Apparatus and method for mixing video signals for simultaneous presentation
DCFirst Claim
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1. An apparatus for combining two video signals comprising:
- a first input for receiving a first video signal having a first amplitude;
a second for receiving a second video signal having a second amplitude;
proportioning means connected to said first and second inputs, said proportioning means for algebraically adding a fixed portion of said first amplitude with a fixed portion of said second amplitude to give a composite amplitude, said fixed portions of said first and second amplitudes being inversely proportional to one another; and
output means connected to said proportioning means for providing said composite amplitude for video display.
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Abstract
An apparatus and its method having a first input for receiving a video signal, and a second input for receiving a computer generated graphics signal. A proportioning circuit is included which algebraically adds a portion of the signal from one input, and an inversely proportional portion of the signal from the other input. The algebraically added signal portions are provided for video display. The apparatus may include a voltage limiting circuit for limiting the combined voltage of the added signal portions to less than a set level.
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Citations
14 Claims
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1. An apparatus for combining two video signals comprising:
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a first input for receiving a first video signal having a first amplitude; a second for receiving a second video signal having a second amplitude; proportioning means connected to said first and second inputs, said proportioning means for algebraically adding a fixed portion of said first amplitude with a fixed portion of said second amplitude to give a composite amplitude, said fixed portions of said first and second amplitudes being inversely proportional to one another; and output means connected to said proportioning means for providing said composite amplitude for video display. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for combining two video signals comprising:
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receiving a first video signal having a first amplitude; receiving a second video signal having a second amplitude; algebraically adding a fixed portion of said first amplitude with a fixed portion of said second amplitude giving a composite amplitude, said fixed portions of said first and second amplitudes being inversely proportional to one another; and providing said composite amplitude for video display. - View Dependent Claims (8, 9, 10)
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11. An apparatus for combining two video signals comprising:
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a video signal input for receiving a video signal; demodulator means connected to said video signal input for demodulating the received video signal into its intensity amplitude color components; a computer graphics signal input for receiving a computer graphics signal in its intensity amplitude color components; and proportioning means connected between said demodulator means and said computer graphics signal input, said proportioning means having a plurality of mixer circuits, each mixer circuit for mixing a color component of the received video signal with a corresponding color component of the received computer graphics signal; each of said mixer circuits including means for algebraically adding a fixed portion of the intensity amplitude of one color component of the received video signal with a fixed portion of the intensity amplitude of a corresponding color component of the received computer graphics signal to give a corresponding composite intensity amplitude, said fixed portions of the intensity amplitudes of corresponding color components of said video signal and said computer graphics signal being inversely proportional to one another; and output means connected to each mixer circuit for providing said composite intensity components for video display. - View Dependent Claims (12, 13, 14)
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Specification