Pulse width modulator for a printing apparatus

Details Pulse width modulator for a printing apparatus Pulse width modulator for a printing apparatus

G - Physics

06

K

354/236.1

G06K 15/00 (2006.01) G06K 15/02 (2006.01) G06K 15/10 (2006.01) H04N 1/40 (2006.01)

Patent

CA 1304520

PATENT 7217/27479 ABSTRACT OF THE INVENTION A head drive system for printer apparatus for gray scale recording divides digital data representing each pixel into upper and lower groups of bits respectively defining upper bit data and lower bit data. The lower bit data is compared with periodic reference data. On the basis of the comparison, binary data is derived and added to the upper bit data to form output data for controlling a printer head. The invention combines the advantages of density modulation and area modulation and at the same time enables high speed data processing and printing.

566742

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