| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration in echo cancellation in units of frequency by independently discriminating propriety of learning for each frequency, in a frequency region type echo canceller provided with an adaptive filter for each frequency. SOLUTION: The echo canceller of a frequency region type is provided with a double talk detection section 17. This double talk detection section 17 applies learning processing to a frame of an adaptive filter 12, on the basis of a reception signal, a transmission signal. a pseudo echo signal and a residual error signal with respect to the transmission signal. independently decides propriety of learning especially for each frequency and uses a group average for part of reference values at the decision. Thus, opportunities for learning by frequencies are increased and errors in learning is reduced to enhance performance of double talk detection by frequencies, thereby preventing deterioration in an echo cancellation amount in units of frequency.
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