| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice detection device for accurately detecting speaking voice without responding to noise regardless of the large and small of the noise. SOLUTION: The voice detection device includes two directional microphones, environment noise is substantially equally input to both of the microphones, and a target voice signal (uttered voices of speakers) is input to only one microphone. The voice detection device calculates a level difference D between the voice signals (collected signals) collected by both of the microphones, and calculates a power ratio P. The voice detection device sets threshold values DT1, DT2 (DT1<DT2) on the level difference D, and sets threshold values PT1, PT2 (PT1>PT2) on the power ratio P. The voice detection device determines that the target voice signal is input when any one of D>DT1 and P>PT1 or D>DT2 and P>PT2 is satisfied. COPYRIGHT: (C)2009,JPO&INPIT
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