SU1764084A1 - Device for digital magnetic recording - Google Patents

Description

one

(21) 4824509/10

(22) 07.05.90

(46) 09/23/92. Bul No. 35

(71) Almaz Central Design Bureau

(72) Yu.I. Gorokhov

(56) USSR Author's Certificate Ns 1316037, cl. G 11 B 20/10, 1987.

(54) DEVICE FOR DIGITAL MAGNETIC RECORDING

(57) The invention relates to the field of magnetic recording, namely, devices for

digital recordings. The aim of the invention is to improve the speed of the device by simplifying the transcoding. The essence of the invention: a device for digital magnetic recording contains 1 counter / 6 /, 1 block / 5 / elements AND, 2 elements OR 3, 8, 1 counting trigger / 9 /, 1 element 2И-OR / 4 /, 1 static register / 1 /, 1 adder / 2 /, 1 distributor / 7 / pulses. 1-2-7-5-8-9, 6-2, 1-4-5, 1-3-5.

cl

with

XI o

N O 00

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

A device for recording digital information on a.s. USSR No. 1316037 (Mkl. G 11 B 20/10, 1987). In this device, the recording signal provides the ability to clock and group self-synchronization of the information signal during playback. However, due to the fact that the source information is divided into six-bit groups, it is difficult to work with digital information sources in which this information is represented by byte constructions (the length of the layers used is a multiple of the integer number of bytes).

The closest in technical essence to the proposed technical solution is a device for recording digital information on a.s. USSR No. 1435305 (μL G 11 B 5/09, 1989.). This device contains a synchronization block, five AND elements, a counter, a block of permanent memory, three OR elements, a shift register, a counting trigger, and recording amplifiers. In this case, the device provides the formation of a recording signal with an increased information capacity, and when coding, the initial information is divided into groups of seven bits. However, this device is functionally complicated and, therefore, contains redundant equipment, which reduces the reliability of its operation.

The aim of the invention is to reduce equipment costs, improve the operational properties of the device and functional simplifications.

For this purpose, a digital magnetic recording device containing a counter, a block of AND elements, the first and second OR elements with a counting trigger connected in series to the second OR element, and the output of the device as well as an II-OR element are additionally introduced —Gistr, adder, pulse distributor, while the counter input, combined with the pulse distributor pulse input, is the clock signal input, and the static register inputs are the information inputs of the device. The outputs of the counter and the first group of outputs of the lower bits of the static register are connected to the corresponding inputs of the adder, the outputs of which are connected to the control inputs of the pulse distributor. The first inverting input of the first element OR, combined with the inverting first input of the first element AND element 2И-OR, the second inverting input of the first element OR, combined with the second input of the first element AND and the first input of the second element AND element II-OR, and the third input of the first element OR, combined with the second input of the second element AND element 2И-OR, are connected respectively with the second group of outputs of the higher bits of the static register. The output of the counter, which is the output of the information request signal to the input of the device, is connected to the first input of the second OR element. The group of second inputs directly and the group of third inputs of the second element OR are connected through the block of elements AND via the first pulse inputs to the corresponding outputs of the first and second groups of outputs of the pulse distributor. The second control inputs of the AND block are connected to the corresponding outputs of the static register, which form the third group of outputs, as well as the outputs of the first OR element, element 2И-OR and the outputs from the second group of outputs of the static register connected to the first and third inputs of the first OR element.

As a result, in the proposed technical solution, compared with the known, the equipment costs are reduced and the operation and improvement of operational properties, in particular reliability indicators,

The author is not aware of other technical solutions that contain the distinguishing features of the claimed technical solution.

The drawing shows a functional diagram of a device for digital magnetic recording. In the drawing and in the text the following notation is accepted:

1- static register;

2- adder;

3- the first element OR; 4-element2I-OR;

5- block of elements AND;

6- counter;

7- pulse distributor:

8- the second element OR;

9-count trigger; the element AND in the block of elements AND;

parallel connection of elements And by control inputs;

31 - signal at the output of the first element OR;

AA signal at the output of the element 2I-IL AND;

Ho ... x - signals at the outputs of the static register;

Wo ... U15 signals at the outputs of the pulse distributor;

Zo.-.Za - signals at the outputs of the counter.

The device for digital magnetic recording contains a static register 1, the inputs of which are the information inputs of the device, and the outputs of the first three (xo, xi, xa) bits that make up the first group of outputs are connected to the first inputs of the adder 2, the outputs of the three most senior (HB, xb, x) bits that form the second group of outputs are connected respectively to the first inverting inputs of the first element OR 3 and the first element AND element 2И-OR 4, to the second inverting input of the first element OR 3, the second input of the first element AND and the first in the second element AND 2I-OR 4 and the third input of the first element OR 3 and the second input of the second element AND 2I-OR 4, the outputs of the remaining bits (xs, X4) and two outputs (xs, x) from the second groups of outputs of static register 1 are connected to the corresponding inputs of block 5 of elements I, counter 6, whose input combined with pulse input of pulse distributor 7, is the input of the device clock signals, output of bits is connected to second inputs of adder 2, and output of the signal of the end of the counting cycle is connected to the first input of the second the element OR 8 and is the output of the device information request signal, the first part of the outputs (Ou, Ou, U12) of the distributor 7 pulses is connected directly to the first group of inputs of the second element OR 8, and the second part through the block 5 elements AND through its first pulse inputs - with the second group of inputs of the second element OR 8, and the output is the output of the device.

A device for digital magnetic recording, made in accordance with the functional diagram shown in Fig. 1, provides for the formation of a recording signal with an information capacity of 41.6 bits for a minimum period with a ratio of the minimum and maximum intervals between adjacent 1: 4 switches and can be implemented as a clock and group self-synchronization of the playback signal.

Functionally, the recording signal is formed by dividing the initial information into groups of eight bits each and converting these groups into ten bits of code groups, from which the recording signals are formed using the BVNM method. Code conversion is carried out by polling in a certain order of nine code values formed directly by the values of the bits of the code being converted,

a logical transformation of a part of the bits of the code being transformed, with interleaving in certain clock cycles with constant code zeros and ones, with the last tenth bit of the transformed code always containing a code unit.

In accordance with the above device operates as follows.

The code of digital information entering the device input is entered into a static register 1, from the outputs of which the code signals of bits go to the inputs of the adder 2, the first element OR 3, the element 2И-OR 4 and the block of elements AND 5. According to the synchronization signals coming from the input devices to the input of the counter 6 and the pulse input of the pulse distributor 7, the counter 6 receives successively ten states from 0000 to 1001. In addition, every tenth synchronization pulse passes to the output of the counter 6, while returning the counter 6 to the initial state the

The status code (Zo-.Zs) of counter 6 is summed by a four-bit adder of binary CODES 2 WITH a STATUS CODE (XO ... X2)

the three lower bits of the static register 1, and the resulting sequence of signals of the sum codes goes to the control inputs of the pulse distributor 7. As a result, the outputs of the pulse distributor 7 form a ten-fold sequence of pulses, Y | + 1, .. At | + d), coming either directly or through the first pulse inputs of the block of elements I5 to the inputs of the second element OR 8. The signals at the outputs of the distributor 7 pulses in their numbers correspond to the code number of the sum formed at the output of the adder 2

Block 5 And elements on the second inputs is controlled by signals from the outputs of the static register 1, as well as the first element OR 3 and element 2I-IL And 4.

The formation of a code unit in the tenth cycle of the recoded information is provided by the arrival of a signal from the output of counter 6 to the input of the second element OR 8.

In this way, a recording signal is generated with a ratio of time intervals between adjacent 1: 2: 3: 4 switchings and an information capacity of 1.6 bits of source information per minimum recording signal period. In addition, in every tenth of the recording signal, a mandatory switch will be made, which ensures that

implementation of group self-synchronization of the playback signal.

The generated code of the recording signal (the sequential code at the output of which of the element OR 8) can be described by the relation that reflects the five most significant bits of the code being converted into a nine-bit group:

A (xs; X4; X5.1 xv; x) Ohzkh-s 1aixs 32x7 1, which is subjected to a cyclic shift by the number of bits equal to the numerical value of the three least significant bits of the code of the information being converted.

The technical and economic effect of using the proposed technical solution is associated with reducing equipment costs and at the same time simplifying the operation of the device. For example, in comparison with the prototype, the block of permanent memory is excluded from the number of used functional elements. Achieved equipment cost savings and simpler functional design improves device reliability.

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Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A digital magnetic recording device comprising a counter, an AND block, a first and a second OR element with a counting trigger connected in series to the second OR element, the output of which is an output of the device, and also an element 2I-OR, characterized in that in order to increase the device speed by eliminating auxiliary operations during the transcoding process, it is additionally equipped with a static register, adder and ra- pulse limiter, the counter input combined with the pulse pulse pulse input is the sync pulse input, and the static register outputs are the device information inputs, the counter outputs and the first group of low-order outputs of the static register are connected to the corresponding inputs of the adder, the outputs of which are connected to the control inputs of the pulse distributor, the first inverting input of the first element OR, combined with the inverting first input of the first element AND element 2I- OR, the second in15 is the rotary input of the first element OR, combined with the second input of the second element AND element 2И-ИИ And, and the third input of the first element OR, combined with the second input of the second element И element 20 and 2И-OR, are respectively connected with the second group of senior Dust static register, the counter output is connected to the first input of the second element OR, the group of second inputs directly and 25, a group of third inputs of the second element OR is connected via the block of elements AND via the first pulse inputs connected to the corresponding inputs of the first and second groups of outputs of the pulse distributor, the second 30 control inputs of the block of elements AND are connected to the corresponding outputs of the static register forming the third group of outputs, as well as the outputs of the first OR element, element 2И-OR and 35 outputs from the second group of outputs of a static register connected to the first and third inputs of the first OR element.