US4763205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of time axis control in an information recording system for compensation of tracking error caused by track jumping
Assignee: Pioneer Corp
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Filing: 1985-08-20
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Granted: 1988-08-09
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Expires: 2005-08-20
Abstract
Abstract A method for time axis control for performing both coarse and fine time axis adjustment in accordance with relative speeds of a recording disk and a playback unit while the playback unit is recording or reproducing signals on or from the disk, wherein a color image is displayed during a scanning operation, which displayed image is natural in appearance. The pickup unit is first caused to follow a track formed on the recording medium in a tracking control operation. Repetitive track jumping operations are then effected over successive tracks by moving the pickup unit. For the track jumping operations, a time constant circuit within a circuit which performs the fine time axis adjustment is reset at least for the duration of each track jumping operation.
Inventors
- 👤 Takashi Okano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:47
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/02; G11B20/025; G11B27/00; G11B27/10; H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H04N5/95; H04N5/953; Y; Y10; Y10S; Y10S358/00; Y10S358/907
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A method of time axis control for performing coarse time axis adjustment and fine time axis adjustment in accordance with relative speeds of a recording medium and signal recording/playback means while said signal recording/playback means is recording or reproducing signals on or from said recording medium, comprising the steps of: in a tracking control operation, causing said signal recording/playback means to follow a track formed on said recording medium; performing coarse and fine time axis adjustment including using a time constant means; effecting repetitive track jumping operations over successive tracks by moving said signal recording/playback means; and resetting said time constant means only for the duration of each track jumping operation.
Claim 2
Independent Claim
111 words
A method of time axis control for performing coarse time axis adjustment and fine time axis adjustment in accordance with relative speeds of a recording medium and signal recording/playback means while said signal recording/playback means is recording or reproducing signals on or from said recording medium, comprising the steps of: in a tracking control operation, causing said signal recording/playback means to follow a track formed on said recording medium; performing coarse and fine time axis adjustment including using a time constant means; effecting repetitive track jumping operations over successive tracks by moving said signal recording/playback means; and resetting said time constant means only for the duration of each track jumping operation.
Claim 3
Dependent Claim
52 words
The method of time axis control according to claim 1, in which said fine time axis adjustment is carried out by means of a CCD, and in which said step of resetting said time constant means comprises discharging a time constant circuit contained in a time axis control system including said CCD.
Claim 4
Dependent Claim
65 words
The method of time axis control according to claim 1, in which performing said fine time axis adjustment includes the step of controlling a position of said signal recording/playback means, and in which said step of resetting said time constant means is followed by the step of restoring said signal recording/playback means to a center position only for the duration of each track jumping operation.
Claim 5
Dependent Claim
47 words
The method of time axis control according to claim 1, wherein said step of resetting said time constant means comprises the step of resetting a counter that produces frequency-divided pulses used as reference pulses for comparing a phase of a synchronizing signal read from said recording medium.
Claim 6
Dependent Claim
45 words
The method of time axis control according to claim 4, wherein said step of resetting said time constant means further comprises resetting a time constant circuit in an equalizer circuit through which a phase comparison signal produced as a result of said phase comparing passes.
Claim 7
Dependent Claim
40 words
The method of claim 1, wherein said coarse time axis adjustment and said fine time axis adjustment are effected with circuitry, a portion of which is used for both said coarse time axis adjustment and said fine time axis adjustment.
Claim 8
Dependent Claim
26 words
The method of time axis control of claim 1, wherein said coarse time axis adjustment and said fine time axis adjustment are effected with separate circuitry.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |