US3601536A
Expired / Lapsed
US
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System and method for developing a composite video signal
Assignee: International Business Machines Corp
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Filing: 1969-01-15
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Granted: 1971-08-24
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Expires: 1989-01-15
Abstract
Abstract A system whereby a composite video signal is developed by a vidicon camera tube which is driven off a clock track from a rotating magnetic disk. The synchronizing signals from this composite signal are removed and inverted to signals within the same amplitude range as the analog video signal, and combined with the analog video signal. This new composite video signal with inverted sync frequency modulates a carrier which is applied to a rotating disk. Upon readout, this frequency-modulated signal is demodulated and the inverted sync is removed. Conventional sync time replaces the inverted sync.
Inventors
- 👤 Richard W Calfee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:28
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/92
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
A method of developing composite video signals requiring a relatively narrow bandwidth, said method including the steps of: generating an analog video signal having an information portion disposed within a predetermined amplitude range, generating synchronizing signals disposed entirely within said predetermined amplitude range to synchronize said analog video signal, developing from said analog video signal and said synchronizing signals a composite signal which varies as a function of said analog video signal and said synchronizing signal so that both of said last mentioned signals are within the same amplitude range, and frequency modulating said developed composite signal to provide a composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, with said video signal and synchronizing signal being within the same frequency range.
Claim 2
Independent Claim
133 words
A method of developing composite video signals requiring a relatively narrow bandwidth, said method including the steps of: generating an analog video signal having an information portion disposed within a predetermined amplitude range, generating synchronizing signals disposed entirely within said predetermined amplitude range to synchronize said analog video signal, developing from said analog video signal and said synchronizing signals a composite signal which varies as a function of said analog video signal and said synchronizing signal so that both of said last mentioned signals are within the same amplitude range, and frequency modulating said developed composite signal to provide a composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, with said video signal and synchronizing signal being within the same frequency range.
Claim 3
Dependent Claim
80 words
A method as set forth in claim 1 including the additional steps of storing said composite signal; demodulating said frequency-modulated composite signal to produce a demodulated composite video signal having an analog video signal portion that varies within a predetermined amplitude range and a synchronizing portion that varies within the same amplitude range; and converting the demodulated composite video signal into a signal having the video portion varying in one amplitude range and the synchronizing portion within another amplitude range.
Claim 4
Independent Claim
191 words
A system for developing a composite video signal requiring a relatively narrow bandwidth, said system comprising: a Source of conventional composite video signal, first generator means connected to said source for producing an analog video signal having an information portion which occupies a predetermined amplitude range, second generator means connected to said source for producing a synchronizing signal having an amplitude range entirely within said predetermined amplitude range of the analog video signal, combining means connected to said first and second generator means for producing a developed composite video signal which varies as a function of said analog video signal and said synchronizing signal so that said analog video and synchronizing signals are both within the same amplitude range, said developed composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, and means connected to said combining means for frequency modulating said developed composite video signal to provide a composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, said analog video and synchronizing signals being within the same frequency range.
Claim 5
Independent Claim
191 words
A system for developing a composite video signal requiring a relatively narrow bandwidth, said system comprising: a Source of conventional composite video signal, first generator means connected to said source for producing an analog video signal having an information portion which occupies a predetermined amplitude range, second generator means connected to said source for producing a synchronizing signal having an amplitude range entirely within said predetermined amplitude range of the analog video signal, combining means connected to said first and second generator means for producing a developed composite video signal which varies as a function of said analog video signal and said synchronizing signal so that said analog video and synchronizing signals are both within the same amplitude range, said developed composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, and means connected to said combining means for frequency modulating said developed composite video signal to provide a composite video signal having a frequency which varies as a function of said analog video signal and said synchronizing signal, said analog video and synchronizing signals being within the same frequency range.
Claim 6
Dependent Claim
101 words
A system as set forth in claim 3 including: means for storing said frequency-modulated composite video signal, means for reading out said frequency-modulated composite video signal from said storage means; means for demodulating said frequency-modulated composite video signal to produce a demodulated output video signal having first portions with amplitudes varying as a function of said analog video signal and second portions with amplitudes varying as a function of said synchronizing signal; and means for converting said demodulated signal to a composite video signal having its analog video information in one amplitude range and the synchronizing signal in another amplitude range.
Claim 7
Independent Claim
244 words
A system for developing a composite video signal requiring a relatively narrow bandwidth, said system comprising: a vidicon camera unit for providing a source of conventional composite video signal; a synchronizing means connected to said camera unit for driving said unit; first generator means including an amplifier, inverter and a gate, connected to said source for producing an analog video signal having an information portion disposed in a predetermined amplitude range; second generator means including an amplifier, inverter and a gate, connected to said source for producing a synchronizing signal having an amplitude range disposed entirely within said predetermined amplitude range of the analog video signal; an OR gate connected to the outputs of said first and second generator means for producing a developed composite video signal which varies as a function of the analog video signal and the synchronizing signal so that the analog video and the synchronizing signals are both within the same amplitude range; a frequency modulator connected to the output of said OR gate for frequency modulating the developed composite video signal to obtain a composite video signal having a frequency which varies as a function of the analog video signal and the synchronizing signal, which analog and synchronizing signals are within the same frequency range; and regenerating storage means including a recording head connected to the output of said frequency modulator, for recording the composite video signal with inverted synchronization on the video track of a disk-type storage medium.
Claim 8
Independent Claim
244 words
A system for developing a composite video signal requiring a relatively narrow bandwidth, said system comprising: a vidicon camera unit for providing a source of conventional composite video signal; a synchronizing means connected to said camera unit for driving said unit; first generator means including an amplifier, inverter and a gate, connected to said source for producing an analog video signal having an information portion disposed in a predetermined amplitude range; second generator means including an amplifier, inverter and a gate, connected to said source for producing a synchronizing signal having an amplitude range disposed entirely within said predetermined amplitude range of the analog video signal; an OR gate connected to the outputs of said first and second generator means for producing a developed composite video signal which varies as a function of the analog video signal and the synchronizing signal so that the analog video and the synchronizing signals are both within the same amplitude range; a frequency modulator connected to the output of said OR gate for frequency modulating the developed composite video signal to obtain a composite video signal having a frequency which varies as a function of the analog video signal and the synchronizing signal, which analog and synchronizing signals are within the same frequency range; and regenerating storage means including a recording head connected to the output of said frequency modulator, for recording the composite video signal with inverted synchronization on the video track of a disk-type storage medium.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |