Bus interface circuit for a multimedia system
First Claim
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1. An information handling apparatus for transferring and composing image signals for display comprising:
- a bus interface circuit adapted to allow selective access to a bus of an independent analog image signal continuously generated by an independent image source,said selective access enabling composition of said independent image signal in response to control information,said composition enabling real time display of a composed image signal representing an image to be displayed.
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Abstract
An information handling apparatus for transferring and composing image signals for display including a bus interface circuit adapted to allow selective access to a bus of an independent image signal generated by an independent image source. The selective access enables composition of the independent image signal in response to control information; the composition enables real time display of a composed image signal.
43 Citations
17 Claims
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1. An information handling apparatus for transferring and composing image signals for display comprising:
a bus interface circuit adapted to allow selective access to a bus of an independent analog image signal continuously generated by an independent image source, said selective access enabling composition of said independent image signal in response to control information, said composition enabling real time display of a composed image signal representing an image to be displayed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An information handling apparatus for transferring and composing image signals for display comprising:
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a bus interface circuit adapted to allow selective access to a bus of an independent image signal generated by an independent image source, said selective access enabling composition of said independent image signal in response to control information, said composition enabling real time display of a composed image signal, said bus interface circuit including a switch circuit configured to selectively switch said independent image signal to allow said selective access to the bus in response to switch control information and a control circuit configured to provide said switch control information to said switch based upon said control information, said control circuit including a window control circuit configured to generate said switch control information based upon said control information, said window control circuit including a comparison circuit configured to provide a window enable signal based upon said control information, said window enable signal indicating when access to said bus is allowed, said comparison circuit being configured to receive window start and window stop information, and to compare said count information to said window start and window stop information and to generate said window enable signal based upon said comparison, said window control circuit also including a timing circuit configured to receive synchronization information and to provide count information to said comparison circuit, wherein said window start information includes horizontal window start information, said window stop information includes horizontal window stop information, said count information includes horizontal count information, and said comparison circuit compares said horizontal window start information and said horizontal window stop information with said horizontal count information. - View Dependent Claims (13, 14, 15, 16)
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17. An apparatus for granting a media source access to a bus on a point by point basis, a point being related to a coordinate of a display device, the combination comprising
a bus interface circuit adapted to allow selective access to the bus of an independent analog image signal continuously generated by the media source, said selective access enabling composition of said independent image signal in response to control information, said composition enabling real time display by the display device of a composed image signal representing an image to be displayed.
Specification