Converter to convert a computer graphics signal to an interlaced

Details Converter to convert a computer graphics signal to an interlaced Converter to convert a computer graphics signal to an interlaced

1993-09-16

1995-10-03

Kostak, Victor R.

Television

Format conversion

Progressive to interlace

348455, H04N 701

Patent

active

054556287

ABSTRACT:
A converter receives a computer graphics signal from a PC and provides from it a video signal for display or recording. Analogue RGB signals are digitised and applied to a vertical filter and rate buffer. The rate buffer needs only one to three lines of storage capacity. The received graphics signal is a VGA 640.times.480 non-interlaced mode signal, and the rate buffer halves the line rate and produces an interlaced output. Such a signal can be treated as a video signal, after reconversion to analogue form. The vertical filter provides a degree of vertical averaging to remove flicker. In a preferred store using three line-store FIFOs, input lines are applied to them in the sequence A,B,C,B,A, and so on.

REFERENCES:
patent: 4200887 (1980-04-01), Van Den Avoort
patent: 4298888 (1981-11-01), Colles et al.
patent: 4386367 (1983-05-01), Peterson et al.
patent: 4694325 (1987-09-01), Mehrgardt
patent: 4924315 (1990-05-01), Yamashita
patent: 5019904 (1991-05-01), Campbell

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