MS 6 9t ten 18 2B 21 6 AH "I S CSJ AND IS IS 17 15 L is FIG L