Patent US3787616A successfully refreshed from Google Patents.
US3787616A
Expired / Lapsed
US
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Time base error correction system and method
Assignee: American Videonetics Corp
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Filing: 1972-06-05
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Granted: 1974-01-22
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Expires: 1992-06-05
Abstract
Abstract A time base error correction system particularly useful in a magnetic recording or playback system for transducing signals relative to a magnetic record medium prepared with discrete signals thereon, or being applied thereto, at substantially regular, predetermined intervals along with information signals all to be transduced as the medium moves in a predetermined direction. A magnetic transducer cooperates with the medium to sense these signals to provide a first train of electric signals. Means are provided for generating a second train of signals at a desired repetition rate. A comparing means is coupled to receive both the first and second trains of signals and arranged to provide an output control signal representative of the phase difference between the two trains. Finally, means supporting the transducer means and responsive to the control signal adjusts the phase of the first train of signals by advancing or retarding the position of the transducer means along the direction of movement of the medium.
Inventors
- 👤 M Falk
- 👤 L Olah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:44
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/02; G11B21/03
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
171 words
In a magnetic recording or playback system for transducing signals relative to a magnetic record medium having discrete signals thereon at substantially regular predetermined intervals and information signals all to be transduced as said medium moves in a predetermined direction, magnetic transducer means disposed to cooperate with said medium to sense said signals to provide a first train of electric signals, means for generating a second train of signals at a desired repetition rate, comparing means coupled to receive both said first and second trains of signals and serving to provide an output control signal representative of the phase difference between the two trains, means supporting said transducer means and responsive to said control signal for adjusting the phase of said first train of signals by advancing or retarding the position of said transducer means along the direction of movement of the medium, and means for adjusting the phase of said second trains of signals in response to prolonged phase differences between said first train of signals and said second train.
Claim 2
Dependent Claim
171 words
In a magnetic recording or playback system for transducing signals relative to a magnetic record medium having discrete signals thereon at substantially regular predetermined intervals and information signals all to be transduced as said medium moves in a predetermined direction, magnetic transducer means disposed to cooperate with said medium to sense said signals to provide a first train of electric signals, means for generating a second train of signals at a desired repetition rate, comparing means coupled to receive both said first and second trains of signals and serving to provide an output control signal representative of the phase difference between the two trains, means supporting said transducer means and responsive to said control signal for adjusting the phase of said first train of signals by advancing or retarding the position of said transducer means along the direction of movement of the medium, and means for adjusting the phase of said second trains of signals in response to prolonged phase differences between said first train of signals and said second train.
Claim 3
Dependent Claim
178 words
In a magnetic recording or playback system for transducing signals relative to a magnetic record medium having discrete signals thereon at substantially regular predetermined intervals and information signals all to be transduced as said medium moves in a predetermined direction, said information and regular signals being contained in the same record track along said medium, said information signals constituting video signals and said regular signals constituting a synchronizing pulse for the video signals, magnetic transducer means disposed to cooperate with said medium to sense said signals to provide a first train of electric signals, means for generating a second train of signals at a desired repetition rate, comparing means coupled to receive both said first and said second trains of signals and serving to provide an output control signal representative of the phase difference between the two trains, and means supporting said transducer means and responsive to said control signal for adjusting the phase of said first train of signals by advancing or retarding the position of said transducer means along the direction of movement of the medium.
Claim 4
Dependent Claim
178 words
In a magnetic recording or playback system for transducing signals relative to a magnetic record medium having discrete signals thereon at substantially regular predetermined intervals and information signals all to be transduced as said medium moves in a predetermined direction, said information and regular signals being contained in the same record track along said medium, said information signals constituting video signals and said regular signals constituting a synchronizing pulse for the video signals, magnetic transducer means disposed to cooperate with said medium to sense said signals to provide a first train of electric signals, means for generating a second train of signals at a desired repetition rate, comparing means coupled to receive both said first and said second trains of signals and serving to provide an output control signal representative of the phase difference between the two trains, and means supporting said transducer means and responsive to said control signal for adjusting the phase of said first train of signals by advancing or retarding the position of said transducer means along the direction of movement of the medium.
Claim 5
Dependent Claim
141 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, said timing and information signals being disposed along separate record tracks of said medium, transducer means disposed to cooperate with said medium to sense said timing signals to provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference.
Claim 6
Dependent Claim
141 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, said timing and information signals being disposed along separate record tracks of said medium, transducer means disposed to cooperate with said medium to sense said timing signals to provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference.
Claim 7
Dependent Claim
142 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, said timing and information signals being disposed along the same record track of said medium, transducer means disposed to cooperate with said medium to sense said timing signals and provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference.
Claim 8
Dependent Claim
142 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, said timing and information signals being disposed along the same record track of said medium, transducer means disposed to cooperate with said medium to sense said timing signals and provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference.
Claim 9
Dependent Claim
171 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, transducer means disposed to cooperate with said medium to sense said timing signals and provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference, said supporting means comprising an elongate bi-morph support member characterized by ability to bend in one direction in response to a positive polarity signal applied to the surfaces thereof and in a reverse direction to a negative polarity signal applied to the surfaces thereof.
Claim 10
Dependent Claim
171 words
In a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, transducer means disposed to cooperate with said medium to sense said timing signals and provide electric signal representations thereof and to transduce said information signals along an information track, means for receiving said signal representations and for providing control signals representative of phase differences between the timing signals and a substantially constant reference, means supporting said transducer means and coupled to respond to said control signals to advance or retard the position of said transducer means along said information track in proportionate relation to said control signals so as to compensate for changes in the phase of the timing signals and said information signals relative to said reference, said supporting means comprising an elongate bi-morph support member characterized by ability to bend in one direction in response to a positive polarity signal applied to the surfaces thereof and in a reverse direction to a negative polarity signal applied to the surfaces thereof.
Claim 11
Dependent Claim
132 words
In the transducing of record signals relative to a moving record medium using a transducer head the method of adjusting the rate of transducing said signals relative to said medium to correspond substantially to a predetermined signal repetition rate comprising the steps of transducing a first train of substantially regularly occurring record signals relative to the moving record medium, generating a second train of electric signals at the desired repetition rate, forming a control signal proportionate to momentary differences between said repetition rates, mechanically advancing or retarding said transducer head in the direction of movement of said medium under control of and in response to said control signal, and adjusting the phase or timing of said second train iN response to prolonged changes in the phase or timing of said first train.
Claim 12
Dependent Claim
132 words
In the transducing of record signals relative to a moving record medium using a transducer head the method of adjusting the rate of transducing said signals relative to said medium to correspond substantially to a predetermined signal repetition rate comprising the steps of transducing a first train of substantially regularly occurring record signals relative to the moving record medium, generating a second train of electric signals at the desired repetition rate, forming a control signal proportionate to momentary differences between said repetition rates, mechanically advancing or retarding said transducer head in the direction of movement of said medium under control of and in response to said control signal, and adjusting the phase or timing of said second train iN response to prolonged changes in the phase or timing of said first train.
Claim 13
Dependent Claim
105 words
For use in a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, transducer means adapted to be disposed in cooperation with said medium to sense said timing signals and provide electric signal representations thereof, said transducer means comprising a signal transducer and an elongate bi-morph support member, said transducer being carried at the distal end of said member, said member being characterized by ability to bend in one direction in response to a positive polarity signal applied to the surfaces thereof and in a reverse direction to a negative polarity signal applied to the surfaces thereof.
Claim 14
Dependent Claim
105 words
For use in a system for transducing information and timing signals relative to a record medium moving in a predetermined direction, transducer means adapted to be disposed in cooperation with said medium to sense said timing signals and provide electric signal representations thereof, said transducer means comprising a signal transducer and an elongate bi-morph support member, said transducer being carried at the distal end of said member, said member being characterized by ability to bend in one direction in response to a positive polarity signal applied to the surfaces thereof and in a reverse direction to a negative polarity signal applied to the surfaces thereof.
References Cited (Backward Citations)
US2656419A
Cited
US2854526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |