US4939577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver and demodulation circuit suitable for said receiver
Assignee: US Philips Corp
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Filing: 1989-03-21
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Granted: 1990-07-03
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Expires: 2009-03-21
Abstract
Abstract In a receiver for television signals which are frequency-modulated on a carrier, having a demodulation circuit provided with a frequency demodulator (19), a detector (29, 35) with a level detector (29) for detecting a disturbed television signal and a correction circuit (5, 9, 11; 53, 59, 49; 39) for correcting the disturbed television signal, the correction circuit has a control signal input (33, 37) which is coupled to an output (31) of the detector (29, 35), an input (27) of the level detector (29) for detecting interference pulses in a demodulated television signal being coupled to an output (21) of the frequency demodulator (19), and the correction circuit (5, 9, 11; 53, 59, 49; 39) including a delay circuit (53, 59, 49).
Inventors
- 👤 Louis P. M. Schreurs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:36
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/345; H04; H04N; H04N5/00; H04N5/44; H04N5/455
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
A receiver for television signals which are frequency-modulated on a carrier, said receiver comprising a demodulation circuit provided with a frequency demodulator, a detector with a level detector for detecting a disturbed television signal, and a correction circuit for correcting the disturbed television signal, said correction circuit having a control signal input coupled to an output of the detector, characterized in that an input of the level detector for detecting interference pulses in a demodulated television signal is coupled to an output of the frequency demodulator, the correction circuit comprising a delay circuit.
Claim 2
Dependent Claim
93 words
A receiver for television signals which are frequency-modulated on a carrier, said receiver comprising a demodulation circuit provided with a frequency demodulator, a detector with a level detector for detecting a disturbed television signal, and a correction circuit for correcting the disturbed television signal, said correction circuit having a control signal input coupled to an output of the detector, characterized in that an input of the level detector for detecting interference pulses in a demodulated television signal is coupled to an output of the frequency demodulator, the correction circuit comprising a delay circuit.
Claim 3
Dependent Claim
54 words
A receiver as claimed in claim 1, characterized in that the detector further comprises an interference pulse counter and in that the correction circuit further comprises means for limiting the bandwidth of the disturbed television signal and means for switching on the delay circuit in dependence upon a position of the interference pulse counter.
Claim 4
Dependent Claim
38 words
A receiver as claimed in claim 1 or 2, characterized in that the delay circuit is supplied corresponding parts of a previous line of the television signal instead of disturbed parts of a line of the television signal.
Claim 5
Dependent Claim
77 words
A receiver as claimed in claim 3, characterized in that the delay circuit comprises a change-over switch having a first television signal input for receiving a television signal which is delayed over one line period of the television signal and a second television signal input for receiving a television signal which is delayed over two line periods of the television signal, the correction circuit having a control signal input for receiving a television transmission standard information signal.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |