Circuit arrangement for scanning the character elements of chara

Details Circuit arrangement for scanning the character elements of chara Circuit arrangement for scanning the character elements of chara

1978-10-02

1980-06-24

Robinson, Thomas A.

Telegraphy

Systems

Line-clearing and circuit maintenance

375106, H04L 700, H04J 306, H04L 1308

Patent

active

042096626

ABSTRACT:
A circuit arrangement for scanning the character elements of characters, respectively occurring within a prescribed duration, at arbitrarily determinable points, in particular for the correction of teletypewriter characters by means of scanning the individual character elements with the aid of scanning pulses output by an impulse generator, the scanning pulses being fed to a scanning circuit together with the individual character elements, provides that in the impulse generator a pulse-controlled multi-stage register is provided whose output side is connected to its input side by way of an adder circuit. The adder provides that the code words contained in the register can respectively be altered by a prescribed value with every pulse actuation. A memory, in the form of a programmable read only memory, is provided and has its input side connected to the output of the register, or of the adder circuit, and contains stored controlled signals in specified fixed storage locations which can be actuated by the code words of the register, or of the adder circuit. With the actuation of the respective storage locations, beginning after the start of a character has been determined, the control signals contained in the memory locations are caused to output impulses from the output side of the memory, which pulses are utilized as the desired scanning pulses.

REFERENCES:
patent: 3869570 (1975-03-01), Nguyen-Tat et al.
patent: 3912863 (1975-10-01), Patience
patent: 4045618 (1977-08-01), Lagarde et al.
patent: 4063029 (1977-12-01), Elstner

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