H - Electricity – 04 – M
Patent
H - Electricity
04
M
379/65
H04M 1/74 (2006.01) H04B 3/23 (2006.01) H04M 5/16 (2006.01)
Patent
CA 1180141
ABSTRACT OF THE DISCLOSURE An echo canceller unit circuit for combining an in- verted echo estimate signal derived from a receiver signal with a second signal, the circuit including a delay circuit having a plurality of taps, a plurality of multipliers, each multiplier weighting the output from a corresponding one of the taps, an adder for summing the output from the multipliers, a subtractor for reversing the polarity of the output signal from the adder and adding the reversed polarity output signal to a send path, a weighting coefficient correction circuit for correcting the weight- ing coefficients applied to the multipliers in such a way that the receive signal applied to the delay circuit and the output signal from the subtractor have no correlation with each other, a multi- plication factor circuit for generating a multiplication factor and multiplying the factor by the weighting coefficient of each of the multipliers, a speech detection circuit responsive to a speech level above a predetermined threshold value for inhibiting the weighting coefficient correction by the weighting coefficient correction circuit, output terminals for delivering part of the output from the delay circuit, part of the output from each of the multipliers, the output from the multiplication factor circuit, and the output from the subtractor, and input terminals for re- ceiving the receive signal, part of the input to the adder, part of the input to the multiplication factor circuit and part of the input to the weighting coefficient circuit.
389640
Sakamoto Takashi
Takahashi Kenzo
Gowling Lafleur Henderson Llp
Nippon Telegraph & Telephone Public Corporation
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