US5095475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording disk playing apparatus
Assignee: Pioneer Corp
•
Filing: 1990-10-17
•
Granted: 1992-03-10
•
Expires: 2010-10-17
Abstract
Abstract An information recorded disk player designed in such a way that spindle servo control is executed on the basis of a sync signal in a video signal while a reading clock for reading memory in a digital demodulation system is synchronized with a reproduced clock, and the low frequency component of a time base error signal is removed from a signal representing the phase difference between these clocks, thereby eliminating the eccentric component and improving the tone quality.
Inventors
- 👤 Tokiya Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:27
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/95; H04N5/956; G; G11; G11B; G11B19/00; G11B19/20; G11B19/28; H04N5/953
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
247 words
An information recorded disk player comprising: a spindle motor for driving an information recorded disk on which a high frequency FM signal carrying a composite video signal and a low frequency digital signal modulated to carry information datum have been recorded, superimposed one on the other; a pickup for reading out the high frequency FM signal and the low frequency digital signal from the information recorded disk; first demodulation means for demodulating the high frequency FM signal which was read out from the information recorded disk to provide a composite video signal; spindle servo means for controlling a speed of the spindle motor based on a time base error signal according to a phase difference between a sync signal in the composite video signal and a reference sync signal; second demodulation means for demodulating the low frequency digital signal read out from the information recorded disk; reproduced clock generating means for generating a reproduced clock phase-synchronized with the low frequency digital signal; write means for writing a demodulated output of the second demodulation means into a memory in synchronism with the reproduced clock; reading clock generating means for generating a reading clock to read recorded information from the memory; control means for controlling the reading clock generating means based on a phase difference signal according to a phase difference between the reproduced clock and the reading clock; and subtracting means for subtracting the time base error signal, caused by an eccentric component, from the phase difference signal.
Claim 2
Dependent Claim
247 words
An information recorded disk player comprising: a spindle motor for driving an information recorded disk on which a high frequency FM signal carrying a composite video signal and a low frequency digital signal modulated to carry information datum have been recorded, superimposed one on the other; a pickup for reading out the high frequency FM signal and the low frequency digital signal from the information recorded disk; first demodulation means for demodulating the high frequency FM signal which was read out from the information recorded disk to provide a composite video signal; spindle servo means for controlling a speed of the spindle motor based on a time base error signal according to a phase difference between a sync signal in the composite video signal and a reference sync signal; second demodulation means for demodulating the low frequency digital signal read out from the information recorded disk; reproduced clock generating means for generating a reproduced clock phase-synchronized with the low frequency digital signal; write means for writing a demodulated output of the second demodulation means into a memory in synchronism with the reproduced clock; reading clock generating means for generating a reading clock to read recorded information from the memory; control means for controlling the reading clock generating means based on a phase difference signal according to a phase difference between the reproduced clock and the reading clock; and subtracting means for subtracting the time base error signal, caused by an eccentric component, from the phase difference signal.
Claim 3
Dependent Claim
36 words
An information recorded disk player according to claim 1, wherein the subtracting means subtracts a low frequency component of the time base error signal from the phase difference signal only where the spindle servo is located.
Claim 4
Dependent Claim
169 words
A digital information demodulating system for demodulating a reproduced digital signal, said digital information demodulating system comprising: means for generating a reproduced digital signal containing digital information; demodulating means for demodulating said digital information of said reproduced digital signal and for producing a demodulation signal; memory means for storing said demodulation signal; writing means for writing the demodulation signal into said memory means in accordance with a reproduced clock; reproduced clock generating means for generating said reproduced clock from said digital information; reading clock generating means for generating a reading clock for reading out stored information from said memory means; phase control means for phase-controlling said reading clock from said reading clock generating means in accordance with a phase difference signal representing a phase difference between said reading clock and said reproduced clock, wherein stored information is read out from said memory means in synchronism with said reading clock; and subtracting mean for subtracting a time base error signal, caused by an eccentric component, from said phase difference signal.
Claim 5
Dependent Claim
169 words
A digital information demodulating system for demodulating a reproduced digital signal, said digital information demodulating system comprising: means for generating a reproduced digital signal containing digital information; demodulating means for demodulating said digital information of said reproduced digital signal and for producing a demodulation signal; memory means for storing said demodulation signal; writing means for writing the demodulation signal into said memory means in accordance with a reproduced clock; reproduced clock generating means for generating said reproduced clock from said digital information; reading clock generating means for generating a reading clock for reading out stored information from said memory means; phase control means for phase-controlling said reading clock from said reading clock generating means in accordance with a phase difference signal representing a phase difference between said reading clock and said reproduced clock, wherein stored information is read out from said memory means in synchronism with said reading clock; and subtracting mean for subtracting a time base error signal, caused by an eccentric component, from said phase difference signal.
References Cited (Backward Citations)
US4761692A
Cited
US5001570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |