Patent ID: 7327380

Claim:
An apparatus for printing a multibit per pixel image from a halftone binary digital bitmap having pixels comprising: a) memory for receiving said multibit per pixel image; b) lookup table external to said memory disposed in a programmable gate array for converting said multibit per pixel image to a base duty cycle and wherein said base duty cycle is disposed in said programmable gate array and is adapted for creating a modulated drive signal from said base duty cycle to modulate an exposure for each pixel in said multibit per pixel image; c) a printer adapted for using said modulated exposure to print an image, having a dpi greater than 1400, further comprising a drum capable of spinning; d) an encoder disposed on said drum for providing a home signal and a pixel rate; and e) a phase lock loop in communication with said programmable gate array to modify said pixel rate to a multiple of said pixel rate forming a high frequency pixel clock which is 2 n times the pixel rate, wherein n is an integer.