Television – Format conversion
Patent
1997-05-30
2000-01-18
Rao, Anand S.
Television
Format conversion
348392, 348443, 348448, 348701, H04N 0701
Patent
active
060161655
ABSTRACT:
A vertical compression circuit of an image playback system displaying an image through interlaced scanning includes: a mode counter for counting horizontal lines within one section of vertical lines based on a compression mode signal and outputting a count; a coefficient selection signal generating unit for outputting a coefficient selection signal for selecting first and second filtering coefficients and for outputting a feedback control signal, based on the compression mode signal; a first coefficient selecting unit for generating first coefficients corresponding to various compression modes and outputting one of the first coefficients based on the first coefficient selection signal; a second coefficient selecting unit for generating second coefficients corresponding to various compression modes and outputting one of the second coefficients based on the second coefficient selection signal; an adder for adding the second coefficient output from the second coefficient selecting unit to one of zero and a feedback value, based on the feedback signal to produce a sum; a line memory unit for storing the output from the adder, wherein the adder outputs the second coefficient output from the second coefficient selecting unit if the feedback signal indicates no feedback, and the adder outputs the sum of the second coefficient output from the second coefficient selecting unit and a value previously stored in the line memory if the feedback signal indicates feedback; and a unit for adding the contents of the line memory unit and the output of the first coefficient selecting unit, and outputting a result.
REFERENCES:
patent: 5355328 (1994-10-01), Arbeiter et al.
patent: 5534934 (1996-07-01), Katsumata et al.
patent: 5668602 (1997-09-01), Sid-Ahmed
patent: 5734434 (1998-03-01), Kettenis
Rao Anand S.
Samsung Electronics Co,. Ltd.
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