Patent US4885644A successfully refreshed from Google Patents.
US4885644A
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US
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Spindle servo device for data recording disk reproducing apparatus
Assignee: Pioneer Corp
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Filing: 1988-12-22
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Granted: 1989-12-05
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Expires: 2008-12-22
Abstract
Abstract An apparatus for playing a composite disk containing separate audio-only and video-plus-audio portions, as well as an ordinary compact disk. It is first detected whether the disk being played is a compact disk or a composite disk, and if the disk is a composite disk, whether the portion presently being played is a region containing only audio data or a region containing a frequency modulated video signal recorded in multiplex form with a digital signal. A reference signal for driving a spindle servo circuit is produced as a fixed frequency signal when the disk is a composite disk or the region of a composite disk being played contains only audio data, and as a variable frequency signal of frequency determined in accordance with the frame sync signal contained in the reproduced signal when a region of a composite disk containing a multiplex-type signal is being reproduced.
Inventors
- 👤 Hidehiro Ishii
- 👤 Junichi Yoshio
- 👤 Osamu Watanabe
- 👤 Takeshi Izumo
- 👤 Noriyoshi Takeya
- 👤 Kazuhiko Katakami
- 👤 Masayori Shinohara
- 👤 Masao Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:52
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/802; G; G11; G11B; G11B19/00; G11B19/02; G11B19/12; G11B19/20; G11B19/28; G11B20/00; G11B27/00; G11B27/002; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
223 words
In a spindle servo device for a data recording disk reproducing apparatus in which a spindle motor rotationally drives said disk and said disk has a region in which a frequency modulated video signal and a prescribed digital signal are recorded in multiplex form in a location at least partially in the radial direction of the disk, the improvement comprising; means for detecting a phase difference between a synchronizing signal contained in a reproduced digital signal and a reference signal; means for generating a control signal based on the detected phase difference; means for controlling a rotational speed of a spindle motor driving said disk in accordance with said control signal; means for indicating whether said disk is a compact disk or a composite disk, and if said disk is a composite disk, whether a portion being played is a first region containing only audio data or a second region, which is said region in which a frequency modulated video signal and a prescribed digital signal are recorded in multiplex form; and means for providing said reference signal as a fixed frequency signal when said indicating means indicates said disk is a compact disk or a first region of a composite disk and as a variable frequency when said disk is a composite disk and a portion being played is said second region.
Claim 2
Dependent Claim
223 words
In a spindle servo device for a data recording disk reproducing apparatus in which a spindle motor rotationally drives said disk and said disk has a region in which a frequency modulated video signal and a prescribed digital signal are recorded in multiplex form in a location at least partially in the radial direction of the disk, the improvement comprising; means for detecting a phase difference between a synchronizing signal contained in a reproduced digital signal and a reference signal; means for generating a control signal based on the detected phase difference; means for controlling a rotational speed of a spindle motor driving said disk in accordance with said control signal; means for indicating whether said disk is a compact disk or a composite disk, and if said disk is a composite disk, whether a portion being played is a first region containing only audio data or a second region, which is said region in which a frequency modulated video signal and a prescribed digital signal are recorded in multiplex form; and means for providing said reference signal as a fixed frequency signal when said indicating means indicates said disk is a compact disk or a first region of a composite disk and as a variable frequency when said disk is a composite disk and a portion being played is said second region.
Claim 3
Dependent Claim
25 words
The spindle servo device of claim 1, wherein said variable frequency is determined in accordance with a frame sync signal contained in said reproduced signal.
References Cited (Backward Citations)
US4611319A
Cited
US4698695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |