Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1976-11-12
1978-02-14
Richardson, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 22, H04N 9535
Patent
active
040743098
ABSTRACT:
The red, green and blue video output of a camera, telecine channel or video tape recording is fed into a video effects unit including red, green and blue circuits, each of which are the same. Each of these color circuits includes an emitter follower feeding into a paraphase amplifier which produces inverted and non-inverted signals which are fed into an emitter follower arrangement, across which is coupled a potentiometer having a tap feeding into an amplitude mixer. Also feeding into the amplitude mixer are signals derived from an audio circuit, signals derived from a blanking circuit and signals derived from a luminance circuit. These four signals or selected of these signals are amplitude mixed and fed into a further emitter follower arrangement and thence to a buffer amplifier, whereat a clamping circuit exerts a clamping action based on clamping pulses generated from a synchronization or composite video signal. The method of the invention relates to producing special video effects by the use of color video signals and supplemental television signals and more precisely involves forming the video signals into inverted and non-inverted signals and selecting a level between the inverted and non-inverted signals for amplitude mixing with further signals derived from other signals incidental to the color video signals.
REFERENCES:
patent: 2845482 (1958-07-01), King et al.
Chroma-Flex, Inc.
Richardson Robert L.
Roberts Alan K.
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