Analog controlled mixer

Details Analog controlled mixer Analog controlled mixer

1989-03-22

1991-04-16

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 22, 358181, H04N 5265, H04N 5272

Patent

active

050087541

ABSTRACT:
A system and method for merging two or more analog video signals under control of a third analog video signal. A standard video output from one processor's video signal digital to analog converter (DAC) is used as the control signal for the merging of two or more other video signals. This enables the video outputs of even highly diverse processing schemes to be easily merged. In its preferred embodiment, the system includes analog switching circuitry which is used to mix the video outputs from two or more different systems. The system also includes circuitry which converts the standard video output from a third processor into a large swing TTL signal which is used to control the analog switch.

REFERENCES:
patent: 4599611 (1986-07-01), Bowker et al.
patent: 4678944 (1987-07-01), Williams
patent: 4700232 (1987-10-01), Abt
patent: 4774583 (1988-09-01), Kellar
patent: 4779135 (1988-10-01), Judd
patent: 4811084 (1989-03-01), Belmares et al.
patent: 4827253 (1989-05-01), Maltz
patent: 4845565 (1989-07-01), Macheboeuf
patent: 4922345 (1990-05-01), Barton
Carlson, et al.; Electrical Engineering Concepts and Applications, Addison-Wesley Publishing Co.; Reading, MA; 1981; pp. 573-574.

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