Browse Prior Art Database

Generation of Double Size Characters

IP.com Disclosure Number: IPCOM000073981D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Holderness, CJ: AUTHOR

Abstract

In display environments where there is a minimum of available display space and a limited amount of information required to be displayed, it is often desirable to provide larger characters for presentation of desired information.

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Generation of Double Size Characters

In display environments where there is a minimum of available display space and a limited amount of information required to be displayed, it is often desirable to provide larger characters for presentation of desired information.

The character generation and multiplexing system shown provides for the capability of generating double size characters for display on a CRT. Information from frame buffer 1 is gated by gate 2 to line buffer 3. This information initially represents characters for row one of a first display. As the characters are shifted to the right out of line buffer 3, a character segment is generated by segment generator 12. This character segment is the first or second segment of a character, depending upon whether the even or odd field of the display is being generated. That segment is transmitted to parallel-to-serial converters 17 and 18 which transmit, in turn, a serial video data stream to video mixers 27 through 34.

As data is sequentially shifted out of line buffer 9, the data is also gated by gate 4 to line buffer 5, which in turn, has its output gated to line buffer 7 by gate
6. Sequentially, the outputs from line buffer 7 is gated by gate 8 to line buffer 9. The output from line buffer 9 is gated by gate 10 to the input of line buffer 11 which provides a recirculating input to gate 10. Also, the outputs of each respective line buffer is connected to the input of the respective segment generator 13, 14, 15 and 16.

Similarly, the outputs of the segment generators are connected to pairs of...