System and method for combining multiple composite video signals

Details System and method for combining multiple composite video signals System and method for combining multiple composite video signals

1991-10-23

1993-07-20

Peng, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358181, 358 22, H04N 5262, H04N 5268

Patent

active

052298558

ABSTRACT:
A video merging system includes apparatus for decoding incoming composite video signals into their constituent components, a memory for storing a signals temporarily to synchronize such signals with an output device, and a multiplexor for combining the synchronized signals for application to the output device. An analogue to digital converter (ADC) is arranged to convert incoming composite video signals into digital form, a digital memory is arranged to receive the digital output of the ADC, and a decoder is provided to sample the contents of this memory under the control of timing signals synchronized with the output device to develop synchronized digital samples relating to the incoming composite video signals. These digital samples are then transferred to the multiplexor to enable the multiplexor to develop a single output data stream. This system requires less memory space than needed by prior art systems and enables high quality color representations such as 24 bit RGB to be developed without increasing the memory requirement of the system.

REFERENCES:
patent: 4862269 (1989-08-01), Sonoda et al.
patent: 4914509 (1990-04-01), Idei
patent: 5065243 (1991-11-01), Katapiri

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