JPS5758253A - Control word protecting circuit - Google Patents

Control word protecting circuit

Info

Publication number
JPS5758253A
JPS5758253A JP55132870A JP13287080A JPS5758253A JP S5758253 A JPS5758253 A JP S5758253A JP 55132870 A JP55132870 A JP 55132870A JP 13287080 A JP13287080 A JP 13287080A JP S5758253 A JPS5758253 A JP S5758253A
Authority
JP
Japan
Prior art keywords
signal
error
data
control signal
block
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
JP55132870A
Other languages
Japanese (ja)
Other versions
JPH0150027B2 (en
Inventor
Masaharu Kobayashi
Takao Arai
Takashi Hoshino
Shigeru Yamazaki
Chitoshi Hibino
Harukuni Kohari
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 Ltd
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Hitachi Ltd
Victor Company of Japan Ltd
Nippon Victor KK
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 Ltd, Victor Company of Japan Ltd, Nippon Victor KK filed Critical Hitachi Ltd
Priority to JP55132870A priority Critical patent/JPS5758253A/en
Publication of JPS5758253A publication Critical patent/JPS5758253A/en
Publication of JPH0150027B2 publication Critical patent/JPH0150027B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE:To prevent a control signal from being outputted as a data, by detecting a program searching signal, etc. in a control signal block, and applying it to a prescribed error detection word detecting output, so that the control signal block is not inputted to a data block. CONSTITUTION:A data 74 is inputted to a program searching signal detecting circuit 75, and whether it is a control signal block or a data block is decided. A counter 77 starts counting from the timing of a vertical synchronizing signal, and generates a gate signal 82 through a decoder 84. By a 2 input AND circuit 83, a detecting circuit output 76 coincides with the gate signal 82. A coincidence output 84 takes the sum with an error detection word detecting result 85 by a 2 input OR circuit 86. A sum output 87 becomes an error signal. In case when the error detection word detecting result 85 is an error, all become an error signal, but even if it is not an error, when a program searching signal has been detected during the period of H, the gate signal 82 becomes an error signal. By such a constitution, it is prevented that a control signal is outputted as a data.
JP55132870A 1980-09-26 1980-09-26 Control word protecting circuit Granted JPS5758253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55132870A JPS5758253A (en) 1980-09-26 1980-09-26 Control word protecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55132870A JPS5758253A (en) 1980-09-26 1980-09-26 Control word protecting circuit

Publications (2)

Publication Number Publication Date
JPS5758253A true JPS5758253A (en) 1982-04-07
JPH0150027B2 JPH0150027B2 (en) 1989-10-26

Family

ID=15091470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55132870A Granted JPS5758253A (en) 1980-09-26 1980-09-26 Control word protecting circuit

Country Status (1)

Country Link
JP (1) JPS5758253A (en)

Also Published As

Publication number Publication date
JPH0150027B2 (en) 1989-10-26

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