Digital filter device, digital filtering method, and program recording medium
AssigneeNEC Corporation
InventorAtsufumi SHIBAYAMA
Life of this patent
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Abstract
In order to reduce a circuit scale and power consumption while maintaining filter performance, a digital filter device includes a first transform circuit for executing a first transform process on data in a predetermined frequency range; a filtering circuit for executing a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed by the first transform circuit, to a different bit width from bit widths of other frequency components; and a second transform circuit for executing a second transform process on the data on which the filtering process was executed by the filtering circuit.
Claims10
A digital filter device comprising:
- a first transform circuit configured to execute a first transform process on data in a predetermined frequency range;
- a filtering circuit configured to execute a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed by the first transform circuit, to a different bit width from bit widths of other frequency components;
- and
- a second transform circuit configured to execute a second transform process on the data on which the filtering process was executed by the filtering circuit.
A digital filtering method by one or more processor, the method comprising:
- executing a first transform process on data in a predetermined frequency range;
- executing a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed, to a different bit width from bit widths of other frequency components;
- and
- executing a second transform process on the data on which the filtering process was executed.
A non-transitory program recording medium having a digital filtering program recorded thereon, the digital filtering program causing a computer to execute:
- a process of executing a first transform process on data in a predetermined frequency range;
- a process of executing a filtering process by setting an operation bit width of data of a preset first frequency component among the data, on which the first transform process was executed, to a different bit width from bit widths of other frequency components;
- and
- a process of executing a second transform process on the data on which the filtering process was executed.
Dependencies are inferred from the claim text.