SU1270796A1

SU1270796A1 - Device for magnetic recording and reproducing of digital information

Info

Publication number: SU1270796A1
Application number: SU843814119A
Authority: SU
Inventors: Яков Абрамович Фурман; Анатолий Константинович Передреев
Original assignee: Марийский Ордена Дружбы Народов Политехнический Институт Им.А.М.Горького
Priority date: 1984-11-19
Filing date: 1984-11-19
Publication date: 1986-11-15

Abstract

Изобретение относитс к магнитной записи и позвол ет повысить верность записи-воспроизведени цифровой информации за счет повышени помехоустойчивости к импульст м помехам . Воспроизводимь е сигналы с магнитофона 1 поступают в блоки 5 и 8 формировани сигналов воспроизведени , в которых избирательный усилитель 14 вьщел ет сигнал со средней канальной частотой, а триггер Ымитта 15 формирует серию импульсов, котора через элемент И 16 поступает на блок 17 выделени серии импульсов, сигнал на его выходе формируетс в момент,когда число пришедших импульсов больше заданного. Как только будет зафиксирован первый информационный сигнал, i элемент И 16 запираетс . При по влении синфазных сигналов на выходах (Л блоков 5 и 8 формировани сигналов воспроизведетс сумматор 13 по модулю два через триггер 10 производит останов магнитофона 1. 1 ил. ю об о -а о9 со аThe invention relates to magnetic recording and permits an increase in the fidelity of recording-reproducing digital information by increasing the noise immunity to interference impulses. The reproducing signals from the tape recorder 1 are received in blocks 5 and 8 of the generation of playback signals, in which the selective amplifier 14 selects a signal with a center channel frequency, and the trigger Ymitta 15 forms a series of pulses, which, through the element 16, enters the block 17 of the allocation of a series of pulses, a signal at its output is generated at the moment when the number of arriving pulses is greater than a given one. As soon as the first information signal is recorded, the AND 16 element is locked. When the appearance of common-mode signals at the outputs (L blocks 5 and 8 of the formation of signals, the adder 13 modulo two is played through a trigger 10 causes the tape recorder 1 to stop. 1 Il t. Oo-o9 with a

Description

Изобретение относится к магнитной записи, а именно к устройствам для магнитной записи и воспроизведения цифровой информации.The invention relates to magnetic recording, and in particular to devices for magnetic recording and playback of digital information.

Цель изобретения - повышение верности записи-воспроизведения цифровой информации за счет повышения помехоустойчивости к импульсным помехам.The purpose of the invention is to increase the fidelity of the recording-playback of digital information by increasing the noise immunity to impulse noise.

На чертеже приведена функциональная схема устройства для магнитной записи и воспроизведения цифровой информации.The drawing shows a functional diagram of a device for magnetic recording and playback of digital information.

Устройство для магнитной записи и воспроизведения цифровой информации содержит двухканальный магнитофон 1, подключенный входами через, первый и второй элементы И 2 и 3 к входной шине 4 и первым выходом через первый блок 5 формирования сигналов воспроизведения к выходной шине 6 и к первому входу элемента ИЛИ 7, подсоединенного вторым входом через второй блок 8 формирования сигналов воспроизведения к второму выходу магнитофона 1 и выходом к шине 9 синхронизации, и триггер 10, соединенный первым входом с управляющей шиной 11 и выходом с управляющим входом магнитофона 1.A device for magnetic recording and playback of digital information contains a two-channel tape recorder 1 connected by inputs through the first and second elements And 2 and 3 to the input bus 4 and the first output through the first block 5 of the formation of the playback signals to the output bus 6 and to the first input of the OR element 7 connected to the second input through the second block 8 of the formation of the playback signals to the second output of the tape recorder 1 and the output to the synchronization bus 9, and a trigger 10 connected by the first input to the control bus 11 and the output from the control input tape 1.

Устройство содержит также реле 12 времени и сумматор 13 по модулю два, а каждый блок 5 или 8 формирования сигналов воспроизведения содержит последовательно соединенные избирательный усилитель 14, триггер Шмитта 15, элемент И 16 и блок 17 выделения серии импульсов, и одновибратор 18, причем реле 12 времени подключено входом к управляющей шине 11 и выходом к соединенным между собой управляющем входам первого и второго элементов И 2 и 3 и первого и второго блоков 5 и 8 формирования сигналов воспроизведения, подсоединенных выходами к входам сумматора 13 по модулю два, соединенного выходом с вторым входом триггера 10, при этом •вход избирательного усилителя 14 является входом блока 5 или 8 формирования сигналов воспроизведения, соединенного управляющим входом с одним из входов элемента И 16, подключенного другим из входов через одновибратор 18 к его же выходу, а выход блока 17 выделения серии импульсов является выходом блока 5 или 8 формирова ния сигналов воспроизведения и подключен к входу элемента И 16.The device also contains a time relay 12 and an adder 13 modulo two, and each block 5 or 8 for generating playback signals contains a series-connected selective amplifier 14, a Schmitt trigger 15, an element 16 and a block 17 for selecting a series of pulses, and a one-shot 18, and relay 12 time is connected by an input to the control bus 11 and an output to interconnected control inputs of the first and second elements And 2 and 3 and the first and second blocks 5 and 8 of the formation of the playback signals connected by the outputs to the inputs of the adder 13 module two, connected by the output to the second input of the trigger 10, and • the input of the selective amplifier 14 is the input of the block 5 or 8 generation of playback signals connected by a control input to one of the inputs of the element And 16 connected to the other from the inputs through the one-shot 18 to its output and the output of the pulse series extraction unit 17 is the output of the reproducing signal generation unit 5 or 8 and is connected to the input of the And 16 element.

При поступлении на управляющую ши-: ну 11 сигнала через заданное реле 12 времени включаются первый и второй елементы И 2 и 3. При этом магнитофон 1 находится или в режиме записи, или в режиме воспроизведения. Воспроизводимые сигналы с магнитофона 1 поступают в блоки 5 и 8 формирования сигналов воспроизведения, в которых избирательный усилитель 14 выделяет сигнал со средней канальной частотой, а триггер Шмитта 15 формирует серию импульсов, которая через элемент И 16 поступает на блок 17 выделения серии импульсов. Сигнал на его выходе формируется в момент, когда число пришедших импульсов больше заданного. Сигнал на выходе элемента ИЛИ 7 формируется каждый период в течение всего времени записи. Как только будет зафиксирован первый информационный сигнал, элемент И 16 запирается,При появлении синфазных сигналов на выходах блоков 5 и 8 формирования сигналов воспроизведения сумматор 13 по модулю два через триггер 10 производит останов магнитофона 1, Это позволяет устранить помехи от включения магнитофона 1 и сдвинуть импульсные помехи в нерабочую часть периода информационного сигнала.When a signal is received on the control bus: well, 11 through a predetermined time relay 12, the first and second elements I 2 and 3 are turned on. In this case, the tape recorder 1 is either in recording mode or in playback mode. The reproduced signals from the tape recorder 1 go to blocks 5 and 8 for generating playback signals, in which the selective amplifier 14 extracts the signal with an average channel frequency, and the Schmitt trigger 15 generates a series of pulses, which, through the And 16 element, are transmitted to the pulse series selection block 17. The signal at its output is formed at the moment when the number of incoming pulses is greater than the specified one. The signal at the output of the OR element 7 is formed every period during the entire recording time. As soon as the first information signal is recorded, the And 16 element is locked. When in-phase signals appear at the outputs of the playback signal generation blocks 5 and 8, the adder 13 modulo two stops the tape recorder 1 through the trigger 10, this eliminates the interference from turning on the tape recorder 1 and shift the pulse interference during the non-working part of the information signal period.

Claims

The invention relates to magnetic recording, in particular, to devices for magnetic recording and reproduction of digital information. The purpose of the invention is to improve the fidelity of recording-playing digital information by increasing noise immunity to impulse noise. The drawing shows a functional diagram of a device for magnetic recording and reproduction of digital information. A device for magnetic recording and reproduction of digital information contains a two-channel tape recorder 1 connected by inputs through. the first and second elements 2 and 3 to the input bus 4 and the first output through the first block 5 of generating playback signals to the output bus 6 and to the first input of the element. OR 7 connected by the second input through the second block 8 of generating playback signals to the second output the tape recorder 1 and the output to the synchronization bus 9, and the trigger 10 connected by the first input to the control bus 11 and the output to the control input of the tape recorder 1. The device also includes a time relay 12 and an adder 13 modulo two signals The test unit contains a series-connected selective amplifier 14, Schmitt trigger 15, element 16 and block 17 for selecting a series of pulses, and a one-shot 18, the time relay 12 being connected to the control bus 11 and output to the first and second control inputs connected to each other. The second elements And 2 and 3 and the first and second blocks 5 and 8 of generating playback signals connected by outputs to the inputs of the adder 13 modulo two, connected to the output of the second input of the trigger 10, while the input of the selective amplifier 14 is The input of block 5 or 8 of the formation of playback signals connected by a control input from the inputs of the AND element 16 connected to another of the inputs through the one-shot 18 to its output, and the output of the pulse series generator 17 is the output of the block 5 or 8 playback signals and podytyuchen to the input element And 16. When entering the control bus-; Well, 11 signals through the predetermined time relay 12 turn on the first and second elements of AND 2 and 3. In this case, the tape recorder 1 is either in pexif e recording or in playback mode. The reproduced signals from the tape recorder 1 are received in blocks 5 and 8 of the generation of playback signals, in which the selective amplifier 14 selects a signal with a center channel frequency, and the Schmitt trigger 15 forms a series of pulses, which through element 16 enters the block 17 of the series of pulses. The signal at its output is formed at the moment when the number of incoming pulses is greater than the specified one. A signal at the output of the element OR 7 is formed every period during the entire recording time. As soon as the first information signal is fixed, the AND 16 element will go down. If common mode signals appear at the outputs of the playback signal generating units 5 and 8, modulo 13 modulo two will stop the tape recorder 1 through trigger 10. This eliminates interference from switching on the tape recorder 1 and shift the impulse noise in the non-operational part of the period of the information signal. The invention of the device is a DD1I magnetic recording and playback of digital information containing a two-channel tape recorder connected by inputs through the first and second elements I to the input bus and the first output through the first playback signal generation unit to the output bus and to the first input of the OR element connected by the second input through a second reproduction signal shaping unit to the second mapheadphone output and an output. 71, ohm to the sync bus, and a trigger connected to the first input to the control bus and the output to the control input of the tape recorder, characterized in that, in order to improve the accuracy of the digital information recording / reproduction by increasing the noise immunity to impulse noise, a time relay and a modulo-two adder, and each playback signal generating unit contains successively connected selective amplifier, Schmitt trigger, element And and a series of pulses, and one new one, with the relay The input is connected to the control bus and the output to the interconnected control inputs of the first and second elements And the first and second playback signal generating units, connected outputs to the inputs of the modulo two, connected to the second input of the trigger, while the input and the bi-ampal amplifier is an input of a reproduction signal shaping unit connected by a control input to one of the inputs of an And element connected to another of the inputs through a one-shot to its output, and One of the pulse train selection unit is the output of the playback signal generating unit and connected to the input of the element I.