Communications: electrical – Digital comparator systems
Patent
1978-02-13
1979-09-18
Boudreau, Leo H.
Communications: electrical
Digital comparator systems
3401463MA, 340731, 340812, G06K 900
Patent
active
041684893
ABSTRACT:
An electronic system for reducing a full page of text to fit onto the visual display screen of a partial page display word processing device for purposes of reviewing the format and page layout of the text. The text is not always legible in this condensed mode, which is switch selectable by the operator, but while in this mode the text may be edited and manipulated in the normal manner provided by the controls of the word processing device. The system utilizes both electronic digital logic and analog circuits to condense the size of an entire page of text by approximately a factor of three. The digital logic selects and displays only five of the normal fourteen horizontal lines of dots comprising each row of characters within the page of text to be reduced, thus condensing the characters vertically. The analog circuit causes less current to flow through the horizontal winding of the deflection yoke of the cathode ray tube which constitutes the visual display screen without otherwise affecting the display circuit. This causes less deflection of the beam, thus condensing the page of text horizontally.
REFERENCES:
patent: 3289164 (1966-11-01), Rabinow
patent: 3991868 (1976-11-01), Robinson et al.
patent: 4069511 (1978-01-01), Lelke
patent: 4087808 (1978-05-01), Herndon
patent: 4090188 (1978-05-01), Suga
patent: 4097846 (1978-06-01), Lewis
Boudreau Leo H.
Horn Martin R.
Lexitron Corp.
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