Television – Image signal processing circuitry specific to television – Special effects
Patent
1995-03-24
1997-01-28
Harvey, David E.
Television
Image signal processing circuitry specific to television
Special effects
348600, 348564, 348569, 348468, H04N 976
Patent
active
055982247
ABSTRACT:
A superimposing circuit includes an N-bit transmission gate for transmitting N-bit RGB data in a pixel unit in response to a blanking signal; a signal synthesizer for generating R, G and B signals, by separating each component of R, G and B from the N-1 least significant bits of the N-bit RGB data output from the transmission gate; an RGB matrix for receiving the R, G and B signals and generating a luminance signal, first and second color difference signals; a luminance signal amplifier for amplifying the luminance signal; a pair of modulators for modulating the first and second color difference signals, respectively; a first mixer for synthesizing the modulated color difference signal and generating a carrier color signal; a second mixer for synthesizing the carrier color signal, the amplified luminance signal and a complex synchronizing signal and generating a complex image signal; an attenuator for attenuating an external image signal; an image signal selector for selectively outputting the attenuated external image signal or the complex image signal according to the most significant bit value of the N-bit RGB data; and an output amplifier for amplifying the selected image signal. Therefore, the internal and external image signals can be superimposed at high speed in a pixel unit.
REFERENCES:
patent: 4532540 (1985-07-01), Wine
patent: 4639765 (1987-01-01), D'Hont
patent: 5051817 (1991-09-01), Takano
Harvey David E.
Samsung Electronics Co,. Ltd.
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