Patent US5553043A successfully refreshed from Google Patents.
US5553043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information regenerating apparatus
Assignee: Sharp Corp
•
Filing: 1994-12-15
•
Granted: 1996-09-03
•
Expires: 2014-12-15
Abstract
Abstract In an information regenerating apparatus, recorded data constructed of a sector mark and a following header section having a plurality of data sets each having a pull-in pattern, an address mark and address information, is read out to form a regenerative signal which in turn is used to regenerate information. A phase-locked loop circuit in a signal synchronizing circuit, performs phase-synchronization with a regenerative signal at two different pull-in speeds. A speed indicating circuit, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of the sector mark as a reference point, instructs the phase-locked loop circuit to set up a fast response speed every time the pull-in pattern appears on the regenerative signal, and instructs the phase-locked loop circuit to set up a slow response speed every time the pull-in pattern disappears from the regenerative signal.
Inventors
- 👤 Takeshi Yamaguchi
- 👤 Hiroshi Fuji
- 👤 Hiroshige Hirashima
- 👤 Shigeo Terashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:34
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
192 words
An information regenerating apparatus, wherein recorded data constructed of a sector mark and a following header section having a plurality of data sets each having a pull-in pattern, an address mark and address information, is read out to form a regenerative signal which in turn is used to regenerate information, comprising: a phase-locked loop circuit for performing phase-synchronization with said regenerative signal at two different pull-in speeds; a mark detecting circuit which detects said address mark on synchronized data obtained by sampling said regenerative signal in synchronization with a regenerative clock produced in said phase-locked loop circuit; and a speed indicating circuit which, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of said sector mark as a reference point, gives an instruction to said phase-locked loop circuit to accelerate the response speed thereof every time said pull-in pattern appears on said regenerative signal, and which instructs said phase-locked loop circuit to slow down the response speed thereof every time said mark detecting circuit indicates the detection of an address mark.
Claim 2
Dependent Claim
192 words
An information regenerating apparatus, wherein recorded data constructed of a sector mark and a following header section having a plurality of data sets each having a pull-in pattern, an address mark and address information, is read out to form a regenerative signal which in turn is used to regenerate information, comprising: a phase-locked loop circuit for performing phase-synchronization with said regenerative signal at two different pull-in speeds; a mark detecting circuit which detects said address mark on synchronized data obtained by sampling said regenerative signal in synchronization with a regenerative clock produced in said phase-locked loop circuit; and a speed indicating circuit which, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of said sector mark as a reference point, gives an instruction to said phase-locked loop circuit to accelerate the response speed thereof every time said pull-in pattern appears on said regenerative signal, and which instructs said phase-locked loop circuit to slow down the response speed thereof every time said mark detecting circuit indicates the detection of an address mark.
Claim 3
Dependent Claim
192 words
An information regenerating apparatus, wherein recorded data having a sector mark, a following header section having data sets consisting of pull-in patterns, address marks and address information, and a data section having a data set of a pull-in pattern, a data mark and user information, is read out to form a regenerative signal which in turn is used to regenerate information, comprising: a phase-locked loop circuit for performing phase-synchronization with said regenerative signal at two different pull-in speeds; a synchronizing pattern detecting circuit for detecting a pull-in pattern; and a speed indicating circuit which, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of said sector mark as a reference point, instructs said phase-locked loop circuit to set up a fast response speed every time said pull-in pattern appears on said regenerative signal, and which instructs said phase-locked loop circuit to set up a slow response speed upon occurrence of one of said synchronizing pattern detecting circuit detecting a pull-in pattern or when said pull-in pattern disappears from said regenerative signal.
Claim 4
Dependent Claim
192 words
An information regenerating apparatus, wherein recorded data having a sector mark, a following header section having data sets consisting of pull-in patterns, address marks and address information, and a data section having a data set of a pull-in pattern, a data mark and user information, is read out to form a regenerative signal which in turn is used to regenerate information, comprising: a phase-locked loop circuit for performing phase-synchronization with said regenerative signal at two different pull-in speeds; a synchronizing pattern detecting circuit for detecting a pull-in pattern; and a speed indicating circuit which, based on the counting of the number of clock pulses from a reference clock signal from a time of the generation of a sector mark detection signal showing the detection of said sector mark as a reference point, instructs said phase-locked loop circuit to set up a fast response speed every time said pull-in pattern appears on said regenerative signal, and which instructs said phase-locked loop circuit to set up a slow response speed upon occurrence of one of said synchronizing pattern detecting circuit detecting a pull-in pattern or when said pull-in pattern disappears from said regenerative signal.
Claim 5
Dependent Claim
48 words
The apparatus of claim 2 wherein said speed indicating circuit instructs said phase-locked loop circuit to set up a slow response speed in accordance with the first to occur of said synchronizing pattern detecting circuit detecting said pull-in pattern or said pull-in pattern disappearing from said regenerative signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-03 | 2000-03-04 | 2000-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-03 | 2004-03-04 | 2004-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-03 | 2008-03-04 | 2008-09-03 | $7700.00 | Window Closed / Lapsed |