H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/21 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2396245
Coefficients of an adaptive filter are updated in response to a far-end signal and an error signal by using internal coefficients. The adaptive filter operates for generating a first pseudo echo signal in response to the far-end signal. A main filter operates for generating a second pseudo echo signal in response to the far-end signal. A decision is made as to whether or not the coefficients of the adaptive filter and the internal coefficients in the updating process should be initialized. In cases where it is decided that the coefficients of the adaptive filter and the internal coefficients in the updating process should be initialized, a tap length of the adaptive filter and the updating process is set to a non-original value smaller than an original value, and then initialization of the coefficients of the adaptive filter and the internal coefficients in the updating process is executed. The coefficients of the adaptive filter are transferred to the main filter when certain conditions are met. In cases where transfer of the coefficients of the adaptive filter to the main filter is executed after the tap length of the adaptive filter and the updating process is set to the non-original value, the tap length of the adaptive filter and the updating process is set to the original value, and then initialization of the coefficients of the adaptive filter and the internal coefficients in the updating process is executed.
Matsushita Electric Industrial Co. Ltd.
Robic
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