JPS6423467A - Pll circuit for information reproducing device - Google Patents
Pll circuit for information reproducing deviceInfo
- Publication number
- JPS6423467A JPS6423467A JP62179667A JP17966787A JPS6423467A JP S6423467 A JPS6423467 A JP S6423467A JP 62179667 A JP62179667 A JP 62179667A JP 17966787 A JP17966787 A JP 17966787A JP S6423467 A JPS6423467 A JP S6423467A
- Authority
- JP
- Japan
- Prior art keywords
- pll
- reproducing signal
- missing
- restoration
- holding
- 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
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To prevent out of synchronism of a PLL at missing of a reproducing signal and at restoration by holding a recovered clock frequency and phase just after missing of the reproducing signal, releasing the holding after the restoration of the reproducing signal and adjusting the sensitivity of the PLL to a required value. CONSTITUTION:If a reproducing signal is missing, the output S1 of a reproducing signal missing detection circuit 4 goes to H, a sampling and holding circuit 5 provided to a PLL holds the frequency and phase of the recovered clock just after the missing to prevent out of synchronism of the PLL at the reproducing signal missing. The holding of the circuit 5 is released similarly at the restoration of the reproducing signal and a switching output S3 from a switching signal generating circuit 7 goes to H, switches SW1, SW2 for an LPF2 and an attenuator 6 are changed over, the sensitivity of the PLL is brought into a low level, then the out of synchronism at the restoration of the reproducing signal is prevented without the effect of the overshoot characteristic of the PLL. When a phase error goes within a prescribed value, the switches SW1, SW2 are changed over similarly and the sensitivity of the PLL is brought into a high level.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179667A JPS6423467A (en) | 1987-07-17 | 1987-07-17 | Pll circuit for information reproducing device |
US07/220,795 US4974221A (en) | 1987-07-17 | 1988-07-13 | Method and apparatus for reproducing information by varying a sensitivity of a phase-locked loop in accordance with a detection state of a reproduced signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62179667A JPS6423467A (en) | 1987-07-17 | 1987-07-17 | Pll circuit for information reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6423467A true JPS6423467A (en) | 1989-01-26 |
Family
ID=16069769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62179667A Pending JPS6423467A (en) | 1987-07-17 | 1987-07-17 | Pll circuit for information reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6423467A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH066178A (en) * | 1992-06-23 | 1994-01-14 | Japan Radio Co Ltd | Afc circuit |
JPH06311030A (en) * | 1993-04-21 | 1994-11-04 | Nec Corp | Pll circuit |
WO2008123215A1 (en) | 2007-03-28 | 2008-10-16 | Asahi Kasei Chemicals Corporation | Process for production of modified conjugated diene polymer, compositions comprising the polymer, and tires containing the compositions |
-
1987
- 1987-07-17 JP JP62179667A patent/JPS6423467A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH066178A (en) * | 1992-06-23 | 1994-01-14 | Japan Radio Co Ltd | Afc circuit |
JPH06311030A (en) * | 1993-04-21 | 1994-11-04 | Nec Corp | Pll circuit |
WO2008123215A1 (en) | 2007-03-28 | 2008-10-16 | Asahi Kasei Chemicals Corporation | Process for production of modified conjugated diene polymer, compositions comprising the polymer, and tires containing the compositions |
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