US5438375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video switching circuit and television receiver incorporating thereof
Assignee: Panasonic Holdings Corp
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Filing: 1993-06-08
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Granted: 1995-08-01
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Expires: 2013-06-08
Abstract
Abstract A video switching circuit is capable of switching between a Y/C separated video signal and a composite video signal. The video switching circuit includes a first and a second video input terminals. The Y/C separated video signal is inputted to said first video input terminal and plural composite video signals are inputted to the second video input terminal when these two types of video signal inputs are required. The circuit is equipped with a first and a second selector. One of the plural composite video signals inputted to the second video input is selected by the first selector. The selected composite video signal is separated into luminance and chrominance signals by a Y/C separator. As a result, the output of the Y/C separator and the signal inputted by the first video input are similar. Thus, these two signals can be alternatively switched by the second selector according to the control signal given by an appropriate controller.
Inventors
- 👤 Toru Sasabe
- 👤 Emiko Sumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:12
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/641
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
217 words
A video switching circuit comprising: first video signal input means for generating a Y/C separated video signal having a luminance signal and a chrominance signal, said luminance signal and said chrominance signal separated; second video signal input means for generating a plurality of composite video signals each one of said plurality of composite video signals including a respective luminance signal and a respective chrominance signal; first selection means for selecting one of said plurality of composite video signals generated by said second video signal input means; Y/C separation means for separating said one of said plurality of composite video signals selected by said first selection means into said respective luminance signal and said respective chrominance signal to produce a separated composite signal and for providing said separated composite signal at an output; second selection means for selecting between said separated composite signal from said Y/C separation means and the Y/C separated video signal generated by said first video signal input means; and control means for generating a control signal to control said first and said second selection means; wherein said second selection means alternatively switches between said separated composite signal and said Y/C separated video signal in response to said control signal independently of said first selection means selecting one of said plurality of composite video signals.
Claim 2
Dependent Claim
217 words
A video switching circuit comprising: first video signal input means for generating a Y/C separated video signal having a luminance signal and a chrominance signal, said luminance signal and said chrominance signal separated; second video signal input means for generating a plurality of composite video signals each one of said plurality of composite video signals including a respective luminance signal and a respective chrominance signal; first selection means for selecting one of said plurality of composite video signals generated by said second video signal input means; Y/C separation means for separating said one of said plurality of composite video signals selected by said first selection means into said respective luminance signal and said respective chrominance signal to produce a separated composite signal and for providing said separated composite signal at an output; second selection means for selecting between said separated composite signal from said Y/C separation means and the Y/C separated video signal generated by said first video signal input means; and control means for generating a control signal to control said first and said second selection means; wherein said second selection means alternatively switches between said separated composite signal and said Y/C separated video signal in response to said control signal independently of said first selection means selecting one of said plurality of composite video signals.
Claim 3
Dependent Claim
67 words
A video switching circuit according to claim 1, further including: memory means for storing one of a plurality of states corresponding to each of the first and the second selection means; wherein said control means selects one of said plurality of states corresponding to said second selection means stored in said memory means when said first selection means selects a desired input for said second input means.
Claim 4
Dependent Claim
16 words
A video switching circuit according to claim 2, wherein said memory means is a non-volatile memory.
Claim 5
Dependent Claim
40 words
A video switching circuit according to claim 2, wherein one of said plurality of states corresponding to said first selection means and another one of said plurality of states corresponding to said second selection means are maintained following power interruption.
Claim 6
Dependent Claim
240 words
A television receiver including a video switching circuit and an instruction means to control said video switching circuit, said video switching circuit comprising: first video signal input means for generating a Y/C separated video signal having a luminance signal and a chrominance signal, said luminance signal and said chrominance signal being separated; second video signal input means for generating a plurality of composite video signals each one of said plurality of composite video signals including a respective luminance signal and a respective chrominance signal; first selection means for selecting one of said plurality of composite video signals generated by said second video signal input means; Y/C separation means for separating said one of said plurality of composite video signals selected by said first selection means into said respective luminance signal and said respective chrominance signal to produce a separated composite signal; second selection means for selecting between said separated composite signal from said Y/C separation means and the Y/C separated video signal generated by said first video signal input means; and control means for generating a control signal to control said first and said second selection means; wherein said second selection means alternatively switches between said separated composite signal and said Y/C separated video signal in response to said control signal independently of said first selection means selecting one of said plurality of composite video signals; and said first and said second selection means are controlled by said instruction means.
Claim 7
Dependent Claim
240 words
A television receiver including a video switching circuit and an instruction means to control said video switching circuit, said video switching circuit comprising: first video signal input means for generating a Y/C separated video signal having a luminance signal and a chrominance signal, said luminance signal and said chrominance signal being separated; second video signal input means for generating a plurality of composite video signals each one of said plurality of composite video signals including a respective luminance signal and a respective chrominance signal; first selection means for selecting one of said plurality of composite video signals generated by said second video signal input means; Y/C separation means for separating said one of said plurality of composite video signals selected by said first selection means into said respective luminance signal and said respective chrominance signal to produce a separated composite signal; second selection means for selecting between said separated composite signal from said Y/C separation means and the Y/C separated video signal generated by said first video signal input means; and control means for generating a control signal to control said first and said second selection means; wherein said second selection means alternatively switches between said separated composite signal and said Y/C separated video signal in response to said control signal independently of said first selection means selecting one of said plurality of composite video signals; and said first and said second selection means are controlled by said instruction means.
Claim 8
Dependent Claim
16 words
A television receiver according to claim 5, wherein said instruction means is a remote control device.
Claim 9
Dependent Claim
30 words
A television receiver according to claim 5, further including display means to display a selection state of said first selection means and a selection state of said second selection means.
Claim 10
Dependent Claim
36 words
A television receiver according to claim 5, wherein said video switching circuit includes a non-volatile memory in which the selection of said second selection means is stored, wherein said stored selection is read during video switching.
References Cited (Backward Citations)
EP0260861A2
Cited
US4802000A
Cited
US4937672A
Cited
US4963958A
Cited
US4996597A
Cited
US5018013A
Cited
EP0443966A1
Cited
US5032900A
Cited
EP0455131A2
Cited
JPH0464852A
Cited
JPH0470267A
Cited
JPH04108250A
Cited
US5202765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-31 | 1999-01-30 | 1999-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-31 | 2003-01-30 | 2003-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-31 | 2007-01-30 | 2007-08-01 | $7700.00 | Window Closed / Lapsed |