US4001886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus with headwheel servo for recording and playing back video information
Assignee: US Philips Corp
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Filing: 1975-01-07
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Granted: 1977-01-04
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Expires: 1995-01-07
Abstract
Abstract Apparatus for synchronizing the head wheel of a video tape recorder with the recorded signals uses a variable frequency oscillator controlled by the phase difference between recorded vertical synchronized signals and signals received from a vertical reference oscillator to provide a horizontal reference signal. The horizontal reference signal is compared with recorded horizontal synchronized signals as a fine control during playback.
Inventors
- 👤 Antonius Isidorus Hofste op Bruinink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:04
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/11; G11B27/13; H; H02; H02P; H02P23/00; H02P23/18; H02P23/183; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
264 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, first detector means connected to said velocity measuring means and to said vertical synchronization signal for providing a first control signal, means for receiving a second vertical synchronization signal read from said tape during play back, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during playback and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, and switch means responsive during recording to a second control signal of said first detector means for selectively connecting said first control signal or said second control signal to said velocity controlling means.
Claim 2
Dependent Claim
264 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, first detector means connected to said velocity measuring means and to said vertical synchronization signal for providing a first control signal, means for receiving a second vertical synchronization signal read from said tape during play back, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during playback and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, and switch means responsive during recording to a second control signal of said first detector means for selectively connecting said first control signal or said second control signal to said velocity controlling means.
Claim 3
Dependent Claim
39 words
Apparatus as claimed in claim 1, wherein said rotational velocity measuring means comprises a generator which is coupled to the head wheel and supplies a signal the frequency of which is proportional to the speed of the head wheel.
Claim 4
Dependent Claim
25 words
Apparatus as claimed in claim 1, wherein said means for connecting said second vertical synchronization signal to said phase measuring means comprises a delay element.
Claim 5
Dependent Claim
304 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, first detector means connected to said velocity measuring means and to said first vertical synchronization signal for providing a first control signal, means for receiving a second vertical synchronization signal read from said tape during play back, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, a third detector means connected to said means for receiving said first vertical synchronization signal and to said second vertical synchronization signals read from said tape for providing a third control signal and switch means responsive to said third control signal of said third detector and to a second control signal of said first detector for connecting said first control signal or said second control signal to said velocity controlling means.
Claim 6
Dependent Claim
304 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, first detector means connected to said velocity measuring means and to said first vertical synchronization signal for providing a first control signal, means for receiving a second vertical synchronization signal read from said tape during play back, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, a third detector means connected to said means for receiving said first vertical synchronization signal and to said second vertical synchronization signals read from said tape for providing a third control signal and switch means responsive to said third control signal of said third detector and to a second control signal of said first detector for connecting said first control signal or said second control signal to said velocity controlling means.
Claim 7
Dependent Claim
264 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, means for receiving a second vertical synchronization signal read from said tape during play back, first detector means connected to said vertical synchronization signal and connected to said velocity measuring means for providing a first control signal, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical sycnhronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, and switch means responsive to a second control signal of said first detector means for selectively connecting said first control signal or said second control signal to said velocity controlling means.
Claim 8
Dependent Claim
264 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, means for receiving a second vertical synchronization signal read from said tape during play back, first detector means connected to said vertical synchronization signal and connected to said velocity measuring means for providing a first control signal, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, means for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical sycnhronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, and switch means responsive to a second control signal of said first detector means for selectively connecting said first control signal or said second control signal to said velocity controlling means.
Claim 9
Dependent Claim
306 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, means for receiving a second vertical synchronization signal read from said tape during playback, first detector means connected to said first vertical synchronization signal and connected to said velocity measuring means for providing a first control signal, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, a delay device for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, a third detector means connected to said means for receiving said first vertical synchronization signal and to said second vertical synchronization signals read from said tape for providing a third control signal, and switch means responsive to said third control signal of said third detector and to a second control signal of said first detector for connecting said first control signal or said second control signal to said velocity controlling means.
Claim 10
Dependent Claim
306 words
Apparatus for recording and for playing back video signals from a tape-shaped record carrier, comprising a head wheel for recording and playing back the video signals, means for measuring the rotational velocity of the head wheel, means for receiving a first vertical synchronization signal, means for receiving a second vertical synchronization signal read from said tape during playback, first detector means connected to said first vertical synchronization signal and connected to said velocity measuring means for providing a first control signal, phase measuring means for providing an output signal corresponding to the phase difference between two input signals, a delay device for connecting the first vertical synchronization signal to one of the two inputs of said phase measuring means, means connecting the second input of the phase measuring means to the rotational velocity measuring means during recording and to said means for receiving said second vertical synchronization signals during playback, a signal controlled oscillator connected to said phase measuring means for providing horizontal reference signals having a frequency controlled by the output of said phase measuring means, terminal means for providing horizontal synchronization signals read from said tape during play back and for providing horizontal synchronization signals derived from said velocity measuring means during recording, a second detector means connected to said terminal means and to said signal controlled oscillator for providing a second control signal, means for controlling the velocity of said head wheel, a third detector means connected to said means for receiving said first vertical synchronization signal and to said second vertical synchronization signals read from said tape for providing a third control signal, and switch means responsive to said third control signal of said third detector and to a second control signal of said first detector for connecting said first control signal or said second control signal to said velocity controlling means.
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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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |