Scan linearity correction
Patent 4860237 Issued on August 22, 1989. Estimated Expiration Date: 
August 22, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 22, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3015444 3254203 3689914 3701890 3763363 3917932 Digital function generator utilizing cascade accumulation High speed pulse interpolator Complex waveform generator for musical instrument High resolution musical note oscillator and instrument that includes the note oscillator InventorAssigneeApplicationNo. 06/637660 filed on 08/03/1984US Classes:708/270Function generationExaminersPrimary: Harkcom, Gary V.Assistant: Shaw, Dale M. Attorney, Agent or FirmInternational ClassesG06F 7/62 (20060101)G06F 7/60 (20060101) H04N 1/053 (20060101) H04N 1/047 (20060101) G06K 15/12 (20060101) AbstractA method for generating a variable frequency clock pulse for a raster scanner. First, a correction number, which may be the sum of corrections for scan-nonlinearity, polygon signature errors and motor hunt errors, is generated. This number is then added periodically to a running sum. The most significant bit of this sum is then available as the clock pulse output. The frequency of the output clock will be proportional to the correction number. The described circuit uses an accumulating adder and a register loop to form an accumulator circuit. The correction number is then supplied to the other accumulator adder input, and the register is clocked with a fixed frequency sample clock pulse.Other References
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