Character display apparatus

Details Character display apparatus Character display apparatus

1996-11-20

1999-09-28

Peng, John K.

Television

Basic receiver with additional function

For display of additional information

348564, 348581, 348582, 348600, H04N 5455, H04N 974

Patent

active

059596856

ABSTRACT:
According to this character display apparatus, a limit of a frequency band of a character display signal is removed and small characters, etc., also can be displayed satisfactorily. A sync signal from a sync separating circuit (4) is supplied to a character generating circuit (8) in which a display signal of arbitrary characters or the like is formed by RGB three primary color signals in synchronism with predetermined dot clocks. The thus formed display signal is supplied to a line memory (9) and dot clocks are supplied to the line memory (9) and thereby the display signal is written in the line memory (9). Further, dot clocks are supplied to a multiplying circuit (10) and clock multiplied with an arbitrary multiplying ratio are supplied to the line memory (9) so that the written display signal is read out from the line memory (9). The read out display signal is supplied to a superimposing circuit (5), in which it is superimposed upon the three primary color signals of video signal and supplied to a cathode-ray tube (6), thereby resulting in characters, etc., being displayed.

REFERENCES:
patent: 4180805 (1979-12-01), Burson
patent: 4595953 (1986-06-01), Willis
patent: 5436670 (1995-07-01), Tachibana
patent: 5532741 (1996-07-01), Tsutsumi
patent: 5541663 (1996-07-01), Ohno
patent: 5608425 (1997-03-01), Movshovich

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