SU853656A1 - Method of digital data recording and reproduction - Google Patents
Method of digital data recording and reproduction Download PDFInfo
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- SU853656A1 SU853656A1 SU772526119A SU2526119A SU853656A1 SU 853656 A1 SU853656 A1 SU 853656A1 SU 772526119 A SU772526119 A SU 772526119A SU 2526119 A SU2526119 A SU 2526119A SU 853656 A1 SU853656 A1 SU 853656A1
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Description
(54) СПОСОБ ЗАПИСИ-ВОСПРОИЗВЕДЕНПЯ ЦИФРОВОЙ ИНФОРМАЦИИ(54) RECORDING METHOD - REPRODUCING DIGITAL INFORMATION
II
Изобретение относитс к области приборостроени и может быть использовано при построении цифровы.х накопителей на движущихс магнитны.х носител х.The invention relates to the field of instrumentation and can be used in the construction of digital storage devices on moving magnetic media.
Известен способ записи цифровой информации с самосинхронизацией, по которому значение двоичной единицы определ етс либо направлением перемагничивани носител в конце такта, либо рассто нием между двум перемагничивани ми 1.A known method of recording digital information with self-synchronization, according to which the value of a binary unit is determined either by the direction of magnetic reversal of the carrier at the end of a clock or by the distance between two magnetization reversal 1.
Однако при записи информации в виде отдельных групп помехозащищенность оказываетс недостаточной по той причине, что обнаружение воспроизводимого сигнала производитс по его амплитуде. Поэтому наличие шума в йаузах между группами и паразитной амплитудной модул ции сигнала приводит к ложным обнаружени м и пропускам сигнала.However, when recording information in the form of separate groups, the noise immunity is insufficient for the reason that the detection of the reproduced signal is performed according to its amplitude. Therefore, the presence of noise in the yauses between the groups and spurious amplitude modulation of the signal leads to false detections and skips of the signal.
Наиболее близким по технической сущности вл етс способ записи-воспроизведени цифровой информации с самосинхронизацией , методом фазовой модул ции 2.The closest in technical essence is a method of recording-reproducing digital information with self-synchronization, the phase modulation method 2.
Однако достоверность воспроизводимой информации невелика.However, the reliability of the reproduced information is low.
Целью изобретени вл етс повышение помехоустойчивости устройства.The aim of the invention is to improve the noise immunity of the device.
Цель достигаетс тем. что в паузах между кодовыми группами записывают сигнал с частотой меньшей в два раза тактовой частоты записи информации, а при воспроизведемте начало и конец кодовых групп определ ют по изменени м частоты сигнала воспроизведени .The goal is achieved by those. that in the intervals between code groups the signal is recorded with a frequency of less than two times the clock frequency of recording information, and when playing, the beginning and end of the code groups are determined from changes in the frequency of the playback signal.
На фиг. 1 приведена блок-схема устройства записи по предлагаемому способу; на фиг. 2 - блок-схема устройства воспроиз .- ведени ; на фиг. 3 - временные диаграммы, по сн ющие предлагае.мый способ.FIG. 1 shows a block diagram of a recording device according to the proposed method; in fig. 2 is a block diagram of a reproducing apparatus; in fig. 3 - timing charts, explaining the proposed method.
Устройство дл записи цифрового сигнала по предлагаемо1му способу (см. фиг. 1) содержит входную информационную шину 1, 5 подключенную через схему ИЛИ 2 и блок записи 3 к головке записи 4, схему .5 определени паузы между кодовыми группами, с.хему И 6-и генератор 7 эталонных импульсов .A device for recording a digital signal according to the proposed method (see FIG. 1) contains an input data bus 1, 5 connected via the OR 2 circuit and a recording unit 3 to the recording head 4, the .5 scheme for determining the pause between code groups, And 6 -and generator 7 reference pulses.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772526119A SU853656A1 (en) | 1977-09-12 | 1977-09-12 | Method of digital data recording and reproduction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU772526119A SU853656A1 (en) | 1977-09-12 | 1977-09-12 | Method of digital data recording and reproduction |
Publications (1)
Publication Number | Publication Date |
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SU853656A1 true SU853656A1 (en) | 1981-08-07 |
Family
ID=20725584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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SU772526119A SU853656A1 (en) | 1977-09-12 | 1977-09-12 | Method of digital data recording and reproduction |
Country Status (1)
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SU (1) | SU853656A1 (en) |
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1977
- 1977-09-12 SU SU772526119A patent/SU853656A1/en active
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