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US 8,352,527 B1Granted
Statistical method for filter convergence without accumulating residual error
AssigneeCypress Semiconductor Corporation
InventorDavid Van Ess
Life of this patent
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Abstract
Disclosed is a filter circuit, comprising a signal to be filtered, a difference circuit coupled to the signal to be filtered, a filter having an input coupled to the difference circuit, an integrator (or accumulator) having a first input coupled to an output of the filter circuit, and having a second input, and an accumulator coupled to an output of the integrator. A method of filtering is described also.
Claims23
A filter apparatus, comprising:
- a difference circuit coupled to receive an input signal to be filtered;
- a divider having an input coupled to an output of the difference circuit;
- a summing function module having a first input coupled to an output of the divider, and having a second input;
- a number generator coupled with the second input, wherein the number generator is configured to generate a value according to a probability determined by dividing a residue value resulting from a divide operation performed by the divider by a highest potential value of the residue;
- and
- an accumulator register coupled to an output of the summing function module.
3 more elements
A method of filtering, comprising:
- determining a first difference value;
- filtering the first difference value to provide a filtered output and a residue value resulting from a divide operation;
- generating a second value according to a probability determined by dividing the residue value by a highest potential value of the residue;
- integrating the filtered output and the second value to generate an integrated value;
- and
- accumulating the integrated value and providing an accumulated output value.
3 more elements
A method of filtering, comprising:
- determining a difference between an input signal and an output signal;
- performing a divide operation on the difference to create a divided value and a residue of the divide operation of;
- generating a weighted round up for the divided value, wherein a probability of the weighted round up is determined by dividing the residue by a highest potential value of the residue;
- and
- updating an accumulator with the divided value.
2 more elements
A system, comprising:
- means for determining a first difference value;
- means for filtering the first difference value to provide a filtered output and a residue value resulting from a divide operation;
- means for generating a second value according to a probability determined by dividing the residue value by a highest potential value of the residue;
- means for integrating the filtered output and the second value;
- and
- means for accumulating the integrated value and providing an accumulated output value.
3 more elements
Dependencies are inferred from the claim text.