SU1190403A1 - Device for magnetic recording-reproducing of digital information - Google Patents

Abstract

DEVICE DL51 MAGNETIC RECORDING - Playback of digital information comprising a frequency divider, whose output is connected to an adjustable DC voltage to AC, connected outputs to the motor of the deck, equipped with first magnetic head is connected to an input bus information signal and to the input of amplifier information signal and a second magnetic head connected to the input bus of the clock signal and to the input of the clock signal amplifier connected to the output to the direct input Moving the reverse shift register, which is connected to the input bus of the write mode command and to the output of the pulse generator connected to the input of the frequency divider, the first and second And elements connected by the first inputs to the outputs of the first and last bits of the reverse shift register, and the output bus, by the fact that, in order to reduce temporal distortions of the reproduced digital information, a reversible counter is inserted into it, connected by inputs to the input bus of the mode i recording command and to the outputs of the first first and second elements And, an adder connected by outputs to other inputs of a frequency divider, and an additional frequency divider, which is connected by an output to the second inputs of the first and second elements AND. And connected by an input to an output of a pulse generator, and the inputs of the adder are connected to the outputs of a reversible counter and to the outputs of the reversing bits of the .4 shift register, D the output of the information signal amplifier is connected to the output bus O 00.

Description

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The invention relates to the field of magnetic recording, in particular to devices for magnetic recording - reproduction of digital information.

The purpose of the invention is to reduce the temporal distortion of the reproduced digital information.

The drawing shows one of the possible variants of the proposed magnetic recording device — reproduction of digital information.

The device contains a frequency divider 1, the output of which is connected to a constant voltage-to-alternating voltage converter 2, connected to the outputs with an electric motor 3 of a tape-drive mechanism 4, equipped with the first 5 and second 6 magnetic heads, and the first and second elements And 7 and 8, connected first inputs to the outputs of the first and last bits of the reverse register 9 shift. The first magnetic head 5 is connected to the input bus 10 of the information signal and to the input of the amplifier 11 of the information signal, the output of which is connected to the output bus 12. The second magnetic head 6 is connected to the input bus 13 of the clock signal and to the input of the amplifier 14 of the clock signal connected by the output to the input direct advancement of the reverse shift register 9, which is connected to the input bus 15 of the write mode command and to the output of the G6 generator, pulses connected to the input of the frequency divider 1.

The device also contains a reversible counter 17 connected by inputs to the input bus 15 of the write mode command and to the outputs of the first and second elements I 7 and 8, an adder 18 and an additional frequency divider 19. The adder 18 is connected to the outputs of the other inputs of the divider 1 frequency. An additional frequency divider 19 is connected by an output to the second inputs of the first and second elements I 7 and 8 and is connected by an input to the output of the pulse generator 16. In this case, the inputs of the adder 18 are connected to the outputs of the reversible counter 17 and to the outputs of the bits of the reversing register 9 of the shift.

Magnetic recording - reproduction of digital information pos04032

The device proposed is as follows.

In the write mode of the input bus 15, the write mode command enters a signal that sets the reversing shift register 9 and the reversing counter 17 to the state corresponding to their half full. The signals of the reversing register of the shift 9 and the reversible counter 17 in the form of a parallel code are fed to an adder 18, which generates a recording speed signal supplied to frequency divider 1,

5 having a variable division factor. A frequency divider 1 generates a constant frequency signal supplied to a constant voltage converter 2,

Q acting on the electric motor 3 of the tape drive mechanism 4, which moves the magnetic tape at a speed proportional to the frequency of the signal of the generator of 16 pulses. With

5, the information signal and the clock frequency signal received on the information signal input bus 10 and the clock signal input bus 13 are recorded by the first 5 and second 6 magnetic heads on a magnetic tape.

In the playback mode, the information signal reproduced from the magnetic tape comes from the first magnetic head 5 through the information signal amplifier 11 to the output bus 12. The clock signal reproduced from the magnetic tape of the second magnetic head

6, passes through a clock signal amplifier 14 to a reverse shift register 9, to which also a signal from the pulse generator 16 is applied. The reverse shift register 9 produces a phase comparison of the clock frequency signal reproduced from the magnetic tape and the signal from the generator 16 pulses. The magnitude of the phase mismatch in the form of a parallel code is applied to the adder 18, which also receives the signal of the reversible counter 17. In this case, the signal of the reverser, the counting counter 17 is first determined

and the second elements And 7 and 8, which are affected by the reverse shift register 9 and the generator 16 pulses. 31 If the phase mismatch of the clock signal frequency reproduced from the magnetic tape and the signal of the pulse generator 16 begins to exceed the volume of the reverse shift register 9, the signal from the adder 18 to the frequency divider 1 changes. 3 The latter changes its effect through a dc-to-ac converter 2 to a motor 3 of a tape drive mechanism 4, which provides a change in the speed of movement of the magnetic tape in the direction of its nominal value.

Claims (1)

DEVICE FOR MAGNETIC RECORDING - PLAYBACK OF DIGITAL INFORMATION, containing a frequency divider, the output of which is connected to a DC-to-AC converter connected to the outputs with a tape drive electric motor, equipped with a first magnetic head connected to the input signal signal bus and to the input of the information signal amplifier, and the second a magnetic head connected to the input bus of the clock signal and to the input of the amplifier of the clock signal connected by the output to the input of direct movement the reverse shift register, which is connected to the input bus of the recording mode command and to the output of the pulse generator connected to the input of the frequency divider, the first and second elements And connected by the first inputs to the outputs of the first and last bits of the reverse shift register, and the output bus, characterized in that, in order to reduce temporary distortions of the reproduced digital information, a reverse counter is introduced into it, connected by inputs to the input bus of the recording mode command and to the outputs of the first and second ele And, the adder connected by the outputs to other inputs of the frequency divider, and an additional frequency divider, which is connected by the output to the second inputs of the first and second elements And and connected by the input to the output of the pulse generator, and the inputs of the adder are connected to the outputs of the reversible counter and to the outputs of the bits of the reversible register shift, D the output of the information signal amplifier is connected to the output bus. S „„ 1190403> 1 11