Patent US5396293A successfully refreshed from Google Patents.
US5396293A
Expired / Lapsed
US
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Filter circuit with bandwidth varied as a function of bit error rate and luminance level
Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1994-05-02
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Granted: 1995-03-07
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Expires: 2014-05-02
Abstract
Abstract An arrangement for enhancing an image corresponding to a television signal including a digital component includes a variable bandwidth filter and a control unit for controlling the bandwidth of the filter in response to the bit error rate (BER) of the digital component of the television signal. The control unit increases the bandwidth as the BER and therefore the signal quality increases and decreases the bandwidth as the BER and therefore the signal quality decreases. In one embodiment, the control unit is responsive to both the BER and the "darkness" of the image represented by the television signal so as to restrict the bandwidth more for relatively dark areas than for relatively light areas.
Inventors
- 👤 Christopher J. Shellard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:56
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N7/00; H04N7/08; H04N9/64; H04N9/646
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
Apparatus for enhancing the quality of an image corresponding to a television signal including a digital component comprising: means responsive to said digital component of said television signal for detecting the error rate of said digital component; means responsive to said televisions signal for separating said television signal into luminance and chrominance components; means including a first filter controllable in response to a first filter control signal for producing a filtered version of said luminance component; means including a second filter controllable in response to a second filter control signal for producing a filtered version of said chrominance component; and means for generating said first and second filter control signals for said first and second filters, respectively, in response to said detected error rate of said digital component of said television signal.
Claim 2
Dependent Claim
132 words
Apparatus for enhancing the quality of an image corresponding to a television signal including a digital component comprising: means responsive to said digital component of said television signal for detecting the error rate of said digital component; means responsive to said televisions signal for separating said television signal into luminance and chrominance components; means including a first filter controllable in response to a first filter control signal for producing a filtered version of said luminance component; means including a second filter controllable in response to a second filter control signal for producing a filtered version of said chrominance component; and means for generating said first and second filter control signals for said first and second filters, respectively, in response to said detected error rate of said digital component of said television signal.
Claim 3
Dependent Claim
34 words
The apparatus recited in claim 1, wherein at least one of said first and second filters has a controllable bandwidth controlled in response to the respective one of said first and second control signals.
Claim 4
Dependent Claim
22 words
The apparatus recited in claim 1, wherein said digital component component is included in the vertical retrace interval of said television signal.
Claim 5
Dependent Claim
13 words
The apparatus recited in claim 3, wherein said digital component is teletext data.
Claim 6
Dependent Claim
13 words
The apparatus recited in claim 3, wherein said digital component is programming data.
Claim 7
Dependent Claim
13 words
The apparatus recited in claim 1, wherein said digital component represents audio information.
Claim 8
Dependent Claim
19 words
The apparatus recited in claim 1, wherein said digital component is encoded in accordance with an error detection code.
Claim 9
Dependent Claim
15 words
The apparatus recited in claim 7, wherein said error detection code is a Hamming code.
Claim 10
Dependent Claim
49 words
The apparatus recited in claim 1, wherein at least one of said first and second filters has a controllable bandwidth, and the respective one of said first and second control signals controls said bandwidth of said one filter in inverse relationship to said error rate of said digital component.
Claim 11
Dependent Claim
109 words
Apparatus for enhancing the quality of an image corresponding to a television signal including a digital component comprising: means responsive to said digital component of said television signal for detecting the error rate of said digital component; means responsive to said television signal for detecting a signal representative of the darkness of said image; means including a filter controllable in response to a control signal for producing a filtered version of said television signal; and means for generating said control signal for said filter in response to said detected error rate of said digital component of said television signal and said signal representative of the darkness of said image.
Claim 12
Dependent Claim
109 words
Apparatus for enhancing the quality of an image corresponding to a television signal including a digital component comprising: means responsive to said digital component of said television signal for detecting the error rate of said digital component; means responsive to said television signal for detecting a signal representative of the darkness of said image; means including a filter controllable in response to a control signal for producing a filtered version of said television signal; and means for generating said control signal for said filter in response to said detected error rate of said digital component of said television signal and said signal representative of the darkness of said image.
Claim 13
Dependent Claim
37 words
The apparatus recited in claim 10, wherein the bandwidth of said filter is controlled, and said control signal controls said bandwidth inverse relationship to said error rate and in inverse relationship with the darkness of said image.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
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