SU980138A1 - Device for recording-reproducing magnetic information onto-from magnetic carrier - Google Patents

Description

The invention relates to computing and can be used in devices-digital magnetic recording.

A device for recording binary information on magnetic media for recording information using a two-frequency recording method is known, comprising an inverter, two elements, three one-oscillators, two AND elements, an OR element, a counter, two recording amplifiers and a magnetic head. The device generates a recording signal in which the intervals between adjacent drops in the recording current are 2/3 G and T, where T is the clock interval of the recorded sequence 1 The disadvantage of the device is the low recording density.

It is also known a record-playing device containing an EXCLUSIVE OR circuit, two triggers, a recording-reproduction amplifier, a magnetic head, five transition detectors, five multivibrators, an OR circuit, and two AND-circuits. The device generates a recording signal in which the intervals between adjacent current switches records are IT, 1.5T and 2T 2.

The drawback of the device is the low recording density that it allows to get.

The closest in technical essence to the present invention is a device that contains a first converter connected in series, made of three AND schemes, an OR circuit, an inverter,

10 two delay elements and a trigger, a recording circuit, a magnetic head, an amplifier driver, and a second converter made of a pulse driver, a generator, 15 AND circuits, an OR circuit, three inverters, six delay elements, and two triggers. The device works as follows. The digital sequence to be recorded on the magnetic medium in the first converter is converted into a code sequence convenient for za-. pisi The code sequence is fed to the magnetic head through the recording circuit. During playback, the signal removed from the magnetic head through the amplifier-driver comes to the second transducer, which reverses the code sequence.

The device generates a recording signal in which the intervals between transitions of the recording current are IT, 15Т and 2TC3

The disadvantage of the device is low recording density. This disadvantage is due to the fact that the minimum distance between adjacent transitions of the write current is 1T. With a high recording density, the individual impulse responses to each recording current transition may overlap, which leads to distortion of the reproduced signal and prevents further increase in recording density.

The purpose of the invention is to increase the recording density.

The goal is achieved by the fact that in a digital recording and playback device on magnetic media containing serially connected first converter, the first and second inputs of which are information and synchronizing inputs of the device, respectively, recording amplifier, magnetic head, playback amplifier and second converter, the first and the second outputs of which are respectively informational and synchronizing OUTPUTS

devices, the first converter contains the first sequential register for four bits, the first trigger, the first decoder, the second register for eight bits, the second trigger and the AND circuit, the recording input of the first register connected to the information input of the device, the synchronous input of the first register through the first trigger, and the sync-input of the second register is directly connected to the synchronizing input of the device, the output of the first register through the first decoder is connected to the input parallel, recording information of the second register, input The I circuits are connected to the outputs of the sixth and seventh bits of the second register, and the output to the mode selection input of the second register, the output of which is connected via the second trigger to the output of the first converter, and the second converter contains the third, fourth and fifth registers to eight, three and four bits, respectively, a synchronized generator, a second decoder, and a third trigger; the input of the second converter is connected to the input of the third recording sequence record and the input of the synchronized generator, the output of which is connected to the synchronous input of the third register and through the trigger to the synchronous inputs of the fourth and fifth registers and the synchronizing output of the device, the output of the third register is connected to the input of the second decoder, the first output of which

connected to the second input of the third trigger, and the second and third outputs to the parallel recording inputs of the Fourth and fifth registers, respectively, the inputs for selecting operating modes of which are connected to the output of the fourth register, while the output of the fifth register is connected to the information output of the device.

Figure 1 presents the structural diagram of the proposed device; Fig. Table replacement codes; FIG. 3 shows timing diagrams explaining the operation of the first converter; Fig. 4 (state table of the first decoder; Fig. 5 - timing diagrams explaining the operation of the second transducer; Fig. 6 - table of states of the second decoder; Fig. 7 graphs of the signal spectrum.

The circuit (Fig. 1) contains informational 1 and synchronization 2 inputs, first converter 3, recording amplifier 4, magnetic head 5, playback amplifier 6, second converter 7, information 8 and synchronizing 9 outputs, first register 10 containing four bits, the first trigger 11, the first decoder 12, the second register 13, containing eight bits, circuit AND 14, the second trigger 15, the third register 16 containing eight bits, the synchronized generator 17, the second decoder 18, the third trigger 19, the fourth register 20, containing three ranks and the fifth register 21, comprising four bits.

The basis of the device based on the following principle.

The input sequence to be written to. magnetic media, swallow words, two, three or four characters, depending on the character values of the input sequence. Each word is replaced with a code sequence word containing four, six, or eight characters, respectively. In this case, if we assume that each character of the input sequence occupies the clock interval T, then each character of the code sequence occupies half of the clock interval 1 / 2T.

Claims (3)

1. USSR author's certificate tf 656101, cl. G 11 In 5/09, published. 1979 2. Patent IT 369556,., Cl. G 11 On 5/06, published 1972. 3. US Patent 341894, cl. 340174 .1, published. 1968 (prototype). rig. / FIG. four ftJ A . 2 лтг1Г1гтллшшл шгтплл FIG. b