US3962533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver
Assignee: US Philips Corp
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Filing: 1974-05-03
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Granted: 1976-06-08
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Expires: 1994-05-03
Abstract
Abstract In a television receiver using synchronous detection of the I.F. signal a picture carrier regenerator is used which is active for a small deviation of the picture intermediate frequency relative to the regenerator frequency and is passive for a large deviation so that the drawbacks of both a passive and of an active regenerator are obviated.
Inventors
- 👤 Karl Frans Nickl von Nikelsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:34
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
A television receiver including a synchronous detector coupled to an output of an I.F. section and to an output of an I.F. picture carrier regenerator, the I.F. picture carrier regenerator comprising a change-over switch for changing over from an active to a passive regeneration state of the picture carrier regenerator and conversely, a picture carrier filter coupled to said change-over switch, and an amplifier coupled between said picture carrier filter and said change-over switch, an operation signal input of said change-over switch being coupled to an output of a tuning detection circuit, said tuning detection circuit providing a signal rendering the picture carrier regenerator passive in case of a large deviation of the intermediate frequency of a received signal relative to the desired frequency and provides a signal rendering the picture carrier regenerator active in case of a small deviation.
Claim 2
Dependent Claim
140 words
A television receiver including a synchronous detector coupled to an output of an I.F. section and to an output of an I.F. picture carrier regenerator, the I.F. picture carrier regenerator comprising a change-over switch for changing over from an active to a passive regeneration state of the picture carrier regenerator and conversely, a picture carrier filter coupled to said change-over switch, and an amplifier coupled between said picture carrier filter and said change-over switch, an operation signal input of said change-over switch being coupled to an output of a tuning detection circuit, said tuning detection circuit providing a signal rendering the picture carrier regenerator passive in case of a large deviation of the intermediate frequency of a received signal relative to the desired frequency and provides a signal rendering the picture carrier regenerator active in case of a small deviation.
Claim 3
Dependent Claim
52 words
A television receiver as claimed in claim 1, wherein the tuning detection circuit comprises a phase detector which is coupled to an output of the I.F. section of the receiver, an output of said phase detector being coupled through a polarity correction circuit to the operation signal input of the changeover switch.
References Cited (Backward Citations)
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |