Television – Image signal processing circuitry specific to television – Special effects
Patent
1994-01-19
1995-06-13
Groody, James J.
Television
Image signal processing circuitry specific to television
Special effects
348588, H04N 976
Patent
active
054247829
ABSTRACT:
Disclosed is a mixing circuit. A still-picture signal (S) input from a still-picture signal input terminal and a motion-picture signal (M) input from a motion-picture signal input terminal are added together by a first adder, and the resultant signal is converted to (S+M)/2 by a first 1-bit right shifter, and to (S+M)/4 by a 2-bit right shifter. One of the outputs of those shifters is selected by a first multiplexer in accordance with shift signals CI2-CI0. The still-picture signal (S) and motion-picture signal (M) are also respectively converted by a second 1-bit right shifter and a third 1-bit right shifter to S/2 and M/2, one of which or "O" is selected by a second multiplexer in accordance with the shift signals CI2-CI0. The outputs of the first and second multiplexers are added together by a second adder to be input to a third multiplexer. The output of the third multiplexer is determined by the shift signals CI2-CI0, and is output from an output terminal.
REFERENCES:
patent: 5008754 (1991-04-01), Trevett et al.
patent: 5027213 (1991-06-01), Kamin
patent: 5231498 (1993-07-01), Kawamoto
patent: 5333055 (1994-07-01), Murata et al.
Groody James J.
Murrell Jeffrey S.
NEC Corporation
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