Patent US3791729A successfully refreshed from Google Patents.
Patent US4322747A successfully refreshed from Google Patents.
US4322747A
Expired / Lapsed
US
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Rapid synchronization of information on separate recorded mediums
Assignee: RCA Corp
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Filing: 1980-07-30
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Granted: 1982-03-30
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Expires: 2000-07-30
Abstract
Abstract Separate durations of acceleration and constant velocity are utilized to attain phase locking between a recorded sync signal and an external reference sync signal while accelerating a recorded medium from an intermediate velocity to its operational velocity, with each duration being proportional to the intermediate velocity.
Inventors
- 👤 Robert A. Dischert
- 👤 James M. Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:41
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/48; G11B27/00; G11B27/10; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
In a replay system of the type wherein a recorded medium having a sync signal disposed thereon to identify discrete segments of information must be brought up to its operational velocity at which the recorded sync signal must be phase locked with an external reference sync signal, the improvement comprising: framing means for controlling the recorded medium to accelerate it from an intermediate velocity to the operational velocity while its velocity is held constant before reaching the operational velocity to cause slippage between the recorded and reference sync signals in providing for the phase lock therebetween, with the separate durations of the acceleration and constant velocity being derived in proportion to the intermediate velocity.
Claim 2
Dependent Claim
114 words
In a replay system of the type wherein a recorded medium having a sync signal disposed thereon to identify discrete segments of information must be brought up to its operational velocity at which the recorded sync signal must be phase locked with an external reference sync signal, the improvement comprising: framing means for controlling the recorded medium to accelerate it from an intermediate velocity to the operational velocity while its velocity is held constant before reaching the operational velocity to cause slippage between the recorded and reference sync signals in providing for the phase lock therebetween, with the separate durations of the acceleration and constant velocity being derived in proportion to the intermediate velocity.
Claim 3
Dependent Claim
36 words
The replay system of claim 1 wherein said framing means accelerates the recorded medium from the intermediate velocity to the operational velocity in distinct intervals between which the constant velocity is maintained for a single interval.
Claim 4
Dependent Claim
22 words
The replay system of claim 1 wherein the recorded medium is accelerated from rest to the intermediate velocity during a preliminary cycle.
Claim 5
Dependent Claim
92 words
The replay system of claim 1 wherein the duration of the acceleration is fixed to reach the operational velocity in a time corresponding to the duration of a number of reference sync signal pulses equal to the inverse of the average velocity sustained while passing between the intermediate and operational velocities and the duration of the constant velocity is fixed to correspond in time with the duration of a number of reference sync signal pulses equal to the inverse of one minus the ratio of the intermediate velocity over the operational velocity.
Claim 6
Dependent Claim
110 words
The replay system of claim 1 and further including a transport system for the recorded medium; said transport system including a frequency controlled D.C. motor which is driven by a voltage controlled oscillator in a closed loop arrangement, said voltage controlled oscillator receiving its input through a switch which is controlled by a first signal from a logic circuit to interrupt said closed loop arrangement and apply the output of a ramp generator to said voltage controlled oscillator during the framing cycle, said ramp generator being controlled by a second signal from said logic circuit to determine the separate durations of the acceleration and constant velocity during the framing cycle.
Claim 7
Dependent Claim
23 words
The replay system of claim 1 wherein the intermediate velocity attained by the recorded medium is equal to one-half the operational velocity thereof.
References Cited (Backward Citations)
US3230307A
Cited
US3478178A
Cited
US3643012A
Cited
US3651276A
Cited
US3638089A
Cited
US3787615A
Cited
US3887941A
Cited
US4224645A
Cited
US4224645B1
Cited
US4163263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |