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1.发明公开METHOD AND DEVICE FOR MEASURING SOUND WAVE PROPAGATION TIME BETWEEN LOUDSPEAKER AND MICROPHONE 审中-公开方法和用于测量声波之间传输扬声器和麦克风
公开(公告)号：EP1578169A4
公开(公告)日：2008-04-23
申请号：EP03777374
申请日：2003-12-09
申请人： TOA CORP , ETANI ELECTRONICS CO LTD
CPC分类号： H04R29/00
摘要： A sound wave propagation time measurement device (1) includes sound source means (11) and calculation means (12). The sound source means (11) outputs a time stretching pulse as a sound source signal to be input to a loudspeaker (3). The calculation means (12) calculates a correlation function correlating the time stretching pulse with a sound reception signal from a microphone (4) which has received the output sound from the loudspeaker (3). According to this correlation function, the sound wave propagation time between the loudspeaker (3) and the microphone (4) is calculated.
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公开(公告)号：EP1600941A4
公开(公告)日：2008-07-16
申请号：EP04714019
申请日：2004-02-24
申请人： TOA CORP , ETANI ELECTRONICS CO LTD
CPC分类号： H04R29/007 , G01H13/00 , H04R3/04 , H04R2227/007
摘要： Resonance frequencies f2, f3 detected in a resonance space are decided to be dip center frequencies. According to the measurement values obtained in a loudspeaker and a microphone in the resonance space, a basic amplitude frequency characteristic Ca and a target amplitude frequency characteristic Cd are obtained. The target amplitude frequency characteristic Cd has a greater smoothness than the basic amplitude frequency characteristic Ca on the frequency axis. The dip attenuation level and sharpness are decided according to the difference between the basic amplitude frequency characteristic Ca and the target amplitude frequency characteristic Cd at the dip center frequencies f2, f3 and in the vicinity thereof.
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公开(公告)号：EP2455768A4
公开(公告)日：2017-10-25
申请号：EP10799765
申请日：2010-07-07
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