US 2014/0059101 A1Published application

Optimized method of biquad infinite-impulse response calculation

AssigneeQuickfilter Technologies, Inc.

InventorJames C. Steele

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method of performing an infinite-impulse response digital filter includes switching address pointers between a first instance of the filter and a second instance of the filter; where the first and second instances represent the same filter. A first instance of the filter executes operations sequentially multiplying a current input data value, and first and second previous input data values, with corresponding ones of a first set of filter coefficients, using a multiplier; and a second instance of the filter executes operations sequentially multiplying first and second previous intermediate data values with corresponding ones of a second set of filter coefficients, using the multiplier. Switching between first and second instances of the filter occurs at each data input value or frame according to an alternating signal.

Claims8

Dependent claims

A method of performing an infinite-impulse response digital filter, comprising:

in a first instance of the filter executing operations comprising:
sequentially multiplying a current input data value, and first and second previous input data values, with corresponding ones of a first set of filter coefficients, using a multiplier;
sequentially multiplying first and second previous intermediate data values with corresponding ones of a second set of filter coefficients, using the multiplier,
switching between the first instance of the filter and a second instance of the filter;
where the first and second instances represent the same filter;
then,
in the second instance of the filter executing operations comprising:
sequentially multiplying a current input data value, and first and second previous input data values, with corresponding ones of a first set of filter coefficients, in reversed order from the first instance, using a multiplier;
sequentially multiplying first and second previous intermediate data values with corresponding ones of a second set of filter coefficients, in reversed order from the first instance, using the multiplier;
and,
wherein switching between the first and second instances of the filter occurs for each input data value.

8 more elements

An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing an infinite-impulse response digital filter, the method comprising:

in a first instance of the filter executing operations comprising:
sequentially multiplying a current input data value, and first and second previous input data values, with corresponding ones of a first set of filter coefficients, using a multiplier;
sequentially multiplying first and second previous intermediate data values with corresponding ones of a second set of filter coefficients, using the multiplier,
switching between the first instance of the filter and a second instance of the filter;
where the first and second instances represent the same filter;
then,
in the second instance of the filter executing operations comprising:
sequentially multiplying a current input data value, and first and second previous input data values, with corresponding ones of a first set of filter coefficients, in reversed order from the first instance, using a multiplier;
sequentially multiplying first and second previous intermediate data values with corresponding ones of a second set of filter coefficients, in reversed order from the first instance, using the multiplier;
and,
wherein switching between the first and second instances of the filter occurs for each input data value.

8 more elements

Dependencies are inferred from the claim text.