US5673355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deemphasis & Subsequent reemphasis of high-energy reversed-spectrum components of a folded video signal
Assignee: Samsung Electronics Co Ltd
•
Filing: 1995-06-07
•
Granted: 1997-09-30
•
Expires: 2015-06-07
Abstract
Abstract A system for reproducing a luminance signal from a medium containing a previously recorded luminance signal with a high-frequency portion thereof compressed in dynamic range includes a circuit for recovering that luminance signal from the medium. Filtering is done to separate the low-frequency and compressed-in-dynamic-range high-frequency portions of the recovered luminance signal from each other. A corer responds to the separated compressed-in-dynamic-range high-frequency portion of the recovered luminance signal to provide a cored high-frequency portion with expanded dynamic range and reduced noise. The level of the cored high-frequency portion with expanded dynamic range and reduced noise is then boosted by a predetermined amount to compensate for energy losses during the compression of the dynamic range and added back to the low-frequency portion of the recovered luminance signal to reproduce a full-band luminance signal with at least partially restored dynamic range for high-frequencies and without readily visible high-frequency noise.
Inventors
- 👤 Christopher H. Strolle
- 👤 Allen LeRoy Limberg
- 👤 Werner F. Wedam
- 👤 Raymond Schnitzler
- 👤 Hermann J. Weckenbrock
- 👤 Jung Wan Ko
- 👤 Jong Kyung Yun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:39
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/82; H04N9/8205; H04N5/00; H04N5/76; H04N5/91; H04N5/92; H04N5/923; H04N9/797; H04N9/7976; H04N9/83; H04N9/835; H04N9/87; H04N9/898
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
156 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is increased relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for generating separated responses to the lower-frequency and upper-frequency bands of said video signal; a coring circuit for generating a cored response to the separated response to the upper-frequency band of said video signal; level-boosting means for boosting the level of said cored response by a scaling factor, thereby to generate a boosted cored response; and means for additively combining said boosted cored response with the separated response to the lower-frequency band of said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in a lower-frequency band thereof.
Claim 2
Dependent Claim
156 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is increased relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for generating separated responses to the lower-frequency and upper-frequency bands of said video signal; a coring circuit for generating a cored response to the separated response to the upper-frequency band of said video signal; level-boosting means for boosting the level of said cored response by a scaling factor, thereby to generate a boosted cored response; and means for additively combining said boosted cored response with the separated response to the lower-frequency band of said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in a lower-frequency band thereof.
Claim 3
Dependent Claim
70 words
Circuitry as set forth in claim 1, wherein said means for generating separated responses to the lower-frequency and upper-frequency bands of said video signal comprises: a highpass filter responsive to said video signal to separate said response to the upper-frequency band thereof; and a subtractor for subtracting from said video signal said response to the upper-frequency band thereof to separate said response to the lower-frequency band of said video signal.
Claim 4
Dependent Claim
74 words
Circuitry as set forth in claim 1, wherein said coring circuit is of a type that supplies an output signal proportionally responsive only to those portions of an input signal thereto which depart from an average value thereof by more than a predetermined threshold amount, either in a positive direction or in a negative direction of swing, and that otherwise supplies an output signal proportionally responsive to said average value of said input signal.
Claim 5
Dependent Claim
79 words
Circuitry as set forth in claim 1 included as reemphasis circuitry in a reproducing system for reproducing a luminance signal from a medium containing previously recorded representations of a luminance signal in folded-spectrum format, which system further includes: means for recovering from said medium said luminance signal in folded-spectrum format; and means responding to said luminance signal in folded-spectrum format for generating an unfolded luminance signal in full-spectrum format for application to said reemphasis circuitry as said video signal.
Claim 6
Dependent Claim
118 words
A reproducing system, as set forth in claim 4, wherein said coring circuit is of a type that further comprises a threshold control input terminal; that supplies an output signal proportionally responsive only to those portions of an input signal thereto which depart from an average value thereof by more than a threshold amount, either in a positive direction or in a negative direction of swing, which threshold amount varies in response to a signal received at said threshold control input terminal; and that otherwise supplies an output signal proportionally responsive to said average value of said input signal thereto; and wherein said system further comprises a user threshold input terminal coupled to said threshold control input terminal.
Claim 7
Dependent Claim
43 words
A reproducing system, as set forth in claim 4, wherein said level-boosting means comprises a multiplier for multiplying by said scaling factor said separated response to the upper-frequency band of said video signal, and wherein said scaling factor is a predetermined scaling factor.
Claim 8
Dependent Claim
50 words
A reproducing system, as set forth in claim 4, wherein said level-boosting means comprises: a multiplier for multiplying by said scaling factor said separated response to the upper-frequency band of said video signal; and a gain adjust input terminal for producing said scaling factor in response to a user input.
Claim 9
Dependent Claim
121 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is increased relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for separating said upper-frequency band of said video signal; a coring circuit for coring the separated upper-frequency band of said video signal, thereby to generate a cored response thereto; and means for additively combining said cored response with said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in said lower-frequency band thereof.
Claim 10
Dependent Claim
121 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is increased relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for separating said upper-frequency band of said video signal; a coring circuit for coring the separated upper-frequency band of said video signal, thereby to generate a cored response thereto; and means for additively combining said cored response with said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in said lower-frequency band thereof.
Claim 11
Dependent Claim
74 words
Circuitry as set forth in claim 8, wherein said coring circuit is of a type that supplies an output signal proportionally responsive only to those portions of an input signal thereto which depart from an average value thereof by more than a predetermined threshold amount, either in a positive direction or in a negative direction of swing, and that otherwise supplies an output signal proportionally responsive to said average value of said input signal.
Claim 12
Dependent Claim
78 words
Circuitry as set forth in claim 8 included as reemphasis circuitry in a system for reproducing a luminance signal from a medium containing previously recorded representations of a luminance signal in folded-spectrum format, which system further includes: means for recovering from said medium said luminance signal in folded-spectrum format; and means responding to said luminance signal in folded-spectrum format for generating an unfolded luminance signal in full-spectrum format for application to said reemphasis circuitry as said video signal.
Claim 13
Dependent Claim
118 words
A reproducing system, as set forth in claim 10, wherein said coring circuit is of a type that further comprises a threshold control input terminal; that supplies an output signal proportionally responsive only to those portions of an input signal thereto which depart from an average value thereof by more than a threshold amount, either in a positive direction or in a negative direction of swing, which threshold amount varies in response to a signal received at said threshold control input terminal; and that otherwise supplies an output signal proportionally responsive to said average value of said input signal thereto; and wherein said system further comprises a user threshold input terminal coupled to said threshold control input terminal.
Claim 14
Dependent Claim
120 words
Circuitry as set forth in claim 1, further comprising: a further coring circuit for generating a further cored response to the separated response to the upper-frequency band of said video signal; further level-boosting means for boosting the level of said further cored response by a further sealing factor, thereby to generate a further boosted cored response; and means for additively combining said further boosted cored response with said boosted cored response and the separated response to the lower-frequency band of said video signal, thereby to generate said response to said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof increased relative to components of said video signal in a lower-frequency band thereof.
Claim 15
Dependent Claim
195 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for separating said lower-frequency and upper-frequency bands of said signal; means for rectifying the separated upper-frequency band of said video signal, thereby to generate a rectified upper-frequency response; means for baseline clipping said rectified upper-frequency response for generating a control signal; means for generating a multiplier signal having an amplitude that varies in response to said control signal, growing smaller with increase in said control signal and growing larger with decrease in said control signal; means for multiplying the separated upper-frequency band of said video signal by said multiplier signal, thereby to generate a product signal; and means for additively combining said product signal with the separated lower-frequency band of said video signal, thereby to generate said response to said video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof.
Claim 16
Dependent Claim
195 words
Circuitry for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, said circuitry comprising: means for separating said lower-frequency and upper-frequency bands of said signal; means for rectifying the separated upper-frequency band of said video signal, thereby to generate a rectified upper-frequency response; means for baseline clipping said rectified upper-frequency response for generating a control signal; means for generating a multiplier signal having an amplitude that varies in response to said control signal, growing smaller with increase in said control signal and growing larger with decrease in said control signal; means for multiplying the separated upper-frequency band of said video signal by said multiplier signal, thereby to generate a product signal; and means for additively combining said product signal with the separated lower-frequency band of said video signal, thereby to generate said response to said video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof.
Claim 17
Dependent Claim
71 words
Circuitry as set forth in claim 13 for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, wherein said means for generating a multiplier signal essentially consists of: means for subtracting said control signal from a prescribed level for generating said multiplier signal.
Claim 18
Dependent Claim
245 words
Circuitry as set forth in claim 13 for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, having in cascade and at least one following cascaded element, circuitry for regenerating said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof restored to substantially their original level relative to components of said video signal in said lower-frequency band thereof, wherein said circuitry for regenerating said video signal comprises: means for separating the lower-frequency and upper-frequency bands of said response to said video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof; means for coring the separated upper-frequency band response to said video signal, thereby to generate a cored response thereto; means for boosting the level of said cored response by a scaling factor, thereby to generate a boosted cored response; and means for additively combining said boosted cored response with the separated lower-frequency band response to said video signal, thereby to regenerate said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof restored to substantially their original level relative to components of said video signal in said lower-frequency band thereof.
Claim 19
Dependent Claim
223 words
Circuitry as set forth in claim 13 for generating a response to a video signal in which the level of higher-amplitude components of said video signal in an upper-frequency band thereof is reduced relative to components of said video signal in a lower-frequency band thereof, having in cascade after it and at least one following cascaded element, circuitry for regenerating said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof restored to substantially their original level relative to components of said video signal in said lower-frequency band thereof, wherein said circuitry for regenerating said video signal comprises: means for separating the upper-frequency band of said response to said video signal in which the level of higher-amplitude components of said video signal in said upper-frequency band thereof is reduced relative to components of said video signal in said lower-frequency band thereof; means for coring the separated upper-frequency band of said response to said video signal, thereby to generate a cored response thereto; and means for additively combining said cored response with said response to said video signal, thereby to regenerate said video signal with the level of higher-amplitude components of said video signal in said upper-frequency band thereof restored to substantially their original level relative to components of said video signal in said lower-frequency band thereof.
References Cited (Backward Citations)
EP0015499A1
Cited
US4720751A
Cited
US4885631A
Cited
US4660072A
Cited
US4745460A
Cited
US4943848A
Cited
US4668988A
Cited
US4621286A
Cited
US4742386A
Cited
US4811116A
Cited
US5063457A
Cited
US4831463A
Cited
US4984093A
Cited
US4870481A
Cited
US4963991A
Cited
US4891699A
Cited
US5067009A
Cited
US5161030A
Cited
US5113262A
Cited
US5031030A
Cited
EP0484154A2
Cited
US5182642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-29 | 2001-03-31 | 2001-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-29 | 2005-03-31 | 2005-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-29 | 2009-03-31 | 2009-09-30 | $7700.00 | Window Closed / Lapsed |