US4607360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time-axis correcting circuit for recorded data reproducing device
Assignee: Pentax Corp
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Filing: 1983-12-12
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Granted: 1986-08-19
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Expires: 2003-12-12
Abstract
Abstract A time-axis correcting circuit for a recorded data reproducing device, such as a video tape player or video disc player, in which dominant and other time-axis errors are substantially completely suppressed. The reproduced signal is applied to the input of a variable delay circuit. A timing data component, such as the color burst signal, is separated from the delayed reproduced signal and applied to a flywheel oscillator, the open-loop oscillation frequency of which is set at least approximately to the frequency of a dominant time-axis error component to be suppressed. The output of the flywheel oscillator is applied through a voltage-controlled oscillator to the control input of the variable delay circuit.
Inventors
- 👤 Tsutomu Fukui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:03
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/89; H04N9/893
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
149 words
A time-axis correcting circuit for a recorded data reproducing device comprising: a variable delay circuit receiving as an input a reproduced signal including a timing data component, said variable delay circuit delaying said reproduced signal by a time period determined by a control signal applied to said variable delay circuit; a separating circuit for separating said timing data component from the delayed reproduced signal outputted by said variable delay circuit; a flywheel oscillator, having a control input coupled to an output of said separating circuit for producing a reference signal, said flywheel oscillator comprising a closed-loop control system having an oscillation frequency at least approximately equal to a frequency of a dominant time-axis error component in said reproduced signal; and a voltage-controlled oscillator receiving as an input said reference signal produced by said flywheel oscillator and producing in response thereto said control signal applied to said variable delay circuit.
Claim 2
Dependent Claim
149 words
A time-axis correcting circuit for a recorded data reproducing device comprising: a variable delay circuit receiving as an input a reproduced signal including a timing data component, said variable delay circuit delaying said reproduced signal by a time period determined by a control signal applied to said variable delay circuit; a separating circuit for separating said timing data component from the delayed reproduced signal outputted by said variable delay circuit; a flywheel oscillator, having a control input coupled to an output of said separating circuit for producing a reference signal, said flywheel oscillator comprising a closed-loop control system having an oscillation frequency at least approximately equal to a frequency of a dominant time-axis error component in said reproduced signal; and a voltage-controlled oscillator receiving as an input said reference signal produced by said flywheel oscillator and producing in response thereto said control signal applied to said variable delay circuit.
Claim 3
Dependent Claim
23 words
The time-axis correcting circuit of claim 1, further comprising a phase correcting circuit coupled between said flywheel oscillator and said variable delay circuit.
Claim 4
Dependent Claim
103 words
The time-axis correcting circuit of claim 1, wherein said flywheel oscillator comprises: a phase comparator having a first input coupled to said output of said separating circuit; a sample-and-hold circuit having an input coupled to an output of said phase comparator; a phase correcting circuit having an input coupled to an output of said sample-and-hold circuit, said reference signal being produced on an output of said phase correcting circuit; and a second voltage-controlled oscillator having an input coupled to said output of said phase correcting circuit, an output of said second voltage-controlled oscillator being coupled to a second input of said phase comparator.
Claim 5
Dependent Claim
15 words
The time-axis correcting circuit of claim 3, wherein said phase correcting circuit comprises an integrator.
Claim 6
Dependent Claim
18 words
The time-axis correcting circuit of claim 3, wherein said phase comparator has a conversion gain greater than unity.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |