Video controller for displaying computer generated images on a t

Details Video controller for displaying computer generated images on a t Video controller for displaying computer generated images on a t

1996-12-03

1998-01-27

Lee, Michael H.

Television

Synchronization

Locking of computer to video timebase

H04N 9475

Patent

active

057126887

ABSTRACT:
In a graphics card of a computer, a circuit is provided for displaying graphic presentations generated by the card on an external TV set. A TV adapter controls a horizontal state machine of a CRT controller so as to delay generation of CRT timing signals by a time period variable with horizontal lines. As a result, a composite video signal is provided with a time-base variable front porch to simulate VTR video signals. In response to the generated composite video signal, the TV set switches into a VTR mode to disable a comb filter used for separating luminance and chrominance components of a broadcast television signal.

REFERENCES:
patent: 4599647 (1986-07-01), Funai
patent: 4670785 (1987-06-01), Medin
patent: 4994912 (1991-02-01), Lumelsky et al.
patent: 5192999 (1993-03-01), Graczyk et al.
patent: 5202669 (1993-04-01), Ishimochi et al.
patent: 5283819 (1994-02-01), Glick et al.
patent: 5526055 (1996-06-01), Zhang et al.

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