US4644387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plural input television receiver having peaking circuit and chrominance band reject filter in a video signal channel
Assignee: RCA Licensing Corp
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Filing: 1985-04-25
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Granted: 1987-02-17
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Expires: 2005-04-25
Abstract
Abstract A television receiver responsive to broadcast television signals in a normal operating mode includes a video channel with high frequency peaking circuits, followed by a wideband display driver to which auxiliary R, G, B color image signals are applied in an auxiliary operating mode of the receiver. A low pass filter restricts the high frequency response of the video channel in the normal mode so that the combination of the high frequency peaking circuits and the wideband display driver does not result in a condition of excessive signal bandwidth and attendant unwanted spurious high frequency signal effects.
Inventors
- 👤 Isaac M. Bell
- 👤 David E. Hollinden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:23
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/641
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
236 words
A video signal processing and display system including a video signal processing channel and an image display device responsive to video signals applied thereto, said system comprising: a first input for receiving a first video signal, comprising luminance and chrominance components, containing image information to be displayed; peaking means included in said video channel for accentuating high frequency video signal components; filter means, having a cut-off frequency below a band of frequencies occupied by said chrominance component, included in said video channel for attenuating high frequency components of a video signal subject to processing by said video channel, thereby causing said video channel to exhibit a restricted signal bandwidth; display driver amplifier means for providing an amplified video signal to a signal input of said display device, said driver means exhibiting a signal bandwidth wider than said restricted bandwidth of said video channel; a second input for receiving a second, auxiliary, video signal containing information to be displayed; and switch means for (a) enabling said first video signal from said first input to be coupled to said display device via said filter means, said peaking means and said driver means in a normal operating mode of said system; and (b) enabling said auxiliary video signal from said second input to be coupled to said display device via said driver means exclusive of said filter means and said peaking means in auxiliary operating mode of said system.
Claim 2
Dependent Claim
236 words
A video signal processing and display system including a video signal processing channel and an image display device responsive to video signals applied thereto, said system comprising: a first input for receiving a first video signal, comprising luminance and chrominance components, containing image information to be displayed; peaking means included in said video channel for accentuating high frequency video signal components; filter means, having a cut-off frequency below a band of frequencies occupied by said chrominance component, included in said video channel for attenuating high frequency components of a video signal subject to processing by said video channel, thereby causing said video channel to exhibit a restricted signal bandwidth; display driver amplifier means for providing an amplified video signal to a signal input of said display device, said driver means exhibiting a signal bandwidth wider than said restricted bandwidth of said video channel; a second input for receiving a second, auxiliary, video signal containing information to be displayed; and switch means for (a) enabling said first video signal from said first input to be coupled to said display device via said filter means, said peaking means and said driver means in a normal operating mode of said system; and (b) enabling said auxiliary video signal from said second input to be coupled to said display device via said driver means exclusive of said filter means and said peaking means in auxiliary operating mode of said system.
Claim 3
Dependent Claim
15 words
A system according to claim 1, wherein said filter means in a low pass filter.
Claim 4
Dependent Claim
22 words
A system according to claim 1, wherein said first video signal is a luminance signal subject to processing by said video channel.
Claim 5
Dependent Claim
18 words
A system according to claim 1, wherein said filter means precedes said peaking means in said video channel.
Claim 6
Dependent Claim
18 words
A receiver according to claim 4, wherein, said filter means precedes said peaking means in said video channel.
Claim 7
Dependent Claim
258 words
A television receiver including a video signal processing channel and an image display device responsive to video signals applied thereto, said receiver comprising: a first input for receiving a first video signal, comprising luminance and chrominance components, containing image information to be displayed and image synchronizing signal components; filter means, having a cut-off frequency below a band of frequencies occupied by said chrominance component, included in said video channel for attenuating high frequency components of a video signal subject to processing by said video channel, thereby causing said video channel to exhibit a restricted signal bandwidth; synchronizing signal separator means responsive to a filtered video signal for said filter means; display driver amplifier means for providing an amplified video signal to a signal input of said display device, said driver means exhibiting a signal bandwidth wider than said restricted bandwidth of said video channel; a second input for receiving a second, auxiliary, video signal containing information to be displayed; a third input for receiving image synchronizing signals for synchronizing the display of images associated with said auxiliary video signal; and switch means for (a) enabling said first video signal from said first input to be coupled to said display device via said filter means, said peaking means and said driver means in a normal operating mode of said receiver; and (b) enabling said auxiliary video signal from said second input to be coupled to said display device via said driver means exclusive of said filter means and said peaking means in an auxiliary operating mode of said receiver.
Claim 8
Dependent Claim
258 words
A television receiver including a video signal processing channel and an image display device responsive to video signals applied thereto, said receiver comprising: a first input for receiving a first video signal, comprising luminance and chrominance components, containing image information to be displayed and image synchronizing signal components; filter means, having a cut-off frequency below a band of frequencies occupied by said chrominance component, included in said video channel for attenuating high frequency components of a video signal subject to processing by said video channel, thereby causing said video channel to exhibit a restricted signal bandwidth; synchronizing signal separator means responsive to a filtered video signal for said filter means; display driver amplifier means for providing an amplified video signal to a signal input of said display device, said driver means exhibiting a signal bandwidth wider than said restricted bandwidth of said video channel; a second input for receiving a second, auxiliary, video signal containing information to be displayed; a third input for receiving image synchronizing signals for synchronizing the display of images associated with said auxiliary video signal; and switch means for (a) enabling said first video signal from said first input to be coupled to said display device via said filter means, said peaking means and said driver means in a normal operating mode of said receiver; and (b) enabling said auxiliary video signal from said second input to be coupled to said display device via said driver means exclusive of said filter means and said peaking means in an auxiliary operating mode of said receiver.
Claim 9
Dependent Claim
30 words
A receiver according to claim 6, wherein said filter means is a low-pass filter; and said first video signal is a luminance signal subject to processing by said video channel.
Claim 10
Dependent Claim
32 words
A receiver according to claim 6, wherein said switch means enables said image synchronizing signals associated with said third input to be filtered by said filter means in said auxiliary operating mode.
Claim 11
Dependent Claim
24 words
A receiver according to claim 6, wherein said first video signal of said first input is a broadcast television signal received by said receiver.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |