Apparatus and method for velocity compensation of the scanning s

Details Apparatus and method for velocity compensation of the scanning s Apparatus and method for velocity compensation of the scanning s

1991-10-29

1994-07-26

Lobo, Ian J.

Facsimile and static presentation processing

Facsimile

Picture signal generator

348203, H04N 104

Patent

active

053330676

ABSTRACT:
Apparatus for generating a pixel clock to control the timing of data pulses in an optical scanning device. A VCO is utilized to generate the pixel clock. The control voltage for the VCO is provided by a digital-to-analog converter ("DAC") which converts the count generated by a pixel reference location counter driven by a reference clock. The output of the DAC is fed back as the reference voltage for the DAC. The effect is to either increase or decrease the DAC reference voltage depending on whether positive or negative feedback is implemented, thereby varying the pixel clock frequency for the image data stream as a function of pixel position. By selecting the appropriate feedback and feedback gain, the pixel placement can be made uniform across the scan line.

REFERENCES:
patent: 4541061 (1985-09-01), Schoon
patent: 4586057 (1986-04-01), Schoon
patent: 4972258 (1990-11-01), Wolf et al.
patent: 5115328 (1992-05-01), Kadono
patent: 5121138 (1992-06-01), Scherwer et al.
patent: 5146224 (1992-09-01), Kitayoshi
patent: 5164843 (1992-11-01), Swanberg

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