SU680030A1 - Method of recording digital information on movable magnetic carrier - Google Patents

Description

The invention relates to the field of instrumentation, namely to magnetic storage devices with a movable magnetic carrier, and can be used to record a 1 CDMA signal, for example, a digital encoded analog signal.

In many cases, it is advisable to record and accumulate code information directly into the device of the device in the mode of direct access without the use of a computer change. Of particular interest is the possibility of recording information in devices with large amounts of memory using mobile magnetic storage media, for example, magnetic tapes. Thus, the implementation of an autonomous recording allows recording vocabulary in speech synthesis devices or accumulating information from digital measuring instruments.

Methods are known for recording code signals on mobile magnetic carriers using sync path 1. However, the presence of a sync path reduces the recording density and complicates the recording process.

From (a recording method based on the formation of a clock signal in the form of a sinusoidal CRPVA and a code sequence of pulses and a subsequent change in the magnetization of the carrier upon receipt of pulses of the code sequence 2) is known.

The disadvantage of the described method is the impossibility of changing the information of sections within a previously recorded array without additional transformation of the entire array with a computer and re-recording.

The purpose of the present invention is to provide the possibility of recording additional information on a carrier.

The goal is achieved by first recording a sync signal corresponding to recording logical zeros, then reproducing it, and for recording a logical unit at a given segment interrupting playback, forming a recording pulse with a duration shorter than the sync signal nolopernod, changing the magnetization of the carrier on the opposite.

FIG. 1 shows the timing diagrams of currents in the recording head and the waveforms of this recording method, where: a is the clock signal;

b - write current pulses by the method

no return to zero; 8 - signal recording of the sync signal; g - repro sync pulses;

with writeable code codes

information;

e — sync reproduction resolution impulses; W - recording pulses in the universal magnetic head, taking into account the clock phase and the presence of information units; 3 - the signal waveform and

code sequence; and - reproducing pulses of the sync signal and code sequence;

K - selected pulses of the code sequence.

The method is carried out as follows.

The sync signal is preliminarily recorded (a), forming the recording current without returning to zero (b). When reproducing the EMF of a universal magnetic head of the corresponding waveform (c), reproducing clock pulses (d) are generated. After the selected sync signal is found, the playback (e) is interrupted and the recording logic is formed (l Depending on the phase of the reproduced sync signal (h). After the recording impulse ends, the reproduction continues (e). the logical unit of information | information will correspond, trn impulse, and each logical zero - one impulse (s).

Pa figs. 2 shows a block diagram of a device implementing this recording method. The OiHO contains a data driver 1, a control circuit for a time sequence of a write-play process 2, a clock extractor 3, a write amplifier 4, a clock phase tracking unit 5, a universal magnetic head 6, and a magnetic storage medium 7.

During the movement of the information carrier 7, the universal magnetic head 6 reproduces the synchronization signals, which

the synchromeste 3 selectors are formed, and the phase of the waveform is taken into account by the clock phase tracking unit 5. If there is a code sequence unit of the recorded information after the last sync pulse, the playback control 2 is turned on, which forms the recording current of the unit in the head b, which reversal the carrier 2 .

The use of this recording method provides the following advantages over existing methods: recording a code signal to a selected free track area of a movable magnetic carrier pre-marked by sync signals, and excluding a computer both during recording and when playing digital-analogue playback

signal.

Claims (2)

Invention Formula A method of recording digital information on a movable magnetic medium, based on the formation of a clock signal and a code sequence of pulses, the subsequent change in the magnetization of the carrier of the generated code sequence, characterized in that in order to provide the possibility of recording additional information on the carrier, first write the sync signal corresponding to the recording of logical zeros, then reproduce it, and to record the logical units in a given area interrupt playback, form a recording pulse with a duration shorter than the half-cycle of the clock signal, and then record it, changing the direction of the carrier magnetization to antisolar. Sources of information, taken into account Drie examination 1. French patent number 2338205, cl. О 11 В 5/02, published. 1975. 2. Instructions for installation and operation of the drive on a magnetic disk of the type EC-5052, Part 1, p. 8. AHO “Izot, Bulgaria, (prototype). p p p p p p p p p p p ° p p  At X / JL MJUIAJL1L J / -YX Y data