H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01)
Patent
CA 2199566
The echo canceller of the present invention comprises a means for estimating an echo gain from a reception signal and a transmission signal; first level calculating means for calculating the power of the reception signal; second level calculating means For calculating the power of the transmission signal; echo gain estimating means for estimating an echo gain based on the power of the reception signal and the power of the transmission signal; and echo level estimating means for adding the estimated echo gain to the power of the reception signal to obtain an estimated echo level, third level calculating means for calculating the power of a residual signal; and comparator means for comparing the estimated echo level with the power of the residual signal after the echo cancellation; wherein the echo of the reception signal contained in the transmission signal is cancelled when said estimated echo level exceeds the value obtained by adding a margin to the power of the residual signal. The various powers may be logarithmic values.
Kajiyama Ikuo
Shiraki Koichi
Adams Thomas
Mitsubishi Denki Kabushiki Kaisha
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