Patent ID: 6650197
Filing Date: 2003-11-18
Classification: G06F,H03K

Abstract:
A pulsewidth modulation apparatus for inputting multivalued pixel data expressed in a plurality of bits, generating a signal having a pulsewidth corresponding to a value of the multivalued pixel data, and outputting the generated signal to a predetermined print engine, comprising:storage means arranged to store a digital pattern in an address position corresponding to the value of each multivalued pixel data in order to generate a binary-valued pattern corresponding to the value of the multivalued pixel data; and output means arranged to access said storage means by using inputted multivalued pixel data as an address to read a corresponding binary-valued pattern, and output a pulsewidth signal corresponding to a state of bits of the pattern, wherein the pattern stored in said storage means has a number of bits larger than a number that can be expressed by a number of bits of the inputted multivalued pixel data, and the pattern is rewritable.