SU723657A1

SU723657A1 - Device for reproducing signals from magnetic carrier

Info

Publication number: SU723657A1
Application number: SU782647849A
Authority: SU
Inventors: Гедиминас-Повилас Повилович Вейверис
Original assignee: Институт Математики И Кибернетики
Priority date: 1978-07-24
Filing date: 1978-07-24
Publication date: 1980-03-25

Description

Изобретение относится к приборостроению и может быть использовано в запоминающих устройствах вычислительных машин на магнитных лентах, дисках и барабанах в процессе воспроизведения ранее записанных сигналов.The invention relates to instrumentation and can be used in the storage devices of computers on magnetic tapes, disks and drums in the process of reproducing previously recorded signals.

В современных запоминающих устройствах ⁵широко используются способы относительной фазовой магнитной записи.In modern storage devices ⁵ , methods of relative phase magnetic recording are widely used.

Известно устройство для воспроизведения информации с магнитного носителя, которое позволяет выделять синхроимпульсы при помощи одновибратора, но не позволяет восстанавливать синхроимпульсы при выпадении сигналов, которые имеют место при дефектах магнитного носителя, что приводит к снижению помехоустойчивости. Кроме того, эти устройства не могут быть использованы при воспроизведении информации, записанной методом УФМГ1 [1].A device for reproducing information from a magnetic medium, which allows you to select the clock using a single vibrator, but does not allow you to restore the clock when the signals that occur with defects in the magnetic media, which reduces the noise immunity. In addition, these devices cannot be used when reproducing information recorded using the UFMG1 method [1].

Наиболее близким по технической сущности является устройство для воспроизведения сигналов с магнитного носителя, содержащее нуль-орган, соединенный, с одним входом схемы И, моновибратор, две линии задержки, входную шину и выходные шины кодовых и синхронизирующих импульсов [2].The closest in technical essence is a device for reproducing signals from a magnetic medium, containing a zero-organ connected to one input of the And circuit, a monovibrator, two delay lines, an input bus and output buses of code and clock pulses [2].

Недостатком устройства является низкая помехоустойчивость, обусловленная потерями синхроимпульсов при выпадении сигналов в местах дефектов магнитного носителя. Кроме того, обратная связь, введенная в устройство, не обеспечивает требуемой точности корректировки периода следования синхроимпульсов.The disadvantage of this device is the low noise immunity due to the loss of clock pulses during the loss of signals in places of defects in the magnetic carrier. In addition, the feedback introduced into the device does not provide the required accuracy of the adjustment of the repetition period of the clock pulses.

Цель изобретения - повышение помехоустойчивости устройства.The purpose of the invention is to increase the noise immunity of the device.

Цель достигается тем, что в устройство введены два временных дискриминатора, три формирователя импульсов и управляемый моновибратор, выход которого соединен через схему И с выходной шиной кодовых импульсов и одним входом первого временного дискриминатора и с выходной шиной синхронизирующих импульсов через первый формирователь импульсов и первую линию задержки, выход моновибратора подключен к второй линии задержки через второй формирователь импульсов, а ко вторым входам временных дискриминаторов - через третий формирова тель импульсов, выход второй линии задержки соединен с входом моновибратора, с запускающим входом управляемого моновибратора и первым входом второго временного дискриминатора, выход которого соединен с управляющим входом управляемого моновибратора, другой управляющий вход которого соединен с выходом первого временного дискриминатора.The goal is achieved by the fact that two time discriminators, three pulse shapers and a controlled monovibrator are introduced into the device, the output of which is connected via an AND circuit to the output code pulse bus and one input of the first temporary discriminator and to the output synchronizing pulse bus through the first pulse shaper and the first delay line , the monovibrator output is connected to the second delay line through the second pulse shaper, and to the second inputs of temporary discriminators through the third pulse shaper to yield a second delay line connected to the input monovibratora, with the trigger input managed monovibratora and the first input of the second time discriminator whose output is connected to a control input managed monovibratora, another control input coupled to an output of the first discriminator temporary.

На фиг. 1 приведена блок-схема устройства; на фиг. .2 - временные диаграммы рабо- ¹⁰ты.In FIG. 1 shows a block diagram of a device; in FIG. .2 - time diagrams of work ¹⁰ .

Устройство для воспроизведения сигналов с магнитного носителя содержит последовательно соединенные нуль-орган 1, моновибратор 2, второй формирователь 3 импульсов и '5 линию 4 задержки, причем выход моновибратора 2 сое/хинен с первыми входами второго и первого временных дискриминаторов 5 и 6 через третий формирователь 7 импульсов, а выход линии 4 задержки соединен с входом 20 моновибратора 2, с вторым входом временного дискриминатора 5 и с запускающим входом управляемого моновибратора 8. Выходы второго и первого временных дискриминаторов 5 и 6 подключены к управляющим входам управ- 75 ляемого моновибратора 8, выход которого соединен с выходной шиной синхронизирующих импульсов 9 через первый формирователь 10 импульсов и первую линию 11 задержки и с выходной шиной 12 кодовых импульсов - че- ³⁰рез схему 13 И. Другой вход схемы 13 И подключен к выходу нуль-органа 1, а выходная шина 12 кодовых импульсов подключена к второму входу временного дискриминатора 6. Входная шина 14 соединена с входом нуль-органа 1. ³⁵Устройство работает следующим образом. Срабатывая от нулевого уровня сигнала, поступающего через входную шину 14 устройства (эпюра 1, фиг. 2), нуль-орган 1 вырабатывает импульсы (эпюра 2, фиг.2), которые по- ⁴⁰ступают на вход моновибратора 2 и один вход схемы 13 И. Первый импульс, выработанный нуль-органом 1 в начале такта, запускает моновибратор 2, длительность импульса которого равна 3/4 тактового периода (эпюра 3, фиг.2). 45 Второй формирователь 3 формирует импульс из заднего фронта импульса моновибратора 2 (эпюра 4, фиг.2), который поступает на вход второй линии 4 задержки. Время задержки второй линии 4 задержки равно 1/4 тактового 50 периода. Импульсы с выхода второй линии 4 задержки (эпюра 5, фиг.2) поступают на вход моновибратора 2 и запускают его в случае отсутствия импульсов на выходе· нуль-органа 1 в начале такта. Кроме того, эти импульсы за- 55 пускают управляемый моновибратор 8, длительность импульса которого равна 3/4 такто вого периода и регулируется в зависимости от временного рассогласования второго и первого временных дискриминаторов 5 и 6. Второй временной дискриминатор 5 работает, когда нуль-орган 1 выделяет импульсы в начале периода, а первый временной дискриминатор 6 работает, когда нуль-орган 1 выделяет импульсы в середине тактового периода. Импульсы с выхода управляемого моновибратора 8 (эпюра 6, фиг.2) открывают схему 13 И и на выходную шину 12 кодовых импульсов проходят кодовые импульсы единиц (эпюра 7, фиг.2). Первый формирователь 10 импульсов формирует импульсы из переднего фронта импульса управляемого моновибратора 8 (эпюра 8, фиг.2), которые задерживаются первой линией 11 задержки и поступают на выходную шину 9 синхронизирующих импульсоЬ (эпюра 9, фиг.2).A device for reproducing signals from a magnetic medium comprises a series-connected zero-organ 1, a monovibrator 2, a second pulse shaper 3 and a '5 delay line 4, the output of a soy / hinen monovibrator 2 with the first inputs of the second and first temporary discriminators 5 and 6 through the third shaper 7 pulses, and the output of the delay line 4 is connected to the input 20 of the monovibrator 2, to the second input of the temporary discriminator 5 and to the triggering input of the controlled monovibrator 8. The outputs of the second and first temporary discriminators 5 and 6 are Keys to the control inputs 75, pull a controlled monovibratora 8, the output of which is connected to the output line clock pulse shaper 9 via the first 10 pulses and the first delay line 11 and output line 12 of the code pulses - ³⁰ che Res circuit 13 I. Another input circuit 13 And it is connected to the output of the zero-organ 1, and the output bus 12 of the code pulses is connected to the second input of the temporary discriminator 6. The input bus 14 is connected to the input of the zero-organ 1. ³⁵ The device operates as follows. Actuating the zero level signal supplied through the input bus 14 devices (curve 1, Fig. 2), the zero-body 1 generates pulses (curve 2, Figure 2) which po- tread ⁴⁰ to the input monovibratora 2 and one input circuit 13 I. The first pulse generated by the zero-organ 1 at the beginning of the clock starts a monovibrator 2, the pulse duration of which is equal to 3/4 of the clock period (plot 3, figure 2). 45 The second driver 3 generates a pulse from the trailing edge of the pulse of the monovibrator 2 (plot 4, figure 2), which is fed to the input of the second delay line 4. The delay time of the second delay line 4 is 1/4 of a clock period 50. The pulses from the output of the second delay line 4 (plot 5, figure 2) are fed to the input of the monovibrator 2 and start it if there are no pulses at the output of the · zero-organ 1 at the beginning of the beat. In addition, these pulses start a controlled monovibrator 8, the pulse duration of which is 3/4 of the clock period and is regulated depending on the temporal mismatch of the second and first time discriminators 5 and 6. The second time discriminator 5 works when the zero-organ 1 emits pulses at the beginning of the period, and the first time discriminator 6 works when the zero-organ 1 emits pulses in the middle of the clock period. The pulses from the output of the controlled monovibrator 8 (plot 6, figure 2) open the circuit 13 And and on the output bus 12 code pulses pass code pulses units (plot 7, figure 2). The first pulse shaper 10 generates pulses from the leading edge of the pulse of the controlled mono-vibrator 8 (plot 8, FIG. 2), which are delayed by the first delay line 11 and arrive at the output bus 9 of the synchronizing pulses (plot 9, FIG. 2).

Claims

The invention relates to instrument making and can be used in memory devices of computed hatch machines on magnetic tapes, discs and drums during the playback of previously recorded signals. In modern memory devices, relative phase magnetic recording methods are widely used. A device for reproducing information from a magnetic carrier is known, which makes it possible to isolate the clock pulses with the help of a single vibrator, but does not allow for recovering the clock pulses when signals fall out that occur with defects of the magnetic carrier, which leads to a decrease in noise immunity. In addition, these devices cannot be used when reproducing information recorded by the UFMP method 1. The closest in technical essence is a device for reproducing signals from a magnetic carrier. containing a null-organ connected to one input of the AND circuits, monovibrator, two delay lines, input bus and output buses of code and clock pulses 2. The device’s drawback is low noise immunity due to loss of sync pulses when signals are dropped in places of magnetic carrier defects . In addition, the feedback entered into the device does not provide the required accuracy of the correction of the period of the following clock pulses. The purpose of the invention is to improve the noise immunity of the device. The goal is achieved by introducing two time discriminators into the device, three pulse drivers and a controlled monovibrator, the output of which is connected through the AND circuit to the output bus of code pulses and one input of the first time discriminator and the output bus of synchronizing pulses through the first pulse shaper and the first line delays, the output of the monovibrator is connected to the second delay line through the second pulse shaper, and to the second inputs of the time discriminators - via the third pulse shaper In other words, the output of the second delay line is connected to the input of the mono-vibrator, with the trigger input of the controlled mono-vibrator and the first input of the second time discriminator, the output of which is connected to the control input of the controlled mono-vibrator, the other control input of which is connected to the output of the first time discriminator. FIG. 1 shows a block diagram of the device; in fig. 2 - time diagrams of work. A device for reproducing signals from a magnetic carrier contains a serially connected null organ 1, a monovibrator 2, a second driver 3 pulses and a delay line 4, and the output of the monovibrator 2 is connected to the first inputs of the second and first time discriminators 5 and 6 through a third driver 7 pulses, and the output of the delay line 4 is connected to the input of the monovibrator 2, with the second input of the temporary discriminator 5 and with the triggering input of the controlled monovibrator 8. The outputs of the second and first time discriminators 5 and 6 are Connected to the control inputs of the controlled monovibrator 8, the output of which is connected to the output clock of the clock pulses 9 through the first driver 10 pulses and the first delay line 11 and 12 output pulses of code pulses through the circuit 13 I. The other input of the circuit 3 And is connected to the output the zero-organ 1, and the output bus 12 of the code pulses are connected to the second input of the temporary discriminator 6. Input 14 is connected to the input of the zero-organ 1 The device operates as follows. Triggered from the zero level of the signal coming through the input device 14 of the device (plot 1, fig. 2), the null organ 1 generates pulses (plot 2, fig 2), which feed into the input of the monovibrator 2 and one input of the circuit 13 I. The first impulse produced by the null-organ 1 at the beginning of the clock triggers the monovibrator 2, the pulse duration of which is equal to 3/4 clock period (plot 3, figure 2). The second driver 3 generates a pulse from the back edge of the pulse of the monovibrator 2 (plot 4, fig. 2), which is fed to the input of the second line 4 delay. The delay time of the second line 4 delay is 1/4 of the clock period. The pulses from the output of the second line 4 delay (plot 5, figure 2) are fed to the input of the monovibrator 2 and start it in the absence of pulses at the output: the zero-body at the beginning of the stroke. In addition, these pulses trigger a controlled monovibrator 8, the pulse duration of which is equal to 3/4 of the clock period and is adjusted depending on the time difference of the second and the first time discriminators 5 and 6. The second time discriminator 5 operates when the null organ I emits pulses at the beginning of the period, and the first time discriminator 6 operates when the null organ 1 emits pulses in the middle of a clock period. The pulses from the output of the controlled monovibrator 8 (plot 6, Fig. 2) open the circuit 13A and code impulses of the units pass through the output bus 12 of code pulses (plot 7, Fig. 2). The first pulse shaper 10 generates pulses from the leading edge of the pulse of the controlled monovibrator 8 (plot 8, figure 2), which are delayed by the first delay line 11 and arrive at the output bus 9 of synchronizing pulses (plot 9, figure 2). Claims An apparatus for reproducing signals from a magnetic carrier, comprising a null organ connected to one input of an AND circuit, a mono-vibrator, two delay lines, input and output buses of code and sync pulses, differs in that two noise discriminators, three pulse drivers and a controlled monovibrator, the output of which is connected through an AND circuit to the output bus of code pulses and one input of the first time discriminator and to the output bus clock pulses through the first pulse shaper and the first delay line, the monovibrator output is connected to the second delay line through the second pulse shaper, and to the second inputs of the time discriminators through the third pulse shaper, the output of the second delay line is connected to the monitored input of the controlled input monovibrator and the first input of the second temporary discriminator, the output of which is connected to the control input of the controlled monovibrator, another control input to torogo connected to the output of the first discriminator temporary. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 296144, cl. From 11 to 5/02, 1969.

2. USSR author's certificate number 546009, cl. G 11 B 5/09, 1975 (prototype). I about I about I about I I About I 1 I 1 I 1 I 0. 1 0 I 1 I 0 I 0 I I