SU1509991A1 - Device for digital magnetic recording/playback - Google Patents

Abstract

This invention relates to digital magnetic recording and can be used in external storage devices of microcomputers and personal computers. The aim of the invention is to improve noise immunity without reducing the density of a digital magnetic recording and the amount of information recorded on magnetic media. The device contains a seven-bit Hamming encoder, a parallel-parallel register, a binary-seven-converter, a 32-bit parallel-serial register, a delay unit, a synchronization unit, a preliminary correction unit, a recording amplifier, a recording head, and a playback head in the playback channel. , 5 clock frequency selector, frequency divider, controlled oscillator, delay unit, two NOT elements, two one-shot, two counters, OR element, shift register, parallel-parallel to n a converter 28, a decoder 26, a seven-decoder. A close-packed set of seven-dimensional signals of volume-spherical stacking is used as recording state signals, and during playback, a soft solution is detected. The reduction in noise immunity caused by the transition to the seven-fold signals is compensated by the use of the seven-fold Hamming coder, which corrects single errors of any order. 2 Il.

Description

;about her

The invention relates to magnetic recording, in particular to devices for digital magnetic recording-reproduction.

The purpose of the invention is to improve noise immunity without reducing the density of a digital magnetic recording.

Figures 1 and 2 depict respectively the recording and reproducing parts of one of the possible variants.

proposed digital magnetic recording-reproducing apparatus.

The device contains a recording 1 magnetic head and a reproducing 2 magnetic heads installed with the possibility of interaction with a magnetic recording medium (not shown) and connected respectively to the output of the recording amplifier 3 and to the input of the imager 4 reproduced

the signal connected to the output of the selector is 5 clock pulses, delay block 6, first and second registers 7 and 8, code converter 9, clock pulse shaper 10, amplitude-frequency equalizer 11, first and second single-vibrators 12 and 13, first and second the second elements are NOT 14 and 15, the controlled generator 16 and the element OR 17,

The delay unit 6 is connected by an output to the input of the synchronization pulse generator 10 and connected by an input to the input of the clock signal 18, connected to the control input of the code converter 9 and the control input of the first register 7. The output is connected to the information inputs of the code converter 9 connected to the outputs with information inputs of the second register 8, the Second register B is connected by a control input to the output of the generator of 10 clock pulses and is connected by an output to an input of an amplitude-frequency corrector 11 ,, Ktorov output connected to the input of the amplifier 3 records first register 7 is designed as a series-parallel register, the second register 8 in the form of their thirties two-bit parallel-to-serial converter register ,, and 9 code - in the form of binary code converter septenary.

The device also contains the first and second counters 19 and 20, connected by the first inputs to the outputs of the first and second single vibrators 12 and 13, respectively, and connected by outputs to the inputs of the OR element 17, connected by the output to the input of the first element HE 14, the seven-fold encoder Xe Iming 21 connected between the input information 22 and the information input of the first reamer 7, the Hamming 23 decoder connected by the output to the output bus 24 divider 25, frequencies, third register 25, decoder 26, additional block 27 of delay and full conversion the coder 28 code, made in the form of a parallel-parallel code converter,

Frequency divider 25 is connected by an input to the output of a divider of 5 clock pulses and connected by direct and inverse outputs to the inputs of the first and second oscillators 12 and 13, respectively, and to the inputs of a controlled generator

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5 20 25

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55 35

40

torus 16 connected by an output to the input of the second element NOT 15. The output of the second element 15 NOT is connected to the second inputs of the first and second counters 19 and 20 and to the control input of the third register 25 connected by an information input to the output of an additional delay block 27, which is connected by the input with the output of the imager 4 reproduced signal. The outputs of the third register 25 are connected to the information inputs of the additional converter 28 of the code connected by the outputs to the inputs of the de-: encoder 26, the latter is connected by the outputs to the information inputs of the Hamming decoder 23 connected by the control input to the output of the first element NO 14 connected to the control input of the additional 28 code converter.

The device works as follows

In the recording mode, the input bus 22 of the information on the seven-coder Hamming coder 21 receives a binary signal with twice the clock frequency. In this case, the seven-digit Hamming coder 21 generates a seven-fold signal with a nominal clock frequency. The signal of the seven-fold Hamming coder 21 is fed to the first register 7, which in parallel code forms three-bit binary combinations fed to the code converter 9. The latter converts seven-dimensional symbols into a seven-fold signal, which is most suitable for non-binary digital magnetic recording. From the outputs of the code converter 9, a semi-linear signal in the parallel code goes to the inputs of the second register 8, which converts the parallel code to a serial one. In this case, the synchronization of the first register 7 and the code converter 9 is carried out by clock pulses coming directly from the input bus 18 of the clock signal, and the second register 8 is synchronized by the same clock pulses transmitted through the delay block 6 and the driver 10 clock pulses. The serial code from the output of the second register 8 passes through the amplitude-frequency equalizer 11 to the recording amplifier 3, which, by means of the recording magnetic head 1, ensures the corresponding magnetization of the magnetic recording medium,

In the playback mode, the playback result from the magnetic recording medium is supplied from the reproducing magnetic head 2 to the imager 4 of the reproduced signal, acting on the additional delay unit 27 and on the extractor 5 clock pulses. Clock pulses from the output of the clock 5 clock pulses are supplied to a frequency divider 25 operating in the divide-by-two mode. The pulses from the direct and inverse outputs of the frequency divider 25 are fed to the first and second one-shot 12 and 13 and to the inputs of the controlled oscillator 16. The first and second one-shot 12 and 13 form short pulses, which go to the first and second counters 19 and 20, setting them to a given state. In this case, the first and second counters 19 and 20 begin counting the pulses received from the controlled generator 16 through the second element NOT 15. The first and second counters 19 and 20 produce resolution signals, which pass through the element OR 17 and the first element 14. to the control inputs of the Hamming decoder 23 and the additional code converter 28.

The additional code converter 28 is also affected by the third register 25, which receives a reproduced signal from the output of the additional delay element 27. The signal from the outputs of the additional transducer 28 is fed to the inputs of the decoder 26, which performs the transducer

15

recording and reproducing magnetic heads installed with the possibility of interacting with a magnetic recording medium and connected respectively to the output of the recording amplifier and to the input of the reproduced signal, connected to the input of the clock pulse selector, the delay unit connected by the output to the input of the sync pulse and input connected to the input bus clock signal connected to the control inputs of the code converter and the first register connected to the outputs the information inputs of the code converter, the outputs of which are connected to the information inputs of the second register connected by a control input to the output of the clock generator and the output to the input of the amplitude-frequency equalizer whose output is connected to the input of the recording amplifier, a controlled oscillator, the first and second single-oscillators, The first and second elements are NOT, the OR element, the information input bus and the output bus, characterized in that, in order to improve noise immunity without decreasing the digital density, first record, the first and second counters connected by the first inputs to the outputs of the first and second single-oscillators and the outputs to the inputs of the OR element connected by the output to the input of the first element NOT are inserted, the seven-fold Hamming coder connected between the input

20

thirty

by the bus of information and information, the formation of a four-bit parallel-40 input of the first register, a divisor of a binary combination into a three-bit d-rate, connected by an input to an output-output

parallel parallel binary combination corresponding to the restored seven-fold signal. The decoder 26 acts on the Hamming decoder 23, from the output of which the reconstructed and corrected binary signal with a doubled clock frequency is fed to the output bus 24,

The use of the invention allows - 50 holders connected to the input to significantly increase the travel of the imaged player.

signal, a third register, a decoder and an additional code converter, the output of the second element NOT 55 is connected to the second inputs of the first and second counters and to the control input of the third register connected by an information input to the output of the additional delay unit

noise immunity without reducing the density of a digital magnetic recording by correcting single and detecting duplicate errors.

Claims (1)

Claims An apparatus for digital magnetic recording-reproduction comprising 0 five recording and reproducing magnetic heads installed with the possibility of interacting with a magnetic recording medium and connected respectively to the output of the recording amplifier and to the input of the reproduced signal, connected to the input of the clock pulse selector, the delay unit connected by the output to the input of the sync pulse and input connected to the input bus clock signal connected to the control inputs of the code converter and the first register connected to the outputs the information inputs of the code converter, the outputs of which are connected to the information inputs of the second register connected by a control input to the output of the clock generator and the output to the input of the amplitude-frequency equalizer whose output is connected to the input of the recording amplifier, a controlled oscillator, the first and second single-oscillators, The first and second elements are NOT, the OR element, the information input bus and the output bus, characterized in that, in order to improve noise immunity without decreasing the digital density, first record, the first and second counters connected by the first inputs to the outputs of the first and second single-oscillators, and the outputs to the inputs of the OR element connected by the output to the input of the first element NOT, are inserted into the seven-fold Hamming coder connected between the input 0 0 clock divider and connected direct and inverse outputs to the inputs of the first and 45 STOporo one-shot and controlled oscillator connected by the output to the input of the second element NOT, the Hamming decoder connected by the output to the output bus, and outputs to information inputs, the control input of which is a supplementary code converter, connected to the output of the first element whose outputs are connected to inputs NOT connected to the control inputs of the decoder connected to the outputs of the additional code converter to the information inputs of the HeNH decoder 9: Fie.2