JPS6420752A - Frame synchronizing circuit - Google Patents
Frame synchronizing circuitInfo
- 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
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.
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)
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 |
-
1987
- 1987-07-16 JP JP62177516A patent/JPS6420752A/en active Pending
Cited By (4)
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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