| 摘要 |
PROBLEM TO BE SOLVED: To properly suppress an acoustic echo even in the case of using in an environment which receives a disturbance. SOLUTION: A signal except a frequency band audible by a person is attenuated for a reference signal used when the acoustic echo included in the recorded sound input signal of a microphone 15 is removed. An echo canceling unit 20 generates a transmitting signal by subtracting the reference signal including many signals of the frequency band which can be listed by the person from the sound input signal, and outputs the generated transmitting signal to a communication module 13. Thus, the reference signal can have characteristics near the frequency characteristics of the acoustic echo. As a result, the acoustic echo included in the sound input signal can be properly suppressed without receiving the influence of a disturbance element. COPYRIGHT: (C)2004,JPO&NCIPI
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