SU1597903A1 - Method and apparatus for magnetic recording/playback of digital data - Google Patents

Abstract

The invention can be used in data logging systems, data input / output devices in computing, digital audio and video recordings. The purpose of the invention is to increase the recording density and accuracy of the result of the reproduced signals. In the device implementing the method, after the N bits of the input information have entered the register 3, the synchronization signal on bus 2 sets the trigger 9 to "0". The output signals of the And 4 elements are fed to a group of inputs of the multiplexer 5. The output signal of the trigger 11 connects to the register the group of inputs of the multiplexer 5, i.e. Signals "0" of the D / A converter 6 track this signal, and it enters channel 7 as a reference level signal, and the amplitude of the next information level is measured relative to it. After the delay time of the element 8, the synchronization signal sets the trigger 9 to one, the elements AND 4 are open, so the N bits of the input signal are sent to a digital-to-analog converter 6, which forms the appropriate level for recording on the media. 2 sp.f-ly, 2 ill.

Description

2

The invention relates to the field of instrumentation, in particular to the magnetic recording of digital information on a magnetic recording medium, and can be used in data recording systems, data input-output devices in computing, digital audio and video recordings.

The purpose of the invention is to increase the recording density by increasing the number of resolved information levels, T t as well as the fidelity of the reproduction result by increasing the accuracy of restoring readouts of the levels of reproduced signals and increasing the reliability of self-synchronization during reproduction.

FIG. 1 shows the formation of a multi-level signal; in fig. 2 is a block diagram of a device implementing a method operation.

The cyutHOCTb technique of the proposed method consists in the following.

Signals of input binary digital information are converted into multilevels by an analogue conversion with a digit size n, where n is the number of binary bits of the input signal converted into one of the multilevel signal levels, and the number of allowed levels {2) is determined by resolution on amplitude of the recording-playback path. The amplitude of the reference level signals is then determined to be the maximum positive or negative value of the signal obtained by the digital-analog conversion, and

ten

15

high-frequency magnetization recordings on a magnetic recording medium; FIG. 1 as an example, the formation of a 1b-level signal is shown, n 4, 2 16.

The device (Fig. 2) contains an input bus 1 of a binary digital information signal, an input bus 2 of synchronization, register 3, elements I, a multiplexer 5, a digital-to-analog converter (D / A converter) 6, channel 7 direct magnetic recording with high-frequency biasing, and elements 3-7 are connected in series, and the input of register 3 is connected to the input bus 1, while the delay element 8, the RS-flip-flop 9, the NOT 10 elements and the counting flip-flop 11 connected in a certain way are connected to the input bus 2.

The input bus 1 is connected to the input of the register 3, the outputs of the bits of which are connected to one input of the elements; And L, the outputs connected directly and through the elements NOT 10 with the corresponding input groups of the multiplexer 5 whose output is connected via the DAC 6 to the channel input .7 The input bus 2 is connected to the S input RS-flip-flop 9 and to the counting input of the counting flip-flop 11, also through the delay element .8 to the R input of the RS trigger 9, the output connected to the other inputs of the AND 4 elements, vb (the stroke of the counting trigger 11 is connected to the control input of the multiplexer 5.

The number of bits of the register 3 elements and and NOT 10 is equal to n and for

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25

thirty

35

each cycle form the signal of the reference Q implementation of a 16-level signal

level and relative to it, the information signal level is read with the inversion of the signals of the reference and information levels in the adjacent

n A.

The device works as follows.

After receipt of n bits input

Clock tiers of the multilevel signal, the information received in register 3 is the sync signal

than the zero-level signal inversion in a given clock cycle is not performed if, in the preceding stage, the information level also had the maximum allowed value.

The duration of the cycles (signals "reference and information levels) is determined by the frequency resolution of the recording-reproducing path of the magnetic recording equipment.

The multi-level write signal generated by the indicated operations (Fig. 1) is recorded in a straightforward manner;

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55

the input bus 2 sets the trigger 9 to the zero state, while the output signals (logic O) of the AND 4 elements arrive at the first input group of the multiplexer 5. Let the output signal of the counting trigger I AND connect the first register of the multiplexer 5 to the first moment, those. D / A signals 6 track this signal (with a minimum level) and it enters channel 7 as a reference level signal, and the amplitude of the next is measured relative to it.

j o o

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15

5979034

high-frequency magnetization recordings on a magnetic recording medium; FIG. 1 as an example, the formation of a 1b-level signal is shown, n 4, 2 16.

The device (Fig. 2) contains input digital signal bus 1, synchronization input bus 2, register 3, elements I, multiplexer 5, digital-to-analog converter (D / A converter) 6, channel 7 direct magnetic recording with high-frequency biasing, and elements 3 -7 are connected in series, and the input of the register 3 is connected to the input bus 1, while the delay element 8, the RS flip-flop 9, the HE 10 elements and the counting flip-flop 11 connected in a certain way are connected to the input bus 2.

The input bus 1 is connected to the input of the register 3, the outputs of the bits of which are connected to one input of the elements; And L, the outputs connected directly and through the elements NOT 10 with the corresponding input groups of the multiplexer 5 whose output is connected via the DAC 6 to the channel input .7 The input bus 2 is connected to the S input RS-flip-flop 9 and to the counting input of the counting flip-flop 11, also through the delay element .8 to the R input of the RS trigger 9, the output connected to the other inputs of the AND 4 elements, vb (the stroke of the counting trigger 11 is connected to the control input of the multiplexer 5.

The number of bits of the register 3 elements and and NOT 10 is equal to n and for

20

25

thirty

35

implement a 16-level signal

n A.

The device works as follows.

After receipt of n bits input

information into the register 3 signal sync

the input bus 2 sets the trigger 9 to the zero state, while the output signals (logic O) of the AND 4 elements arrive at the first input group of the multiplexer 5. Let the output signal of the counting trigger I AND connect the first register of the multiplexer 5 to the first moment, those. D / A signals 6 track this signal (with a minimum level) and it enters channel 7 as a reference level signal, and the amplitude of the next is measured relative to it.

information level. After t (element 8 delay time), where t is the duration of a half cycle, the synchronization signal sets trigger 9 to one state, And elements will be opened, therefore the first n bits of the input signal go to the DAC b, which will form the corresponding information level for recording on the carrier

With the arrival of the next group of n bits, the synchronization signal will again set trigger 9 to the zero state and switch trigger 11, the output of which connects the second group of inputs of multiplexer 5 connected to the outputs of the AND elements via HE elements 10, therefore the DAC b will arrive Signals are not O, but logical 1, and the output of the DAC 6 will be the reference level corresponding to the maximum allowed level (the maximum negative level of the dynamic range of the converted DAC signal). Through to, the sync signal again sets trigger 9 to one state, however, n bits arrive at DAC 6 in the inverted value through the elements of HE.10, while the new information level will be counted relative to the inverse reference level.

Claims (2)

1. Method of magnetic recording-reproducing digital information, consisting in forming digital digital input signal from digital input signal and converting multilevel recording signal with a certain number of allowed information signal levels and with a reference signal level and direct recording of a multilevel signal with high frequency bias on the carrier magnetic recording, characterized in that, in order to increase recording density by increasing the number of information levels allowed, as well as of the quality of the reproduction result by increasing the accuracy of restoring the readings of the levels of reproducible signals five 0 five and increasing the reliability of synchronization during playback, the signals of the reference levels, the amplitude of which corresponds to the maximum positive or negative values of the dynamic range of the signal obtained as a result of analog-to-digital conversion, form in each cycle a multilevel signal before the signal level of the given cycle , with the inversion of the signals of the reference and information levels in the adjacent bars of the multi-level recording signal, and the version of the signal of the zero information level in this cycle is not produced, if in the previous cycle the information level has the maximum allowed value. 2. A device for magnetic recording-reproducing digital information from magnetic media containing an input bus of binary digital information signals and an input synchronization bus, a register, a multiplexer, a digital-to-analog converter and a direct magnetic recording channel with J-high-frequency bias, characterized in that In order to increase recording density and fidelity of the playback result, the elements AND, NOT, the delay element, the RS flip-flop and the counting flip-flop are entered into it, while the input bus of the dual digital and Formations are connected to the register input, the outputs connected to the same inputs of the And elements, whose outputs directly and through the elements are NOT connected to the corresponding groups of multiplexer inputs, the input synchronization bus is connected to the S input of K5 trI1ger and to the counting input of the counting trigger , and through the delay element -: with RS RS-flip-flop, the output connected to the other inputs of the I elements, the output of the counting trigger is connected to the control 1) with the multiplexer input, the outputs of which are connected via a digital-analog converter Valid channel to forward a high-frequency magnetic recording substitution - demagnetization. f ( Editor L.Gratillo "G .o" O-t "eM -O  "Т T Ch" Compiled by A. Lukanin Tehred m. Didyk. Proofreader S.Shevkun Order 3057 Circulation VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology 113035, Moscow, Zh-35, 4/5, Raushsk nab. Subscription