Method and device for filtering during a change in an arma filter
AssigneeOrange
InventorsAlexandre Guerin, Julien Faure, Claude Marro
Life of this patent
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Abstract
A method and device are provided for filtering digital audio signals using at least one ARMA filter, particularly during a filter change. The method includes the following steps: a step of receiving a first request to change filtering to or from filtering by a first ARMA filter; and, in response to the first request, a step of gradually switching, at each of a plurality of cascaded first filtering blocks, between digital-signal filtering by a first basic filtering cell and digital-signal filtering by another associated basic filtering cell, the first basic filtering cells of the plurality of first filtering blocks factorizing the first filter.
Claims15
A process for filtering a digital signal, the process comprising:
- a receiving step of a first request for filtering change to or from filtering by a first ARMA filter, wherein in response to said first request the method comprises a progressive switching step at a level of each of a plurality of first cascaded filtering blocks between digital signal filtering by a first elementary filtering cell originating from factorisation of the first filter and digital signal filtering by another associated elementary filtering cell, and
- wherein all of said first elementary filtering cells of the plurality of first filtering blocks factorise said first ARMA filter.
A filtering device for a digital signal, comprising:
- a plurality of first cascaded filtering blocks, each comprising a first elementary filtering cell and another associated elementary filtering cell, all of said first elementary filtering cells of the plurality of first filtering blocks being configured to factorise a first ARMA filter;
- at least one control element configured to control, at the level of each first filtering block, a filtering change in response to a first request for filtering change to or from filtering by the first ARMA filter,
- and each said first filtering block is configured to conduct the filtering change by progressive switching between digital signal filtering by the first elementary filtering cell and digital signal filtering by said other associated elementary filtering cell.
A memory device comprising a computer program product stored thereon and readable by a microprocessor, the computer program product comprising instructions that configure the microprocessor to perform a process for filtering a digital signal when this program is loaded and executed by the microprocessor, wherein the process comprises:
- a step of the microprocessor receiving a first request for filtering change to or from filtering by a first ARMA filter, wherein in response to said first request the microprocessor implements a progressive switching step at a level of each of a plurality of first cascaded filtering blocks between digital signal filtering by a first elementary filtering cell originating from factorisation of the first filter and digital signal filtering by another associated elementary filtering cell, and
- wherein all of said first elementary filtering cells of the plurality of first filtering blocks factorise said first ARMA filter.
Dependencies are inferred from the claim text.