JPS6420752A - Frame synchronizing circuit - Google Patents

Frame synchronizing circuit

Info

Publication number
JPS6420752A
JPS6420752A JP62177516A JP17751687A JPS6420752A JP S6420752 A JPS6420752 A JP S6420752A JP 62177516 A JP62177516 A JP 62177516A JP 17751687 A JP17751687 A JP 17751687A JP S6420752 A JPS6420752 A JP S6420752A
Authority
JP
Japan
Prior art keywords
protection
circuit
hunting
frame
stages
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
JP62177516A
Other languages
Japanese (ja)
Inventor
Satoshi Nishimura
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 JP62177516A priority Critical patent/JPS6420752A/en
Publication of JPS6420752A publication Critical patent/JPS6420752A/en
Pending legal-status Critical Current

Links

Landscapes

  • Time-Division Multiplex Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE:To prevent the number of stages for backward protection from counting erroneously by stopping the input clock to a frame counter during hunting. CONSTITUTION:If a synchronizing protection circuit 1 outputs an alarm ALM and is in the hunting state by the forward protection of the circuit 1, a clock gate circuit 3 stops the supply of the clock CLK given to the frame counter 2 at that point of time. Thus, even if the frame pattern pulse FP and the decoded pulse of the counter 3 are detected at the same time during the hunting, the number of stages for backward protection of the circuit 1 is not affected and even when the frame pattern is detected at any point of time in the hunting state, the malfunction changing the protection stage number is avoided.
JP62177516A 1987-07-16 1987-07-16 Frame synchronizing circuit Pending JPS6420752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62177516A JPS6420752A (en) 1987-07-16 1987-07-16 Frame synchronizing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62177516A JPS6420752A (en) 1987-07-16 1987-07-16 Frame synchronizing circuit

Publications (1)

Publication Number Publication Date
JPS6420752A true JPS6420752A (en) 1989-01-24

Family

ID=16032278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62177516A Pending JPS6420752A (en) 1987-07-16 1987-07-16 Frame synchronizing circuit

Country Status (1)

Country Link
JP (1) JPS6420752A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0377446A (en) * 1989-08-19 1991-04-03 Fujitsu Ltd Forward-backward protection counter
JP2006165179A (en) * 2004-12-06 2006-06-22 Denso Corp Semiconductor device and manufacturing method therefor
KR100747674B1 (en) * 2000-02-21 2007-08-08 소니 가부시끼 가이샤 Hologram recording medium, hologram recording device and method
KR100785595B1 (en) * 2005-12-22 2007-12-13 주식회사 대우일렉트로닉스 Mask to record holographic data, manufacturing method thereof and holographic data recording method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0377446A (en) * 1989-08-19 1991-04-03 Fujitsu Ltd Forward-backward protection counter
KR100747674B1 (en) * 2000-02-21 2007-08-08 소니 가부시끼 가이샤 Hologram recording medium, hologram recording device and method
JP2006165179A (en) * 2004-12-06 2006-06-22 Denso Corp Semiconductor device and manufacturing method therefor
KR100785595B1 (en) * 2005-12-22 2007-12-13 주식회사 대우일렉트로닉스 Mask to record holographic data, manufacturing method thereof and holographic data recording method

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