Frame line inserting circuit for printer

Details Frame line inserting circuit for printer Frame line inserting circuit for printer

1991-04-12

1993-05-11

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358 75, 346 76PH, H04N 121

Patent

active

052106152

ABSTRACT:
A frame line inserting circuit in a printer for enabling the printing video data within a defined printing area of a printing paper, and enabling the printing of frame lines at selected horizontal and vertical boundaries of the printing paper where no video data is found. The circuit of the present invention includes: an A/D converter for converting the received analog video data signals to digital video data by pixel unit; a color ROM capable of storing at least one or more color data, for generating color data for printing frame lines by an external selection; a first counter set to a vertical count value serving as the vertical frame line inserting period, for counting column pixels and generating a first logic signal at the vertical count value; a second counter set to a horizontal count value serving as the horizontal frame line inserting period, for counting a row pixels and generating a first logic signal at the horizontal count value; a gate for multiplying the outputs of the first and second counters logically, and for generating a first logic signal when the first counter or/and second counter output; and a switch with common terminal connected to the line memory.

REFERENCES:
patent: 4587569 (1986-05-01), Nakamura et al.
patent: 4974069 (1990-11-01), Shimomura

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