Special effects mixer for video signals with automatic amplitude

Details Special effects mixer for video signals with automatic amplitude Special effects mixer for video signals with automatic amplitude

1989-12-19

1991-05-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358183, H04N 5265, H04N 5262

Patent

active

050161059

ABSTRACT:
In a mixer in which several video signal inputs are multiplied by respective mixing factor signals and the multiplier outputs are added together to produce an output video signal, one of the video inputs is given priority and the mixing factors for the other video inputs are premultiplied by a second set of multipliers in such a manner that the video input of next priority will not have an amplitude greater than what is "left over" by the higher priority signal, and so on in descending order of priority. For further flexibility it is useful to provide a third set of multipliers to allow more external control inputs to participate in determining mixing factors and facilitate special effects. A multiplier of the third set is not necessary for control of the mixing factor of the video input of lowest priority. Even a multiplier of the second set is not strictly necessary for that lowest priority video input.

REFERENCES:
patent: 4668989 (1987-05-01), Machereth

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