Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-12-19
1991-06-25
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 22, 358182, H04N 5262, H04N 5265, H04N 545
Patent
active
050272136
ABSTRACT:
In a video mixer each input video signal is modified by only a single multiplier before its contribution is added to the contributions of other input video signals to produce the output video signal. The sums of the contributions of the video signals which participate at any time in the output signal corresponds to a predetermined value for the overall amplitude range. The mixing factor signals supplied to each of the mixers which are in line with the inputs are generated by two priority cascades of subtracters, multipliers and adders, each of which provides for the composition of an output picture, up to six video input signals and a switching system permits allocating priorities between the inputs in any desired way on a permanent or variable basis. The two separate cascades of control signals are connectable through the in line multipliers in such a way that a composite output picture made up of up to 6 input video signals can be faded over to another composite input signal likewise made up of up to 6 or more input video signals, not all of which need to be different on both sides of the fade. One cascade can be used to prepare the next composite picture and additional switching make possible the preview of the next composite picture on a preview monitor before that next picture is faded in.
REFERENCES:
patent: 4668989 (1987-05-01), Mackereth
Burgess Glenton B.
Groody James J.
Robert & Bosch GmbH
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