公开(公告)号：US3781849A

公开(公告)日：1973-12-25

申请号：US3781849D

申请日：1972-03-20

Applicant: COLUMBIA BROADCASTING SYST INC

Inventor： BARON S ,  KREINIK S

IPC: G09G5/24 ,  G06F3/14

CPC classification number: G09G5/24 ,  G09G5/243

Abstract: A subsystem of an apparatus that receives characterrepresentative signals and generates video control signals and keying control signals that are suitable for controlling a scanned display to present contrasting character images. A stroke generator means, responsive to the character-representative signals, generates a stroke of a character to be displayed. The stroke consists of a plurality of time sequential bits corresponding to a sequence of display events and a plurality of code bits that distinguish between contrasting portions of the sequence of display events. A decoding means is responsive to the time sequential bits and the code bits and generates keying control signals and video control signals that are suitable for controlling a scanned display to present contrasted images of characters to be displayed. In a preferred embodiment of the invention, the code bits are representative of the keying and video portions of the sequence of display events. The coding means produces signals that disable the generation of video signal during selected stroke portions, the code bits being determinative of which portions of the display event are to be disabled.

Abstract translation: 一种接收字符代表信号并产生视频控制信号和键控控制信号的装置的子系统，其适合于控制扫描的显示以呈现对比字符图像。 响应于字符代表信号的笔划发生器装置产生要显示的字符的笔画。 笔画包括对应于显示事件序列的多个时间顺序位和区分显示事件序列的对比部分的多个码位。 解码装置响应于时间顺序位和码位，并产生适合于控制扫描显示的键控控制信号和视频控制信号，以显示要显示的字符的对比图像。 在本发明的优选实施例中，码位表示显示事件序列的键控和视频部分。 编码装置产生禁止在所选择的笔划部分期间产生视频信号的信号，所述码位决定显示事件的哪些部分被禁用。