US4607284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movement-adaptive transversal-recursive noise suppression circuit for a television signal
Assignee: US Philips Corp
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Filing: 1984-05-09
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Granted: 1986-08-19
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Expires: 2004-05-09
Abstract
Abstract A movement-adaptive transversal-recursive noise suppression circuit for a television signal can be provided in a simple way with only a single control system (19) for changing from transversal to recursive filtering while maintaining optimum noise suppression. The circuit includes a first combining circuit having a first input for receiving the television signal, a delay circuit coupled to an output of the first combining circuit and a second combining circuit having a first input coupled to an output of the delay circuit and a second input coupled to the output of the first combining circuit, the output of the delay circuit being also coupled to a second input of the first combining circuit, and an output of the second combining circuit being the output of the noise suppression circuit.
Inventors
- 👤 Johannes G. Raven
- 👤 Marcellinus J. J. C. Annegarn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:04
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A movement-adaptive transversal-recursive noise suppression circuit for a television signal, comprising: a first combining circuit having a first input, constituting an input of the noise suppression circuit, a second input, and an output, a delay circuit having an input coupled to the output of said first combining circuit, and an output coupled to the second input of said first combining circuit; and a second combining circuit having a first input also coupled to the output of said delay circuit, and a second input coupled to the output of said first combining circuit, an output of said second combining circuit constituting an output of said noise suppression circuit; whereby a signal path from the output of said first combining circuit to the output of said second combining circuit via the second input thereof has a movement information-independent transfer factor.
Claim 2
Dependent Claim
138 words
A movement-adaptive transversal-recursive noise suppression circuit for a television signal, comprising: a first combining circuit having a first input, constituting an input of the noise suppression circuit, a second input, and an output, a delay circuit having an input coupled to the output of said first combining circuit, and an output coupled to the second input of said first combining circuit; and a second combining circuit having a first input also coupled to the output of said delay circuit, and a second input coupled to the output of said first combining circuit, an output of said second combining circuit constituting an output of said noise suppression circuit; whereby a signal path from the output of said first combining circuit to the output of said second combining circuit via the second input thereof has a movement information-independent transfer factor.
Claim 3
Dependent Claim
48 words
A movement-adaptive transversal-recursive noise suppression circuit as claimed in claim 1, characterized in that the signal path from the output of the first combining circuit, via the first input of the second combining circuit, to the output of the second combining circuit has a movement information-independent transfer factor.
Claim 4
Dependent Claim
38 words
A movement-adaptive transversal-recursive noise suppression circuit as claimed in claim 1, characterized in that the second combining circuit has a third input which is coupled to the output of the first combining circuit via a further delay circuit.
Claim 5
Dependent Claim
78 words
A movement-adaptive-transversal-recursive noise suppression circuit as claimed in claim 3, characterized in that the second combining circuit comprises a subtracting circuit, the inputs of which are coupled to the first and third inputs of the second combining circuit and the output of which is coupled, via a movement information-dependent transfer circuit, to an input of an adder circuit of which two further inputs are coupled to the first and the second inputs, respectively of the second combining circuit.
Claim 6
Dependent Claim
38 words
A movement-adaptive transversal-recursive noise suppression circuit as claimed in claim 2, characterized in that the second combining circuit has a third input which is coupled to the output of the first combining circuit via a further delay circuit.
Claim 7
Dependent Claim
78 words
A movement-adaptive-transversal-recursive noise suppression circuit as claimed in claim 3, characterized in that the second combining circuit comprises a subtracting circuit the inputs of which are coupled to the first and third inputs of the second combining circuit and the output of which is coupled via a movement information-dependent transfer circuit to an input of an adder circuit of which two further inputs are coupled to the first and the second inputs, respectively of the second combining circuit.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |