SU1150654A1 - Device for searching information on magnetic medium - Google Patents

Abstract

1. A DEVICE FOR GOISK OF INFORMATION ON A MAGNETIC MEDIA containing a magnetic playback head, an input keyboard, a memory unit whose input is connected to the output of the input keyboard, and an output to the first input of the comparison unit, the control unit whose first and second inputs are connected to the first and the second outputs of the comparison unit, respectively, the registration unit, the input of which is connected to the output of the memory unit, and the execution elements, characterized in that, in order to increase the search accuracy by encoding the phonograms, Code comparator, sync pulse comparator, gating pulse shaper, low pass filter, phonogram end shaper, information storage register and code converter, the first input of which is connected to the output of the sync pulse comparator and the input of the gating pulse generator, and the second input connected to the comparator output code, the third input of the code converter is connected to the third step of the comparison unit, and the output is connected to the first input of the information storage register, the second input which is connected to the first output of the gating pulse shaper, the output of the information storage register is connected to the second input of the comparator, the second output of the gating pulse shaper is connected to the first inputs of the code comparator and the comparator of synchronizing pulses, respectively, the second inputs of which are connected to the magnetic (L playback head, filter input the low frequency is the device input, the output of this filter is connected to the input of the phonogram end generator, the output of which is connected pervm input of the first actuator, third and Chethel VERT outputs strobe shaper of: rukitsih pulses are connected to respective inputs of the control unit, fifth input of which is connected to a third output sd comparing unit. the first and second outputs of the control unit are connected to the first inputs, and the third and fourth outputs to the second inputs of the second and third actuators, the fifth output of the control unit is connected to the second input of the first actuator. 2. The device according to claim 1, which is based on the fact that the gating pulse driver contains a counter, an inverter and four

Description

the one-shot, the output of the first one-shot is connected to the inputs of the second and third one-shot, respectively, as well as to the input of the inverter and is the first output of the former, the input of the first one-oscillator is connected to the output of the counter, the first input of which is the former of the counter, and the output of the inverter, the output of the second and the first output of the third one-shot are the second and third outputs of the driver, the second output of the third one-shot is connected to the input of the fourth one-shot, output d which is the output of the fourth.

The invention relates to instrumentation and can be used in the technique of magnetic recording.

A device for digital magnetic recording is known, comprising a synchronizer, a mutually shifted series driver connected to it, a signal converting unit, a shift register, a recording amplifier, and a switch of a shifted series SP.

The closest to the proposed technical essence and the achieved result is a device for searching information on magnetic media, which contains a magnetic playback head that is connected to the input of a pulse counter, an input keyboard, a memory whose input is connected to an input keyboard, and an output with the first the input of the comparison unit, the second input of which is connected to the output of the counter, the outputs of the counter and memory are connected to the inputs of the first and second registration units, the control unit, the inputs of which are connected to moves comparing unit, keyboard input and actuators, and vpsody - to the inputs of the pulse counter and one memory C2.

The disadvantages of the known device are low functional reliability and low search speed of phonograms.

The purpose of the invention is to increase the accuracy of information retrieval.

This goal is achieved by the fact that in a device for searching information on magnetic media, comprising a magnetic reproduction head, an input keyboard, a memory unit, the input of which is connected to the output

input keypads, and the output - with the first input of the comparison unit, the control unit, the first and second inputs of which are connected to the first and second outputs of the comparison unit, respectively, the register unit, whose input is connected to the output of the memory unit, and the executive elements, a code comparator, synchronizing pulse comparator, gate pulse shaper, low pass filter, phonogram end shaper, information storage register and code converter, the first input of which is connected to the output of a synchronizer comparator pulse and with the gate driver input, and the second input is connected to the code comparator output, the third input of the code converter is connected to the third output of the comparison unit, and the output to the first input of the information storage register, the second input of which

connected to the first output of the gating pulse generator, the output of the information storage register is connected to the second input of the comparator unit, the second output of the gating pulse generator is connected to the first inputs of the code comparator and the comparator of synchronizing pulses, the second inputs of which are connected to the magnetic playback head, the input of the low-pass filter is the device input, the output of this filter is connected to the input of the phonogram end generator, the output of which is connected to the first input

first actuator, 1t retiy and fourth outputs forma-

3

The gate of the strobe pulses is connected to the corresponding inputs of the uprapey unit, the fifth input of which is connected to the third output of the comparison unit, the first and second outputs of the control unit are connected to the first inputs, and the third and fourth outputs to the second inputs of the second and third final elements, the fifth output the control unit is connected to the second input of the first actuator.

The gating pulse shaper contains a counter, an inverter and four one-shot, the output of the first one-shot is connected to the inputs of the second and. The third one, respectively, as well as with the input of the inverter, is the first output of the former, the input of the first one-oscillator is connected to the output of the counter, the first input of which is the input of the former, and the second input of the counter is connected to the output of the inverter, the output of the second and the first output of the third one-oscillator is The second and third outputs of the former, the second output of the third single vibrator is connected to the input of the fourth single vibrator, the output of which is the fourth output of the former.

Figure 1 shows the functional diagram of the proposed device in figure 2 - timing diagrams explaining its operation j in FIG. 3 is the functional diagram of the gate pulse generator j - time diagrams showing its operation; FIG. 3 shows timing diagrams of phonogram formation.

The device for searching information on magnetic media (Fig. 1) contains a magnetic playback head 1, an input keyboard 2, a memory block 3, the input of which is connected to the input keyboard 2, and an output to the first input of the comparison unit 4, control unit 5, a registration unit 6, for example, a display, whose input is connected to the output of memory unit 3, a code converter 7, a code generator 8, a clock comparator 9, a gate generator 10, a storage register 11, actuators 12-14, vertical506544

For example, in the form of pulsed magnets, a low-pass filter 15, a phonogram end shaper 16, and the lower filter input 15 is often (5 is the device input, AND-NOT elements 17 and 18, 2-NOT element 19, ZI-NE element 20, counter 21, inverter 22, one-shot 23-26. The device works as follows

0 way.

From the input keypad 2 (Fig. 1), information, which is the code of the phonogram to be searched, enters into the memory block 3 (Fig. 2i,

5 k, f), from the output of memory block 3, this information in the form of a parallel binary code is fed to comparison block 4 and compared with the phonogram number code, which is in the information storage register 11 received from the magnetic playback head 1 (Fig. 2m, and about).

As a result of the comparison, one of the commands is generated: the command

5 when the information code from the output of memory block 3 is larger than the information code. From the output of the storage register 11, the command c when the information code is smaller than the information code from the output

. register 11 storage and command with equal codes.

If, for example, a command is aborted, it arrives at the control unit 5 of the control elements 12-14, where the control pulses are generated. When a command is given, a pulse enters the magnet 12 Fast forward, turns it on, puts the tape recorder into rewind mode, switches on the tape recorder and the tape with the phonogram moves along the magnetic playback head 1, the phonogram number code signals and the phonogram itself are recorded on different tracks (Fig. 5 ), the search mode begins. In the Search mode, when the actuator is triggered, the magnetic tape is retracted from the magnetic head 1 to provide the necessary clearance for reading the phonogram code.

The codes recorded on the tape are read by the magnetic head 1 (Fig. 2a), the input to the comparator 8 of the code and the comparator 9 of synchronizing pulses is a signal that contains only the phonogram number code

we (Fig.26). The synchronizing pulse comparator 9 generates sync pulses at the output (Fig. 25). From another track, on which a sound track is recorded, which is processed in the amplifier of reproduction of the tape recorder, a signal is fed to the input of the low-pass filter 15 (Fig, 5).

The phonogram code is fed to the input of the 7 code converter, where it is converted into a parallel binary code. The conversion of the phonogram number code when searching forwards or backwards is performed by the converter of 7 codes according to the signal of the Rewind command coming from block 4 of the comparison.

The synchronization pulses are supplied to the code converter 7 for synchronization and simultaneously to the gate pulse TO driver, which absorbs the following pulses: the recording pulse to the information storage register 11 after passing through the entire code sequence, the passing sound track code entering the information storage register 11, the code from the outputs of the register 11 enters the comparison unit 4 (FIG. 2 w, n, o); a pulse strobe comparators 8 and 9 for the duration of the operation of the actuators 12-14, in order to eliminate interference in the amplification path; impulse, strutting the actuator control unit 5, to receive a magnet reset pulse (fig. 2 o) -, impulse, strobe control unit 5 to obtain a start pulse of one of the actuator elements (fig.2 p).

When the information codes received from the keyboard 2 of the input match and the information code received from the magnetic tape coincide, the comparison unit 4 fails the equality pulse (Fig. 29), which is fed to the control unit 5. The control unit 5 generates a reset pulse, for example, a magnet 12 Fast forward (Fig. 2p) and a start pulse, on 506546

for example, magnet 14 Working stroke (Fig. 2c), the tape recorder switches to the playback mode of the second phonogram,

5 To perform a software search, you need to connect a computer interface instead of a keyboard. At the end of the phono. grams from the linear output of the tape recorder receives the pulse of the end of a phonogram, which was recorded together with the phonogram signal (Fig. 5) and is a low-frequency signal with a duration of about 1.0 s,

15, which is separated from the phonogram by the low-pass filter 15, and is fed to the phonogram end generator 16, which forms a reset pulse for the actuator.

20 Shaper pulse generator 10 generates pulses controlling the main functional units of the device (FIG. 3). The counter 21 of the imaging unit 10 strobuyu25 strokes intended

for counting clock pulses (Fig. 4a). After counting, the counter 21 at the output selects a pulse (FIG. 45), from which a single vibrator 23 (FIG. 3)

30 forms a short positive strobe pulse (FIG. 4) for recording the phonogram code in the device information storage register 11 (FIG. 1), one temporarily this gate pulse is sent to the one-shot 24 (figure-3), the one-shot 25 and the inverter 22 .

All listed gating

jj pulses are generated each time the phonogram codes are read from a magnetic tape.

The proposed device has a high accuracy of information retrieval by encoding phonograms to be searched. Using it allows you to quickly otyukan necessary phonogram, and in case of failure (skip phonogram) there is no need to return to the beginning of the tape.

-Vy VVWVV

a 9 I I 9 f Ж

f n

H

6

J

e

t 9 F

fpus.j

Fi9,2

Claims (2)

1. A DEVICE FOR SEARCHING INFORMATION ON A MAGNETIC MEDIA, containing a magnetic playback head, an input keyboard, a memory unit, the input of which is connected to the output of the input keyboard, and the output - with the first input of the comparison unit, a control unit, the first and second inputs of which are connected to the first and the second outputs of the comparison unit, respectively, the registration unit, the input of which is connected to the output of the memory unit, and actuators, characterized in that, in order to improve the accuracy of the search due to the encoding of phonograms, a computer code generator, clock comparator, gate pulse generator, low pass filter, phonogram end generator, information storage register and code converter, the first input of which is connected to the output of the synchronization pulse comparator and the input of the gate pulse generator, and the second input is connected to the output of the code comparator , the third input of the code converter is connected to the third output of the comparison unit, and the output is connected to the first input of the information storage register, the second input of which is connected nen with the first output of the gate pulse generator, the output of the information storage register is connected to the second input of the comparison unit, the second output of the gate pulse generator is connected to the first inputs of the code comparator and the synchronization pulse comparator, respectively, the second inputs of which are connected to the magnetic playback head, the low-pass filter input is the input of the device, the output of this filter is connected to the input of the former of the end of the phonogram, the output of which is connected to the first input of the first of the additional element, the third and fourth outputs of the gate pulse generator are connected to the corresponding inputs of the control unit, the fifth input of which is connected to the third output of the comparison unit, the first and second outputs of the control unit are connected to the first inputs, and the third and fourth outputs to the second inputs of the second and third executive elements, the fifth output of the control unit is connected to the second input of the first actuating element. 2. The device according to claim 1, wherein the gate pulse generator comprises a counter, an inverter, and four SU „„ 1150654 one-shot, the output of the first one-shot is connected to the inputs of the second and third one-shots, respectively, and also to the inverter input and is the first output of the driver, the input of the first one-shot is connected to the output of the counter, the first input of which is the input of the driver, and the second input of the meter is connected to the inverter output, the output of the second and first output of the third one-shots are the second and third outputs of the driver, the second output of the third one · vibrator is connected to the input of the fourth · one-shot Whose output is the output of the fourth. f