SU1365121A1 - Device for searching section on tape recording medium - Google Patents

Description

(21) 4085872 / 24-10

(22) 08.05 „86

(46) 07 „01„ 88, Bup. 9 1

(72) A.I.Bakulin and AoA.Bakulin

(53) 681.84.001.2 (088.8)

(56) USSR Author's Certificate No. 764524, cl. G 11 V 15/06, 1979.

USSR author's certificate 902058, cl. G 11 B 5/09, 1980.

(54) DEVICE TO SEARCH FOR A SITE OF RECORDING ON A BELT MEDIA RECORDER

J (57) The invention relates to information storage devices. The purpose of the invention is to reduce the error

search by increasing the number of search modes. The device operates in a zoe, coordinate or time search mode. Depending on the selected search mode, the specified address of the tape section is entered as a code for the coordinate of the start of recording, the tape zone number and the recording code for the recording time code in the corresponding final address in the address input block. Providing any of the three data search and self-tuning modes allows you to pair your search device with different drives. 2 yl "

with

Od

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

The aim of the invention is to reduce the search error by increasing the search modes.

Figo is a functional diagram of the device for searching a recording area on a tape recording medium; Fig. 2 is a functional block diagram of the control unit.

The device contains an address information input unit 1 connected by outputs to the first inputs of the first 2 and second 3 comparators connected by outputs to the first, second, third and fourth inputs of control block A connected by a control input to the Start bus 5 and outputs from the control inputs of the accumulator 6 on a magnetic tape, made with the outputs of the indication of the flow rate of the tape recording medium and information, and the generator 7 of pulses connected by an output to the first input of the first element I 8 connected by a second input with the corresponding The control bus 9 and the output with the first input of the SHSh 10 element connected by the second input to the output of the second element 11, connected by the first input to the corresponding control 9, and the second input to the output indication of the storage tape storage medium 6 on the magnetic a tape and an output with an input of a reversible counter 12 pulses connected by control inputs to the corresponding outputs of the second comparator 3 and an output to the second input of the first comparator 2. The device also contains series-connected blocks to memory 13 and the third comparator 14

In addition, the device contains a third element AND 15 connected by a first input to the corresponding control bus 9, a second input c - information output of the storage device 6 on a magnetic tape and an output c - the third input element OR 10, the first 16 and the second 17 code adders, the first 18 and second 19 encoders, first 20, second 21, third 22 and fourth 23 switches, and control unit 4 contains first 25, second 26, third 27 and fourth 28 elements OR, first 28, second 29, third 30 and fourth 31 elements And, switch 32, a generator of 33 pulses and

register 34, the first 30, second 21, and third 22 switches are connected by the first and second control inputs to the corresponding outputs of the second comparator 3, the first adder 16 codes connected by inputs to the outputs of the reversing counter 12 and the third switch 22 and the output to the second input second comparator

3 and to the interconnected first inputs of the first 20 and second 21 com Iyatatopov, connected by second inputs to the corresponding output of the block 1 input address information and outputs through the first adder 16

codes and directly, respectively, to the inputs of the second adder 17 codes, connected by an output to the first inputs of the memory block 13 and the fourth switch 23, the last of which is connected to the second input

the corresponding output of control unit 4, the control input to the output of the third comparator 14 and the output to the first input of the third comparator 14 connected to each other and the second input of the memory block 13 connected to the second comparator 14 connected to each other, to the first input of the third switch 22 and the second input of the third switch 22 through the second encoder 19; in the control unit 4, the switch is connected to the first input of the first element OR 24 by the first input and is the control input of the control unit 4 and, the second input of the switch 32 is connected to the interconnected output of the pulse generator 33 and the first inputs

the first 28, second 29 and third 30 And elements, the last of which is connected to the first input of the fourth element OR 27 and the second input to the second input of the first OR element 24, which is the first input of control unit 4, the second and third inputs of which are connected to the third and the fourth inputs of the switch 32 connected by the fifth input to the fourth input of the switch 32, the unit

4 control and the first input of the fourth element And 31 connected by the output to the third input of the first element OR 24, and the second input

 3

to the first output of the register 34 connected by the second output to the fourth input of the first element OR 24, to the second input of the first element AND 28 and to the second input of the second element And 29 connected by the output to the first input of the third element OR 26 connected by the output to the input of the register 34 and the second and the third inputs with the first and second outputs of the switch 32 and the second input of the fourth element OR 27, while the second element OR 25 is connected by the first and second inputs to the output of the first element 28 and the third output of the switch 32, and the outputs of the second 25 andthe fourth 27 elements OR and the first and second outputs of the switch 32 are the outputs of control unit 4

The device operates in eon, coordinate or time search modes. Depending on the selected search mode, the address specified for the tape segment is entered as a code for the coordinate of the start of recording, the number of the tape zone to be searched for or the time code for the recording at the corresponding end address in the address input block 1

In the coordinate search mode, which hardly differs from the temporary specified tape consumption code entered in the address input block 1, it is compared with the actual one coming from the reversing counter 12 via the first adder, G; F or 3 F, goes to control block 4, and 3 F and 3 F to switches 20-22. If, then the code of the reversible counter 12 is fed through the switch 20 to the encoder 18 for converting, to the additional code that is fed to the second adder 17 simultaneously with the initial specified tape consumption code from the address input block 1 through the switch 21. When the egm in the adder 17 occurs subtracting the actual tape consumption code from the given initial one and thereby determining the length of the tape run in the rewind mode. This value is used as the cell address of the memory unit 13, in which the tape stopping distance (stick out) value is stored. This value is output from the memory unit 13 via the switch 22 to the first adder 16, where it is added to the actual tape consumption code, pos1214

It is stupid from the counter 12. This is how the total value of the actual flow rate of the tape with anticipation is formed, taking into account the forthcoming run of the tape when it stops. This value is obtained almost instantly in a single cycle of operation of the device, in contrast to the rather complex multi-cycle procedure for determining the same value in a known device.

When a start signal is applied in control unit 4, the pulse generator 33 is started through the OR element 2 and its impulse, passing through the switch 32, is used to turn on the accumulator 6 in the rewind mode and to set the register 34 through the OR element 26 to the first state when there is a high potential for its first exit. The rewind continues until the pre-determined value of the actual flow is compared with the target. Then the comparator 3 pulls the coincidence signal 3 F to the switch 32 and the AND 31 element, which starts the pulse generator 33 for the second time to form the Stop command using AND 29 and OR 27. At the same time, the register 35 switches to the second state from the element And 29 through the element OR 26 The signal from the second output of the register 35 for the third time starts the generator 33 through the element OR 24, which is used as a replay pulse command. When playing in the first comparator 2, the final tape consumption address from the address input block 1 and the actual one coming from the reversing counter 12 is compared. When these codes coincide, the section with the record of the search message ends and the fourth pulse generator 33 is started through the OR 24 element , and the element And 30 forms the Stop command, which arrives at drive 6 through the element OR 27 ".

The search at a given tape consumption less than the actual one is performed in the rewind mode. In this case, in order to determine the forward lead (advance) in the memory block 13, it is necessary to subtract the given value from the actual tape consumption code, which is done by feeding to the adder 17

5 i

the actual tape consumption code through the second switch 21 by the signal, and the target one through the first switch 20 and the encoder 18 (i.e., in reverse order relative to the mode). The lead code selected from memory 13 using the second encoder 19 is translated into an additional code and through the third switch 22 is fed to the first adder 16 codes for subtraction from the actual consumption code. Next, the search process is repeated without changing

The actual actual consumption code of the tape, stored in the reversible counter 12, does not undergo any distortion when searching, which should be considered as a condition of high reliability of the search for the tape segment “

During operation, natural wear of the brakes in the accumulator 6 occurs, which gradually leads to an increase in the stopping distance. This makes it necessary to correct those lead values that are stored in memory block 13 With the help of the second adder 17 of the switch codes 20 and 21 and the first encoder 18, the actual stopping distance is determined at each braking. The selected value of the forward is compared by the third comparator 14 with the logical value of the stopping distance, the code of which goes to the third comparator 14 through the fourth switch 23 when the Play command is output at the output of the control unit 4. If the actual stopping distance code, which is the difference between the actual discharge code from counter 12 and the specified initial code, measured when the tape was completely stopped, exceeds the value stored in block 13 of the memory at the specified address, a new updated value of the lead is recorded. in block 13 of the memory of the second adder 17 codes via switch 23 This procedure is used to configure the search device in conjunction with drive 6, the dynamic characteristics of which are not known. Setting the specified addresses from the beginning of the tape through each meter for 10-12 runs back and forth in block 13 of memory, get the exact values of the braking distances, which then auto216

mathematically refined in the process. As a rule, the acceleration of the tape into the accumulator 6 (where the braking distance changes most intensively) is completed at a section of the tape of no more than 10-12 m and then practically does not change, therefore the memory block 13 has a small volume.

The zonal data search option at the stroke speed is performed without using the indicated circuit capabilities. The device is immediately switched to playback, and the data is sampled after the second comparator 3 generates a match signal of the specified zone code from the address input unit 1 and the code the actual zone coming from the reversing counter 12

The time or zone search at the speed of rewinding is no different from the coordinate search. The time search is performed by signals from the pulse generator 7.

The provision of any of the three data retrieval modes and self-tuning makes it possible to interface the search device with various accumulators 6 (,

Formula of invention

A device for searching a recording site on a tape recording medium, comprising an address information input unit connected by outputs to first inputs of the first and second comparators connected by outputs to first, second, third and fourth inputs of a control unit connected by a control input to a Start bus and outputs the control inputs of the tape drive made with the outputs of the flow indicator of the recording and information tape media and the pulse generator connected by the output to the first input of the first And connected by the second input to the corresponding control bus and output to the first input of the OR element connected by the second input to the output of the second And element connected by the first input to the corresponding control bus, the second input to the output display of the tape drive's storage medium on the magnetic tape and output from the inputs

a reverse pulse counter connected by control inputs to the corresponding outputs of the second comparator and an output to the second input of the first comparator, as well as a memory unit and a third comparator connected in series, characterized in that, in order to reduce the search error, a third element I is entered into it connected by the first input to the corresponding control bus, the second input to the information output of the tape drive and the output to the third input of the OR element, the first and second code adders, the first and the second encoder, the first, second, third and fourth switches, and the control unit contains the first, second, third and fourth elements OR, first, second, third and fourth elements AND, the switch, the pulse generator and the register, the first, second and third the switches are connected by the first and second control inputs to the corresponding outputs of the second comparator, the first code adder is connected by inputs to the outputs of the reversible counter and the third switch and the output to the second input of the second comparator and interconnected The first inputs of the first and second switches connected by the second inputs to the corresponding output of the address information input unit and the outputs through the first code adder and directly respectively to the inputs of the second code adder connected by the output to the first inputs of the memory block and the fourth switch, the last of which is connected to the second input the corresponding output of the control unit, the control input to the output of the third comparator and the output to the first input connected between the oboe

The third comparator and the second input of the memory unit connected by the output to the second central input of the third comparator connected to each other, the first input of the third switch and the second input of the third switch through the second pfraftor, while in the control unit the switch is connected by the first input to the first input of the first element OR and is the control input of the control unit, the second input of the switch is connected to the interconnected generator output of 5 pulses and the first inputs of the first, second and third elements And, the last of which is connected to the first input of the fourth element OR and the second input to the second input

0 of the first OR element, which is the first input of the control unit, the second and third inputs of which are connected to the third and fourth inputs of the switch connected by the fifth input to

5 by the fourth input of the control unit and the first input of the fourth AND element connected by the output to the third input of the first OR element and the second input to the first output of the register,

0 connected by a second input to the fourth input of the first element OR, to the second input of the first element AND, and to the second input of the second element AND connected by the output to the first

5 to the input of the third OR element connected to the input of the register, the second and third inputs with the first and second outputs of the switch and the second input of the fourth element OR,

0, the second OR element is connected by the first and second inputs to the output of the first element AND to the third output of the switch, and the outputs of the second and fourth element OR and the first and second outputs of the switch are the outputs of the control unit.

5 ./Guo (

Claims (1)

Claim A device for searching for a section of sleep code of the actual brake-dr to the first static value of the braking distance, the code of which arrives at the third comparator 14 through the fourth switch 23 when the Play command appears at the output of the control unit 4. Of the first path, which is the difference between the actual flow code from the counter 12 and the specified initial code, measured when the tape was completely stopped, exceeds the value stored in the memory unit 13 at the specified address, then the new updated lead value is recorded in the memory unit 13 of the second adder 17 codes through switch 23. This procedure is used to configure the search device when paired with drive 6, the dynamic characteristics of which are not known. By setting the specified addresses from the beginning of the tape every meter for 10-12 runs back and forth in the memory unit 13, exact braking distances are obtained, which are then autrecorded on a tape recording medium containing an address information input unit connected to the first inputs of the first and second comparators connected to the outputs, the second, third and fourth inputs of the control unit connected by the control, the input with the Start bus and the outputs with the control inputs of the drive on a magnetic tape 45, made with outputs in a dictator of the consumption of tape recording media and information, and a pulse generator connected to the first input of the first AND element connected to the second input with the corresponding control bus and the output to the first input of the OR element connected to the output of the second AND element connected to the first input with the corresponding control bus, the second input with the output of the indication of the flow rate of the tape recording media on the magnetic tape and the output from the inputs of the reversible pulse counter connected to the control the input inputs to the corresponding outputs of the second comparator and the output to the second input of the first comparator, as well as a memory block and a third comparator connected in series, characterized in that, in order to reduce the search error, the third element And connected to the first input with the corresponding control bus, the second input with the output of the information of the tape drive and the output with the third input of the OR element, the first and second code adders, the first and second encoders, the first, second, third and fourth comm tators, and the control unit contains the first, second, third and fourth elements of OR, the first, second, third and fourth elements of And, a switch, a pulse generator and a register, and the first, second and third switches are connected by the first and second control inputs to the corresponding outputs the second comparator, the first code adder is connected by inputs to the outputs of the reverse counter and the third switch and by the output to the second input of the second comparator and to the first inputs of the first and second switches interconnected, connected the second inputs to the corresponding output of the address information input unit and the outputs through the first code adder and directly, respectively, to the inputs of the second code adder connected by the output to the first inputs of the memory unit and the fourth switch, the last of which is connected by the second input to the corresponding output of the control unit, the control input - to the output of the third comparator and the output to the interconnected first input of the third comparator and the second input of the memory block connected by the output to the connected between the second input of the third comparator, the first input of the third switch and the second input of the third switch through the second encoder, while in the control unit the switch is connected by the first input to the first input of the first OR element and is the control input of the control unit, the second input of the switch is connected to interconnected the output of the pulse generator and the first inputs of the first, second, and third AND elements, the last of which is connected by the output to the first input of the fourth OR element and the second input to the second the course of the first OR element, which is the first input of the control unit, the second and third inputs of which are connected to the third and fourth inputs of the switch connected by the fifth input to the fourth input of the control unit and the first input of the fourth AND element, connected by the output to the third input of the first OR element and the second input to the first output of the register connected by the second input to the fourth input of the first element OR, with the second input of the first element And and with the second input of the second element And connected to the output of the first input an OR element connected to the output with the register input, second and third inputs with the first and second outputs of the switch and with the second input of the fourth OR element, while the second OR element is connected with the first and second inputs with the output of the first AND element and with the third output of the switch, and the outputs of the second and fourth OR elements and the first and second outputs of the switch are the outputs of the control unit. 5. Fox / r 1 FigI