SU966738A1 - Device for seaching information on magnetic record carrier - Google Patents

Description

(5) DEVICE FOR SEARCHING INFORMATION ON A MAGNET RECORDER MEDIA

one

The invention relates to the field of information storage, namely, devices for searching information on a magnetic recording medium.

A device for searching information on magnetic recording media is known, which contains a gap detection unit whose input is connected to a magnetic head.

This device has a relatively simple design, however, it does not allow for a sufficiently simple process of searching for information on a magnetic recording medium.

It is also known a device for searching information on magnetic media, containing a gap detection unit whose input is connected to a magnetic head, and an output to a pulse shaper connected via a reversible counter to the first input of an address comparator, the first output of which is connected to the first one. moving the magnetic recording medium, and a control key block, the first and second outputs of which

5 are connected to the second inputs, respectively, of the address comparator and the control unit for moving the magnetic recording medium.

The known device allows

10 to ensure the relative simplicity of the process of searching for information on a magnetic recording medium, but its disadvantage lies in the significant error in the search for information in the reverse

15 direction.

The purpose of the invention is to reduce the error of information retrieval in the opposite direction.

The goal is achieved by

20 that a recording unit, connected by the first input to the output of the block, is inserted into the device for searching information on magnetic recording media

pause detection, and an AND element connected in series, an error register and a correction signal driver connected to the input of a reversible counter by the output. In this case, the third output of the control key block is connected to the input of the error register and to the second input of the registration block, the output of which is connected to the first input of the And element connected to the second and third inputs, respectively, to the second output of the comparator and to the fourth output of the control key block.

The drawing shows one of the possible variants of the proposed device for searching information on a magnetic recording medium.

The proposed device comprises a gap detection unit 1, the input of which is connected to the magnetic head 2, and the output to the shaper of 3 pulses. The latter is connected via a reversible counter k with the first input of the address comparator 5, the first input of which is connected to the first input of the movement control unit 6 of a magnetic recording medium, for example a magnetic tape. The device also contains a control key unit 7, a registration unit 8 connected by the first input to the output of the pause detection unit 1, And 9 connected in series, an error register 10 and a correction signal generator 11 connected by the output to the reversible counter input k. In this case, the first and second outputs of the control key unit 7 are connected to the second inputs of the address comparator 5 and the movement control unit 5 of the magnetic recording carrier, respectively.

In the proposed device, the third output of the control key unit 7 is connected to the input of the error register 10 and to the second input of the registration unit 8, the output of which is connected to the first input of the And 9 element. The second and. the third inputs of the element And 9 are connected respectively to the second output of the address comparator 5 and to the fourth input of the control key block 7.

In the device, in the search process, the gap detection unit 1 generates square-wave pulses, the duration of which corresponds to the duration of the sections of information recorded on the magnetic recording medium. In this case, the pulse shaper 3 changes the state of the reversible counter 4 by one in

depending on the direction of movement of the magnetic recording media. The address comparator 5, depending on the state of the reversible counter A and the number of the required section, generates a signal arriving at the AND 9 element to which the high level of the registration block 8 is also generated, generated by the signal of the control keys 7 at the stop command head 2 is within an information region; At the same time, if the number of the required piece of information is less than or equal to the contents of the reversible counter A, and the start signal is sent to the element 9 of the control key block 7, then error register 10 is entered from the unit, and from the generator 11 of the correction signal the counter pulse. The latter provides accelerated movement of the magnetic recording medium in the opposite direction.

The use of the invention allows to significantly reduce the error of information retrieval in the opposite direction.

Claims (2)

Invention Formula 35 A device for searching information on a magnetic recording medium containing a gap detection unit, the input of which is connected to the magnetic head, and an output to a pulse shaper connected via a reversible counter to the first input of the address comparator, the first output of which is connected to the magnetic carrier records, and a control key block, the first and second outputs of which are connected to the second inputs, respectively, of the address comparator and the control unit Record, characterized in that, in order to reduce the information retrieval error in the reverse direction, a recording unit is connected to it, connected by a first input to the output of the pause detection unit, and an AND element connected in series, an error register and a correction signal generator connected to the output the input of the rotation counter, the third output of the 6th control key unit is connected to the input of the error register and to the second input of the registration unit, the output of which is connected to the first input of the And element connected to the second th and third inputs respectively to 9667 I 10 11 86 to the second output of the address comparator and to the fourth output of the control block block. Sources of information taken into account in the examination 1. US patent 1G {(OYOZE, class 360-72, 03.22.77. 2. Japanese Patent M 50-10125, cl. 102 E 213.2, I8.0t.75 (prototype).