JPS5690647A - Scrambler circuit - Google Patents

Scrambler circuit

Info

Publication number
JPS5690647A
JPS5690647A JP16792379A JP16792379A JPS5690647A JP S5690647 A JPS5690647 A JP S5690647A JP 16792379 A JP16792379 A JP 16792379A JP 16792379 A JP16792379 A JP 16792379A JP S5690647 A JPS5690647 A JP S5690647A
Authority
JP
Japan
Prior art keywords
counter
memory
contents
pseudo
synchronizing signal
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
JP16792379A
Other languages
Japanese (ja)
Other versions
JPS5838981B2 (en
Inventor
Takeo Fukushima
Toshiichi Yamakawa
Masami Mizuguchi
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 JP54167923A priority Critical patent/JPS5838981B2/en
Publication of JPS5690647A publication Critical patent/JPS5690647A/en
Publication of JPS5838981B2 publication Critical patent/JPS5838981B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used

Abstract

PURPOSE:To prevent a synchronizing signal from being scrambled by reading a pseudo-random pulse string out of a memory according to the contents of a counter, by scrambling the input signal while resetting the counter at the timing of the synchronizing signal, and then by setting all contents of the memory to zero. CONSTITUTION:As memory 57, ROM is used and stored with prescribed pseudo- random patterns. A carry output, when generated, is inputted to input terminals P0-P4 of counter 58, which operates as a 1/31 frequency divider. According to the contents of counter 58, a pseudo-random pulse string is read out of memory 57 and the input signal is scrambled. At the timing of the synchronizing signal, counter 58 is reset and according to the all-''0'' contents of counter 58, all-''0'' data are read out of memory 57.
JP54167923A 1979-12-22 1979-12-22 scrambler circuit Expired JPS5838981B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP54167923A JPS5838981B2 (en) 1979-12-22 1979-12-22 scrambler circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54167923A JPS5838981B2 (en) 1979-12-22 1979-12-22 scrambler circuit

Publications (2)

Publication Number Publication Date
JPS5690647A true JPS5690647A (en) 1981-07-22
JPS5838981B2 JPS5838981B2 (en) 1983-08-26

Family

ID=15858557

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54167923A Expired JPS5838981B2 (en) 1979-12-22 1979-12-22 scrambler circuit

Country Status (1)

Country Link
JP (1) JPS5838981B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287469A (en) * 1986-06-06 1987-12-14 Hitachi Medical Corp Magnetic recording and reproducing device
EP0923035A2 (en) * 1997-12-09 1999-06-16 Nec Corporation Encoding circuit and method of detecting block code boundary and establishing synchronization between scrambler and descrambler

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59194605U (en) * 1983-06-10 1984-12-24 三菱電機株式会社 tightening device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287469A (en) * 1986-06-06 1987-12-14 Hitachi Medical Corp Magnetic recording and reproducing device
EP0923035A2 (en) * 1997-12-09 1999-06-16 Nec Corporation Encoding circuit and method of detecting block code boundary and establishing synchronization between scrambler and descrambler
EP0923035A3 (en) * 1997-12-09 2006-04-12 Nec Corporation Encoding circuit and method of detecting block code boundary and establishing synchronization between scrambler and descrambler

Also Published As

Publication number Publication date
JPS5838981B2 (en) 1983-08-26

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