JPS5450306A - Block error detection of magnetic tape - Google Patents

Block error detection of magnetic tape

Info

Publication number
JPS5450306A
JPS5450306A JP11550377A JP11550377A JPS5450306A JP S5450306 A JPS5450306 A JP S5450306A JP 11550377 A JP11550377 A JP 11550377A JP 11550377 A JP11550377 A JP 11550377A JP S5450306 A JPS5450306 A JP S5450306A
Authority
JP
Japan
Prior art keywords
block
magnetic tape
signals
fed
leading end
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.)
Pending
Application number
JP11550377A
Other languages
Japanese (ja)
Inventor
Masayuki Ishibashi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP11550377A priority Critical patent/JPS5450306A/en
Publication of JPS5450306A publication Critical patent/JPS5450306A/en
Pending legal-status Critical Current

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  • Detection And Correction Of Errors (AREA)

Abstract

PURPOSE: To detect the block error of a magnetic tape by providing such a special track in each block as has a redundant checking portion having a different length from a reference length.
CONSTITUTION: The output of an AND circuit 18 becomes the block detecting signals indicating that the leading end of each block of a magnetic tape arrives. In case the leading end of the block passes through a magnetic tape, a special track has a preset unit of its leading end recorded with no information so that the output of an OR circiut 10 is reduced to a low level, thus allowing only a flip-flop 26 to maintain its reset condition. As a result, the signals to be fed to the input terminals 29d, 29e and 29f of a coincidence circiut 29 take the levels of 1, 0 and 0, respectively. The circuit 29 compares the signals C to be fed to is other input terminals 29a, 29b and 29c and the signals to be fed to its input terminals 29d, 29e and 29f. In case they are not coincident, the block error generating signals of high levels are fed to an AND circuit 33
COPYRIGHT: (C)1979,JPO&Japio
JP11550377A 1977-09-28 1977-09-28 Block error detection of magnetic tape Pending JPS5450306A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11550377A JPS5450306A (en) 1977-09-28 1977-09-28 Block error detection of magnetic tape

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11550377A JPS5450306A (en) 1977-09-28 1977-09-28 Block error detection of magnetic tape

Publications (1)

Publication Number Publication Date
JPS5450306A true JPS5450306A (en) 1979-04-20

Family

ID=14664121

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11550377A Pending JPS5450306A (en) 1977-09-28 1977-09-28 Block error detection of magnetic tape

Country Status (1)

Country Link
JP (1) JPS5450306A (en)

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