Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-04-04
1992-12-29
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358181, 358182, 364602, H04N 5262
Patent
active
051756234
ABSTRACT:
In a linear video mixer, two video signals are combined into a single output signal in response to any n bit byte digital control signal, the mixer having a buffered isolation input, a series of n electrically controlled double-throw type switches, each of whose control input is connected to a corresponding bit of the desired digital control signal; the two inputs of each switch are connected to one of the two respective buffered video signals to be mixed, and the output of each switch is connected to respective rungs of a 2R/R resistor ladder network that itself is connected to a buffer having relatively high output impedance; the most significant bit down to the least significant bit of the digital control word is connected to the switches in the switch-ladder network to achieve the desired output, which in combination with the resistor ladder network, will achieve the desired combination of input video signals.
REFERENCES:
patent: 3530234 (1970-09-01), Fenton
patent: 3728479 (1973-04-01), Srinivasan
patent: 3772502 (1973-11-01), Hodge et al.
patent: 4403245 (1983-09-01), Wischermann
patent: 5027213 (1991-06-01), Kamin
Clark Bruce J.
Groody James J.
Murrell Jeffrey S.
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