Patent US4647973A successfully refreshed from Google Patents.
US4647973A
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Switch apparatus for a video interconnection system
Assignee: RCA Licensing Corp
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Filing: 1985-10-30
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Granted: 1987-03-03
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Expires: 2005-10-30
Abstract
Abstract A video component interconnection system includes a single signal conductor video bus serially coupled between each of the video components for conducting video signal between the components. A switch located in series with the video bus separates the continuity of the video bus when it is non-conductive. A shunt switch arrangement coupled to the video bus at its junction with the series switch, applies an impedance substantially equal to the characteristic impedance of the video bus between the video bus and a reference potential, when the series switch separates the continuity of the video bus, in order to reduce ghost-producing reflections.
Inventors
- 👤 Michael S. Deiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:25
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/20; H04B1/207
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
Interconnection apparatus for separate video components of a home entertainment system, comprising: a video signal conductor having a characteristic impedance for transferring a video signal produced by one of said components to at least one other of said components; a plurality of connection means associated with respective ones of said components for connecting video signal inputs and/or outputs of said components to said video signal conductor at distributed locations along said video signal conductor; first switch means having first and second ends connected in series with said video signal conductor for selectively separating said conductor into first and second segments when non-conductive; and second switch means for selectively coupling an impedance element between said video signal conductor at its junction with at least one end of said first switch means and a reference potential point when conductive so as to reduce vide signal reflections from said junction, said second switch means being conductive when said first switch means is non-conductive.
Claim 2
Dependent Claim
160 words
Interconnection apparatus for separate video components of a home entertainment system, comprising: a video signal conductor having a characteristic impedance for transferring a video signal produced by one of said components to at least one other of said components; a plurality of connection means associated with respective ones of said components for connecting video signal inputs and/or outputs of said components to said video signal conductor at distributed locations along said video signal conductor; first switch means having first and second ends connected in series with said video signal conductor for selectively separating said conductor into first and second segments when non-conductive; and second switch means for selectively coupling an impedance element between said video signal conductor at its junction with at least one end of said first switch means and a reference potential point when conductive so as to reduce vide signal reflections from said junction, said second switch means being conductive when said first switch means is non-conductive.
Claim 3
Dependent Claim
22 words
The apparatus recited in claim 1 wherein said impedance element comprises: a resistor having an impedance substantially equal to said characteristic impedance.
Claim 4
Dependent Claim
38 words
The apparatus recited in claim 2 wherein: said second switch means selectively couples first and second impedance elements in shunt with said video signal conductor at its junctions with respective ends of said first switch means when conductive.
Claim 5
Dependent Claim
43 words
The apparatus recited in claim 1 wherein: a portion of said video signal conductor, one of said connection means, said first switch means, said second switch means and said impedance element are located in a single housing associated with one of said components.
Claim 6
Dependent Claim
43 words
The apparatus recited in claim 4 wherein: said second switch means selectively couples the ends of said first and second segments of said video conductor located within said housing to said reference potential point through respective first and second impedance elements when conductive.
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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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |