JPS57162040A - Data checking system - Google Patents

Data checking system

Info

Publication number
JPS57162040A
JPS57162040A JP56047530A JP4753081A JPS57162040A JP S57162040 A JPS57162040 A JP S57162040A JP 56047530 A JP56047530 A JP 56047530A JP 4753081 A JP4753081 A JP 4753081A JP S57162040 A JPS57162040 A JP S57162040A
Authority
JP
Japan
Prior art keywords
data
cyclic code
continuation mode
continuation
gate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP56047530A
Other languages
Japanese (ja)
Other versions
JPS619649B2 (en
Inventor
Kikuo Hatasawa
Toshiki Morita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Software Engineering Co Ltd
Hitachi Ltd
Original Assignee
Hitachi Software Engineering Co Ltd
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Software Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Software Engineering Co Ltd
Priority to JP56047530A priority Critical patent/JPS57162040A/en
Publication of JPS57162040A publication Critical patent/JPS57162040A/en
Publication of JPS619649B2 publication Critical patent/JPS619649B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
    • H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
    • H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
    • H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit

Abstract

PURPOSE:To prevent display of an error frame, by accumulating a generation cyclic code of each data unit, obtaining a cyclic code of a data string having prescribed length, and checking the data string by use of its cyclic code. CONSTITUTION:A continuation/non-continuation mode indicating FF11 is set or reset by a continuation mode of a non-continuation mode indicated by a command signal in advance. Also, a series data read out from a magnetic disk, etc. is provided to an AND gate 13 by a clock synchronizing with the data, its series data is inputted to a cyclic code generating circuit 10 through the gate 13, is subtracted by a generating polynomial in accordance with a data lock enable signal, and its division is executed until the final data in the sector. Subsequently, immediately before the next first data is obtained, a cyclic code of a data string having prescribed length is obtained by referring to a state of the FF11 by the circuit 10, and after read-out of the indicated data has been completed, and cyclic code is outputted, and display of an error frame is prevented.
JP56047530A 1981-03-31 1981-03-31 Data checking system Granted JPS57162040A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56047530A JPS57162040A (en) 1981-03-31 1981-03-31 Data checking system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56047530A JPS57162040A (en) 1981-03-31 1981-03-31 Data checking system

Publications (2)

Publication Number Publication Date
JPS57162040A true JPS57162040A (en) 1982-10-05
JPS619649B2 JPS619649B2 (en) 1986-03-25

Family

ID=12777671

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56047530A Granted JPS57162040A (en) 1981-03-31 1981-03-31 Data checking system

Country Status (1)

Country Link
JP (1) JPS57162040A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10873441B2 (en) * 2019-03-29 2020-12-22 Teledyne E2V Semiconductors Sas Method for synchronizing digital data sent in series

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10873441B2 (en) * 2019-03-29 2020-12-22 Teledyne E2V Semiconductors Sas Method for synchronizing digital data sent in series

Also Published As

Publication number Publication date
JPS619649B2 (en) 1986-03-25

Similar Documents

Publication Publication Date Title
JPS5380105A (en) Digital signal transmission method
JPS5744272A (en) Electronic editing method
JPS55124343A (en) Clock signal extracting system
GB1242520A (en) Photoelectric read-out apparatus
JPS57162040A (en) Data checking system
JPS5628868A (en) Form slide displacement accomodation device in light beam recording device
JPS56165989A (en) Memory patrol system
JPS545416A (en) Data check system by crc
JPS5236012A (en) Recording and playback device
JPS5584008A (en) Recorder/reproducer of digital signal
JPS53110433A (en) Memory unit
JPS5313477A (en) Operating time measuring system for mechanism
JPS5262416A (en) Recording reproducer check method
JPS53100216A (en) Magnetic tape memory device
JPS53122340A (en) Check system for read-in data
JPS5320909A (en) Magnetic recorder/reproducer
JPS537133A (en) Information reproducer
JPS5370415A (en) Synchronizing circuit for magnetic memory
JPS5373126A (en) Recording information reading system of magnetic tape apparatus
JPS533022A (en) Information reading system
JPS53142210A (en) Pcm recorder/reproducer
JPS54118814A (en) Sector clock check system in rotary magnetic memory device
JPS57103115A (en) Control circuit of magnetic recorder and reproducer
JPS5552571A (en) Recording and reproducing system for address information signal
JPS5277641A (en) Sub system of magnetic disc unit