公开(公告)号：DE602004026836D1

公开(公告)日：2010-06-10

申请号：DE602004026836

申请日：2004-02-24

Applicant: TOA CORP ,  ETANI ELECTRONICS CO LTD

Inventor： HIGASHIHARA DAISUKE ,  HINO SHOKICHIRO ,  TSUCHIYA KOICHI ,  ENDO TOMOHIKO

IPC: G10K15/00 ,  H04R3/02 ,  G01H13/00 ,  H03F3/181 ,  H03G5/16 ,  H04R3/04 ,  H04R29/00

Abstract: Resonant frequencies f2 and f3 detected in a resonant space are determined as center frequencies of a dip. Based on measurement values at a speaker and a microphone in the resonant space, a basic amplitude frequency characteristic Ca and a target amplitude frequency characteristic Cd are found. A smoothness degree on a frequency axis is larger in the target amplitude frequency characteristic Cd than the basic amplitude frequency characteristic Ca. A damping level and quality factor of the dip are determined based on a difference between the basic amplitude frequency characteristic Ca and the target amplitude frequency characteristic Cd in the center frequencies f2 and f3 of the dip and frequencies near the center frequencies.

公开(公告)号：AU2003289256A8

公开(公告)日：2004-06-30

申请号：AU2003289256

申请日：2003-12-09

Applicant: TOA CORP ,  ETANI ELECTRONICS CO LTD

Inventor： TSUCHIYA KOICHI ,  ENDO TOMOHIKO ,  HIGASHIHARA DAISUKE ,  HINO SHOKICHIRO

IPC: H04R29/00 ,  G01S11/14 ,  H04R3/00 ,  H04S7/00 ,  H04R3/02

Abstract: A device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12 . The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3 . The calculation means 12 calculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speaker 3 and is received in a microphone 4 . Based on the cross-correlation function, the propagation time of the sound wave between the speaker 3 and the microphone 4 is found.

公开(公告)号：EP1600941A4

公开(公告)日：2008-07-16

申请号：EP04714019

申请日：2004-02-24

Applicant: TOA CORP ,  ETANI ELECTRONICS CO LTD

Inventor： HIGASHIHARA DAISUKE ,  HINO SHOKICHIRO ,  TSUCHIYA KOICHI ,  ENDO TOMOHIKO

IPC: H04R3/02 ,  G01H13/00 ,  G10K15/00 ,  H03F3/181 ,  H03G5/16 ,  H04R3/04 ,  H04R29/00

CPC classification number: H04R29/007 ,  G01H13/00 ,  H04R3/04 ,  H04R2227/007

Abstract: 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.

公开(公告)号：AU2003289256A1

公开(公告)日：2004-06-30

申请号：AU2003289256

申请日：2003-12-09

Applicant: TOA CORP

Inventor： TSUCHIYA KOICHI ,  ENDO TOMOHIKO ,  HIGASHIHARA DAISUKE ,  HINO SHOKICHIRO

IPC: H04R29/00 ,  G01S11/14 ,  H04R3/00 ,  H04S7/00 ,  H04R3/02

Abstract: A device 1 for measuring a propagation time of a sound wave comprises a sound source means 11 and a calculation means 12 . The sound source means 11 outputs a time stretched pulse as a sound source signal input to a speaker 3 . The calculation means 12 calculates a cross-correlation function of the time stretched pulse and the sound signal which is output from the speaker 3 and is received in a microphone 4 . Based on the cross-correlation function, the propagation time of the sound wave between the speaker 3 and the microphone 4 is found.

公开(公告)号：EP1578169A4

公开(公告)日：2008-04-23

申请号：EP03777374

申请日：2003-12-09

Applicant: TOA CORP ,  ETANI ELECTRONICS CO LTD

Inventor： HIGASHIHARA DAISUKE ,  HINO SHOKICHIRO ,  TSUCHIYA KOICHI ,  ENDO TOMOHIKO

IPC: H04R29/00 ,  G01S11/14 ,  H04R3/00 ,  H04S7/00

CPC classification number: H04R29/00

Abstract: 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.