| 摘要 |
PROBLEM TO BE SOLVED: To ensure higher versatility in a sound-signal processing configuration for echo cancelation which allows changes in tap length. SOLUTION: A device for processing a sound signal has an adaptive filter for echo-canceling processing. The tap length of a digital filter forming the adaptive filter is further changed, on the basis of a specified status related to adaptive processing. According to this configuration, rather than the tap length of the digital filter being changed-over, in response to conditions in a communication apparatus at a calling place but is changed dynamically (adaptively), according to the adaptive processing status at that time. When the tap length of an adaptive filter system becomes a fixed value or smaller, a change-over operation is switched to operation by sound switching. COPYRIGHT: (C)2009,JPO&INPIT
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