US4051526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television system comprising a video storage device and a television receiver
Assignee: US Philips Corp
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Filing: 1975-07-03
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Granted: 1977-09-27
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Expires: 1995-07-03
Abstract
Abstract A television system comprising a video tape recorder or the like and a television receiver, in which system the television signal contains an identification signal by which it is distinguished from the television signal received from a transmitter. The television receiver includes a circuit arrangement for recognizing the identification signal and for changing over circuits in the receiver, in particular for changing over the time constant network of the flywheel filter of the line synchronizing circuit. The identification signal can encode the line synchronizing pulses, for example by a serration formed therein.
Inventors
- 👤 Wolfgang Otto Gotthard Steinkopf
- 👤 Rudolf Drabek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:54
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/765; H04N5/775; H04N5/44; H04N5/445
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A television receiver for use with both a standard television signal and a recorded television signal from a player that adds an identification signal, said receiver comprising a switchable circuit, means for recognizing said identification signal, and means for switching said switchable circuit in response to said reconizing means when said recognizing means recognizes said identification signal.
Claim 2
Dependent Claim
57 words
A television receiver for use with both a standard television signal and a recorded television signal from a player that adds an identification signal, said receiver comprising a switchable circuit, means for recognizing said identification signal, and means for switching said switchable circuit in response to said reconizing means when said recognizing means recognizes said identification signal.
Claim 3
Dependent Claim
68 words
Television receiver as claimed in claim 1, wherein said switchable circuit comprises a line synchronizing circuit including a flywheel filter having a switchable time constant network, wherein in the presence of the identification signal said switching means switches the time constant network to the same condition as in the case of non-synchronization between received line synchronizing signals and signals generated by a line synchronizing circuit of the receiver.
Claim 4
Dependent Claim
41 words
Television receiver as claimed in claim 1, further comprising an input terminal means for receiving said standard televison signal, and an input terminal means for receiving said recorded television signal, wherein the recognizing means prevents display of said standard television signal.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |