Apparatus for generating an enlargement/reduction signal

Abstract

An enlargement/reduction signal generating apparatus comprises means for generating basic clock pulses, means for generating frequency-divided clock pulses of different kinds, having the different frequencies by dividing the frequency of said basic clock pulses, means for generating selection signals to combine said clock pulses generated by said basic clock pulse generating means and said frequency-divided clock pulse generating means, whereby the ratio of said reading clock pulses to said writing clock pulses corresponds to a predetermined enlargement/reduction ratio, and means for making enlargement/reduction clock pulses by combining said basic clock pulses and said frequency-divided clock pulses in correspondence with said selection signals from said selection signal generating means and for outputting said enlargement/reduction clock pulses as said reading clock pulses or said writing clock pulses. The enlargement/reduction signal generating apparatus is an apparatus for generating reading clock pulses and writing clock pulses to enlarge or reduce the image of digital data stored in a storing means. The apparatus may be disposed in an image processing unit for processing image information. The image processing unit may be used as a unit which receives image information from an optical unit, enlarges or reduces the image information, and outputs the enlarged/reduced image information to an image forming part, in a copying machine having a scanner and a printer. The copying machine may be a digital copying machine having a laser unit.