Method and apparatus for echo cancellation
AssigneeOki Electric Industry Co., Ltd.
InventorYoshihiro Ariyama
Life of this patent
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Abstract
An echo canceler for generating an echo replica and subtracting the echo replica from a local input signal to create a residual signal for outgoing transmission. An echo canceler has adaptive filters that have different computational accuracy generating the echo replica. An evaluator coupled to the adaptive filters groups coefficients into each of segments, and evaluating a computational accuracy information according to the coefficients for the segments. A computational accuracy controller in the evaluator assigns the local input signal to the adaptive filters, and adjusts the coefficients according to the computational accuracy information.
Claims12
An echo canceler for generating an echo replica and for subtracting the echo replica from a local input signal to create a residual signal for outgoing transmission, comprising:
- a plurality of adaptive filters which have different computational accuracy for generating the echo replica;
- an evaluator coupled to said adaptive filters for grouping coefficients into a plurality of segments, and evaluating a computational accuracy information according to the coefficients for said segments;
- and
- a controller in said evaluator for assigning said local input signal into said adaptive filters, and adjusting the coefficients according to the computational accuracy information.
A method of canceling an echo component of a local input signal to create a residual signal for outgoing transmission, comprising the steps of:
- grouping coefficients into a plurality of segments;
- evaluating a computational accuracy information according to the coefficients for said segments;
- assigning said local input signal to said adaptive filters according to the computational accuracy information;
- and
- adjusting the coefficients.
Dependencies are inferred from the claim text.