US4864428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disk player having variable spindle speed for continuous audio in fast and slow reproduction modes
Assignee: Pioneer Corp
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Filing: 1988-02-26
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Granted: 1989-09-05
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Expires: 2008-02-26
Abstract
Abstract A disk player in which the audio signal can be reproduced during FAST and SLOW playing modes. The speed of the spindle motor is controlled in accordance with the phase and frequency difference between a reference synchronizing signal and a synchronizing signal derived from information read from the disk. The frequency of the reference synchronizing signal is made variable to vary the speed of the spindle and hence the speed of reproduction of the disk.
Inventors
- 👤 Hitoshi Kanamaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:11
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/005; G11B19/00; G11B19/20; G11B19/28; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/937; H04N9/00; H04N9/79; H04N9/7921; H04N9/80; H04N9/802; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
In a disk player for playing a disk containing audio and video information comprising a video memory capable of storing video information for at least one field of a reproduced video signal, means for providing a reference synchronizing signal, means for providing a synchronizing signal derived from information read from an information recording disk, means for detecting at least one of the frequency and phase difference between said reference synchronizing signal and said synchronizing signal derived from information read from an information recording disk, a motor for rotating said information recording disk, means for controlling the rotational speed of said motor depending on at least one of the frequency and phase difference detected by said detecting means, and means for supplying readout clock signals to readout data stored in said video memory: the improvement wherein said means for supplying readout clock signals supplies clock signals at a fixed frequency, and said means for providing a reference synchronizing signal includes means for varying the frequency of the reference synchronizing signal and said means for controlling the rotational speed of said motor.
Claim 2
Dependent Claim
180 words
In a disk player for playing a disk containing audio and video information comprising a video memory capable of storing video information for at least one field of a reproduced video signal, means for providing a reference synchronizing signal, means for providing a synchronizing signal derived from information read from an information recording disk, means for detecting at least one of the frequency and phase difference between said reference synchronizing signal and said synchronizing signal derived from information read from an information recording disk, a motor for rotating said information recording disk, means for controlling the rotational speed of said motor depending on at least one of the frequency and phase difference detected by said detecting means, and means for supplying readout clock signals to readout data stored in said video memory: the improvement wherein said means for supplying readout clock signals supplies clock signals at a fixed frequency, and said means for providing a reference synchronizing signal includes means for varying the frequency of the reference synchronizing signal and said means for controlling the rotational speed of said motor.
Claim 3
Dependent Claim
20 words
The disk player of claim 1, wherein said means for providing said reference synchronizing signal comprises a variable frequency source.
Claim 4
Dependent Claim
34 words
The disk player of claim 1, wherein said means for providing said reference synchronizing signal comprises a fixed-frequency signal source and a first frequency divider coupled to an output of said fixed-frequency signal source.
Claim 5
Dependent Claim
34 words
The disk player of claim 3, further comprising a second frequency divider disposed in a path of said synchronizing signal derived from information read from said information recording disk prior to said detecting means.
Claim 6
Dependent Claim
101 words
The disk player of claim 1,further comprising: means for separating a first vertical synchronizing signal from said video signal to be written to said video memory; means for separating a second vertical synchronizing signal from said video signal read from said video memory; means for detecting the time difference between said first and second vertical synchronizing signals, said time difference detecting means generatng an output signal when said time difference is within a predetermined range; and means for inhibiting the writing of new video information to said video memory in accordance with said output signal of said time difference detecting means.
Claim 7
Dependent Claim
24 words
The disk player of claim 5, wherein said predetermined range for said time difference is set in accordance with a play operation speed signal.
References Cited (Backward Citations)
US4675749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |