Patent US4467191A successfully refreshed from Google Patents.
US4157569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television receiver having a synchronous detection circuit and a frequency deviation-detection circuit to achieve a wide frequency range control function
Assignee: US Philips Corp
•
Filing: 1977-08-18
•
Granted: 1979-06-05
•
Expires: 1997-08-18
Abstract
Abstract In a television receiver having a synchronous video signal detector from which a signal is obtained for controlling a function such as an automatic volume control or a synchronization signal separation, a correction signal, obtained by means of full-wave rectification from a frequency deviation detector, is added to the signal to improve the operation of said function of the receiver in the case of more serious detuning.
Inventors
- 👤 Hans J. Apeldoorn
- 👤 Peter J. H. Janssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:32
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/50; H03; H03G; H03G3/00; H03G3/20; H04N5/455
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
113 words
A circuit for use in a television receiver having an intermediate frequency signal, said circuit comprising a filter tuned to said intermediate frequency, a synchronous detector having an input coupled to said filter and an output, a frequency deviation detector having an input coupled to receive said intermediate frequency signal and at least one output, a rectifier having an input coupled to said deviation detector output and an output, and a combining circuit having a pair of inputs coupled to said rectifier and synchronous detector outputs respectively and an output means for supplying a function control signal to the receiver; whereby the control of said function is operative for a wide frequency range.
Claim 2
Dependent Claim
113 words
A circuit for use in a television receiver having an intermediate frequency signal, said circuit comprising a filter tuned to said intermediate frequency, a synchronous detector having an input coupled to said filter and an output, a frequency deviation detector having an input coupled to receive said intermediate frequency signal and at least one output, a rectifier having an input coupled to said deviation detector output and an output, and a combining circuit having a pair of inputs coupled to said rectifier and synchronous detector outputs respectively and an output means for supplying a function control signal to the receiver; whereby the control of said function is operative for a wide frequency range.
Claim 3
Dependent Claim
19 words
A circuit as claimed in claim 1, further comprising an automatic volume control circuit coupled to said output means.
Claim 4
Dependent Claim
19 words
A circuit as claimed in claim 1, further comprising a synchronization signal separation circuit coupled to said output means.
Claim 5
Dependent Claim
23 words
A circuit as claimed in claim 1, wherein said frequency deviation detector comprises a phase detector having an input coupled to said filter.
Claim 6
Dependent Claim
38 words
A circuit as claimed in claim 1, wherein said deviation detector comprises a pair of opposite polarity outputs and said rectifier comprises a full wave rectifier having a pair of inputs coupled to said deviation detector outputs respectively.
References Cited (Backward Citations)
US2573248A
Cited
US3562416A
Cited
US3812289A
Cited
US3858000A
Cited
US3922483A
Cited
US3962533A
Cited
US4091410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-04 | 1982-12-04 | 1983-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-04 | 1986-12-04 | 1987-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-04 | 1990-12-04 | 1991-06-05 | $7700.00 | Window Closed / Lapsed |