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Electronic high-fidelity screenless conversion system

  • US 5,331,430 A
  • Filed: 10/11/1991
  • Issued: 07/19/1994
  • Est. Priority Date: 10/11/1991
  • Status: Expired due to Fees
First Claim
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1. A system for converting input values into output values, each of said input values having one of at least M possible levels and each of said output values having one of N possible levels, where M is greater than N, said system converting, in turn, each of said input values into a corresponding output value so that, at a given instant in time, an input value undergoing conversion has before it previously converted input values and after it input values yet to be converted, said system comprising:

  • error generating means for generating at least first and second errors for said input value undergoing conversion, said first error being based upon an output value corresponding to a previously converted input value, based upon an output value estimated from a corresponding input value yet to be converted, and based upon an output value having a first level assumed for said input value undergoing conversion, and said second error being based upon an output value corresponding to a previously converted input value, based upon an output value estimated from a corresponding input value yet to be converted, and based upon an output value having a second level assumed for said input value undergoing conversion;

    output value setting means for setting said input value undergoing conversion to an output value having said first level if the absolute value of said first error is less than the absolute value of said second error or to an output value having said second level if the absolute value of said first error is greater than the absolute value of said second error; and

    ,diffusing means for diffusing, to a selected number of said input values yet to be converted, said first error if said input value undergoing conversion is set to said output value having said first level or said second error if said input value undergoing conversion is set to said output value having said second level.

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