| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology correctly judging a direct wave of a test tone from a speaker. SOLUTION: A judgement method disclosed herein includes: a step 103 of calculating distances L1, L2 from a speaker to two microphones and a difference L12 between the distances on the basis of a time when high amplitudes V1, V2 are obtained in output signals of the two microphones; a step 104 of judging the calculated distance difference L12 is within a normal range with respect to an interval d between the microphones; a step 105 of judging the amplitudes V1, V2 by the direct wave of the test tone when the distance difference L12 is within the normal range as a result of the judgement; a step 112 of scanning the vicinity of an amplitude around the amplitude obtained earlier with respect to the amplitude obtained later in the amplitudes V1, V2 when the distance difference L12 is not within the normal range; and steps 114, 105 of judging an obtained amplitude by the scanning and the amplitude obtained earlier as the amplitudes of the direct wave of the test tone when the amplitude is obtained around the amplitude obtained earlier as a result of the scanning. COPYRIGHT: (C)2007,JPO&INPIT
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