Patent US5428398A successfully refreshed from Google Patents.
US5428398A
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US
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Method and apparatus for producing from a standard-bandwidth television signal a signal which when reproduced provides a high-definition-like video image relatively free of artifacts
Assignee: Faroudja Laboratories Inc
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Filing: 1992-04-10
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Granted: 1995-06-27
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Expires: 2012-04-10
Abstract
Abstract Television signal processing apparatus act on a received standard-bandwidth television signal to produce a high-definition-like video image relatively free of artifacts. A motion-adaptive line doubler operates in combination with a non-linear enhancer. In a practical implementation, the combination further includes a digital decoder. When the output of the decoder is applied to the line doubler, an interface provides a transition from the time base of the decoder to the time base of the line doubler. The non-linear enhancer includes bandwidth expanding enhancement for horizontal and/or vertical picture transitions.
Inventors
- 👤 Yves C. Faroudja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:45
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/646; H04N5/00; H04N5/14; H04N5/20; H04N5/205; H04N5/208; H04N7/00; H04N7/01; H04N7/0117; H04N7/012
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
151 words
Apparatus for processing a composite television signal comprising means for decoding the composite television signal to provide a component television signal, means for motion-adaptively line doubling the component television signal, means for enhancing either the line doubled television signal or the component television signal, said means for enhancing including means for spectrally expanding the television signal in at least one of the horizontal and vertical dimensions, and means for interfacing said means for decoding the composite television signal and said means for motion-adaptively line doubling, said means for decoding having a clock frequency derived from the color subcarrier frequency of the composite television signal and said means for line doubling having a clock frequency derived from the horizontal line frequency of the component television signal, said means for interfacing providing a transition from the clock frequency of the means for decoding to the clock frequency of the means for line doubling.
Claim 2
Dependent Claim
151 words
Apparatus for processing a composite television signal comprising means for decoding the composite television signal to provide a component television signal, means for motion-adaptively line doubling the component television signal, means for enhancing either the line doubled television signal or the component television signal, said means for enhancing including means for spectrally expanding the television signal in at least one of the horizontal and vertical dimensions, and means for interfacing said means for decoding the composite television signal and said means for motion-adaptively line doubling, said means for decoding having a clock frequency derived from the color subcarrier frequency of the composite television signal and said means for line doubling having a clock frequency derived from the horizontal line frequency of the component television signal, said means for interfacing providing a transition from the clock frequency of the means for decoding to the clock frequency of the means for line doubling.
Claim 3
Dependent Claim
27 words
Apparatus according to claim 1 wherein the television signal is processed by said means for motion-adaptively line doubling before it is processed by said means for enhancing.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 wherein the television signal is processed by said means for enhancing before it is processed by said means for motion-adaptively line doubling.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 1 wherein said means for interfacing includes means for processing at least partly in the analog domain, said means including digital-to-analog converters, low-pass filters and analog-to-digital converters.
Claim 6
Dependent Claim
48 words
Apparatus according to claim 1 wherein said means for interfacing includes means for processing an applied television signal in the digital domain, said processing means including buffer means having an input clock derived from said color subcarrier frequency and an output clock derived from said horizontal line frequency.
Claim 7
Dependent Claim
36 words
Apparatus according to claim 1 wherein said component television signal has chrominance and luminance components and said means for enhancing includes means for enhancing transitions in the chrominance signal components by using the luminance signal components.
Claim 8
Dependent Claim
22 words
Apparatus according to claim 1 wherein said means for spectrally expanding the television signal spectrally expands the signal in the vertical domain.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 1 wherein said means for spectrally expanding the television signal spectrally expands the signal in the horizontal domain.
Claim 10
Dependent Claim
28 words
Apparatus according to claim 7 or 8 wherein said means for motion-adaptively line doubling the television signal includes means for interlacing and processing line-doubled television signal scan lines.
Claim 11
Dependent Claim
67 words
Apparatus according to claim 9 wherein said means for processing line-doubled television signal scan lines includes means for generating video data by linear interpolation between the input video data of the two scanning lines spatially adjacent to the corresponding output line-doubled scan line, such interpolation being performed according to coefficients proportional to the distance between the output line-doubled scan line and the two input video scanning lines.
Claim 12
Dependent Claim
22 words
Apparatus according to claim 10 wherein said coefficients are 1/4 and 3/4, and where said coefficients are interchanged on a field-to-field basis.
Claim 13
Dependent Claim
74 words
Apparatus according to claim 9 wherein said means for interlacing and processing line-doubled television signal scan lines includes means for generating an odd number of lines per two field sequence, said means including buffer means having an input clock frequency and an output clock frequency, wherein the relationship between the output clock frequency and the input clock frequency is ##EQU2## where n is the number of lines per frame of the input video standard.
Claim 14
Dependent Claim
7 words
Apparatus according to claim 12 where n=525.
Claim 15
Dependent Claim
7 words
Apparatus according to claim 12 where n=625.
Claim 16
Dependent Claim
36 words
Apparatus according to claim 12 wherein said input clock is derived from the horizontal line frequency of the applied television signal and the output clock is derived from a frequency source independent of the television signal.
Claim 17
Dependent Claim
21 words
Apparatus according to claim 15 wherein the time base of the output clock is derived from a highly stable frequency source.
Claim 18
Dependent Claim
53 words
Apparatus according to claim 42 wherein said means for interfacing includes means for processing an applied television signal in the digital and analog domains, said processing means including digital-to-analog converter means having a clock derived from said color subcarrier frequency and analog-to-digital converter means having a clock derived from said horizontal line frequency.
Claim 19
Independent Claim
121 words
A method for processing a composite television signal comprising decoding the composite television signal to provide a component television signal, motion-adaptively line doubling the component television signal, enhancing either the line doubled television signal or the component television signal, said enhancing including spectrally expanding the television signal in at least one of the horizontal and vertical dimensions, and interfacing said decoding and said motion-adaptively line doubling, said decoding having a clock frequency derived from the color subcarrier frequency of the composite television signal and said line doubling having a clock frequency derived from the horizontal line frequency of the component television signal, said interfacing providing a transition from the clock frequency of decoding to the clock frequency of the line doubling.
Claim 20
Independent Claim
121 words
A method for processing a composite television signal comprising decoding the composite television signal to provide a component television signal, motion-adaptively line doubling the component television signal, enhancing either the line doubled television signal or the component television signal, said enhancing including spectrally expanding the television signal in at least one of the horizontal and vertical dimensions, and interfacing said decoding and said motion-adaptively line doubling, said decoding having a clock frequency derived from the color subcarrier frequency of the composite television signal and said line doubling having a clock frequency derived from the horizontal line frequency of the component television signal, said interfacing providing a transition from the clock frequency of decoding to the clock frequency of the line doubling.
Claim 21
Dependent Claim
18 words
A method according to claim 18 wherein the television signal is motion-adaptively line doubled before it is enhanced.
Claim 22
Dependent Claim
18 words
A method according to claim 18 wherein the television signal is enhanced before it is motion-adaptively line doubled.
Claim 23
Dependent Claim
27 words
A method according to claim 18 wherein said interfacing processes at least partly in the analog domain, said processing including digital-to-analog converting, low-pass filtering and analog-to-digital converting.
Claim 24
Dependent Claim
41 words
A method according to claim 18 wherein interfacing processes an applied television signal in the digital domain, said processing including buffering with an input clock derived from said color subcarrier frequency and an output clock derived from said horizontal line frequency.
Claim 25
Dependent Claim
32 words
A method according to claim 18 wherein said component television signal has chrominance and luminance components and enhancing includes enhancing transitions in the chrominance signal components by using the luminance signal components.
Claim 26
Dependent Claim
20 words
A method according to claim 18 wherein spectrally expanding the television signal spectrally expands the signal in the vertical domain.
Claim 27
Dependent Claim
20 words
A method according to claim 18 wherein spectrally expanding the television signal spectrally expands the signal in the horizontal domain.
Claim 28
Dependent Claim
24 words
A method according to claim 24 or 25 wherein motion-adaptively line doubling the television signal includes interlacing and processing line-doubled television signal scan lines.
Claim 29
Dependent Claim
63 words
A method according to claim 26 wherein processing line-doubled television signal scan lines includes generating video data by linear interpolation between the input video data of the two scanning lines spatially adjacent to the corresponding output line-doubled scan line, such interpolation being performed according to coefficients proportional to the distance between the output line-doubled scan line and the two input video scanning lines.
Claim 30
Dependent Claim
23 words
A method according to claim 27 wherein said coefficients are 1/4 and 3/4, and where said coefficients are interchanged on a field-to-field basis.
Claim 31
Dependent Claim
68 words
A method according to claim 26 wherein said interlacing and processing line-doubled television signal scan lines includes generating an odd number of lines per two field sequence, including buffering with an input clock frequency and an output clock frequency, wherein the relationship between the output clock frequency and the input clock frequency is ##EQU3## where n is the number of lines per frame of the input video standard.
Claim 32
Dependent Claim
8 words
A method according to claim 29 where n=525.
Claim 33
Dependent Claim
8 words
A method according to claim 29 where n=625.
Claim 34
Dependent Claim
37 words
A method according to claim 29 wherein said input clock is derived from the horizontal line frequency of the applied television signal and the output clock is derived from a frequency source independent of the television signal.
Claim 35
Dependent Claim
22 words
A method according to claim 32 wherein the time base of the output clock is derived from a highly stable frequency source.
Claim 36
Dependent Claim
46 words
A method according to claim 18 wherein said interfacing processes an applied television signal in the digital and analog domains, said processing including digital-to-analog converting with a clock derived from said color subcarrier frequency and analog-to-digital converting with a clock derived from said horizontal line frequency.
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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) | 1998-06-26 | 1998-12-26 | 1999-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-26 | 2002-12-26 | 2003-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-26 | 2006-12-26 | 2007-06-27 | $7700.00 | Window Closed / Lapsed |