Title:
MULTI−CHANNEL ECHO CANCEL METHOD, MULTI−CHANNEL SOUND TRANSFER METHOD, STEREO ECHO CANCELLER, STEREO SOUND TRANSFER APPARATUS, AND TRANSFER FUNCTION CALCULATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2003/007500
Kind Code:
A1
Abstract:
Stereo sound signals are reproduced directly from loudspeakers (SP(L), SP(R)). By using a sum signal and a difference signal of the stereo sound signals as a reference signal, and according to a cross spectrum calculation of the reference signal with a microphone−collected sound signal, calculation is performed to obtain transfer functions of four sound transfer systems between the loudspeakers (SP(L), SP(R)) and microphones (MC(L), MC(R)). The transfer functions obtained are subjected to inverse Fourier transform to obtain impulse responses, which are set in filter means (40−1 to 40−4) to create echo cancel signals and perform echo canceling. This solves the problem of an indefinite coefficient in the echo cancel technique of a multi−channel sound signal.
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Inventors:
HIRAI TORU (JP)
OKUMURA HIRAKU (JP)
TOHYAMA MIKIO (JP)
HONJI YOSHIKAZU (JP)
IRIYAMA HIROSHI (JP)
NIIMI KOJI (JP)
OKUMURA HIRAKU (JP)
TOHYAMA MIKIO (JP)
HONJI YOSHIKAZU (JP)
IRIYAMA HIROSHI (JP)
NIIMI KOJI (JP)
Application Number:
PCT/JP2002/006968
Publication Date:
January 23, 2003
Filing Date:
July 10, 2002
Export Citation:
Assignee:
YAMAHA CORP (JP)
HIRAI TORU (JP)
OKUMURA HIRAKU (JP)
TOHYAMA MIKIO (JP)
HONJI YOSHIKAZU (JP)
IRIYAMA HIROSHI (JP)
NIIMI KOJI (JP)
HIRAI TORU (JP)
OKUMURA HIRAKU (JP)
TOHYAMA MIKIO (JP)
HONJI YOSHIKAZU (JP)
IRIYAMA HIROSHI (JP)
NIIMI KOJI (JP)
International Classes:
H04B3/23; H04M3/56; H04M9/08; H04R3/02; (IPC1-7): H04B3/23; H04R3/02
Foreign References:
| EP0709999A2 | 1996-05-01 |
Other References:
BENESTY JACOB ET AL.: "A better understanding and an improved solution to the specific problems of stereophonic acoustic echo cancellation", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, vol. 6, no. 2, March 1998 (1998-03-01), pages 156 - 165, XP002956671
BENESTY JACOB ET AL.: "A hybrid mono/stereo acoustic echo canceler", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, vol. 6, no. 5, September 1998 (1998-09-01), pages 468 - 475, XP000775780
MURTAZA ALI: "Stereophonic acoustic echo cancellation system using time-varying all-pass filtering for signal decorrelation", PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL CONFERENCE ON ACOUSTIC, SPEECH AND SIGNAL PROCESSING, vol. 6, 1998, pages 3689 - 3691, XP000951259
SUEHIRO SHIMAUCHI ET AL.: "New configuration for a stereo echo canceller with nonlinear pre-processing", PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL CONFERENCE ON ACOUSTIC, SPEECH AND SIGNAL PROCESSING, vol. 6, 1998, pages 3685 - 3692, XP000951258
AYA TOKURA ET AL.: "Stereo shingo no muso kanka ni yoru 2 channel densokei no suitei", THE ACOUSTICAL SOCIETY OF JAPAN (ASJ) 3, 2001 NEN SHUUKI KENKYU HAPPYOKAI KOEN RONBUNSHU I, 2 October 2001 (2001-10-02), pages 699 - 700, XP002960744
TAKATOSHI OKUNO ET AL.: "Frame sokan to cross-spectrum shori ni yoru echo yokuatsu", THE ACOUSTICAL SOCIETY OF JAPAN (ASJ) 3, HEISEI 8 NENDO (1996) SHUNKI KENKYU HAPPYOKAI KOEN RONBUNSHU I, 26 March 1996 (1996-03-26), pages 543 - 544, XP002960745
TOSHIHIRO HORIUCHI ET AL.: "2 Ten juon shuseihun bunseki ni yoru sentakuteki shuon", 1998 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS KISO KYOKAI SOCIETY TAIKAI KOEN RONBUNSHU, 7 September 1998 (1998-09-07), pages 135, XP002960746
BENESTY JACOB ET AL.: "A hybrid mono/stereo acoustic echo canceler", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, vol. 6, no. 5, September 1998 (1998-09-01), pages 468 - 475, XP000775780
MURTAZA ALI: "Stereophonic acoustic echo cancellation system using time-varying all-pass filtering for signal decorrelation", PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL CONFERENCE ON ACOUSTIC, SPEECH AND SIGNAL PROCESSING, vol. 6, 1998, pages 3689 - 3691, XP000951259
SUEHIRO SHIMAUCHI ET AL.: "New configuration for a stereo echo canceller with nonlinear pre-processing", PROCEEDINGS OF THE 1998 IEEE INTERNATIONAL CONFERENCE ON ACOUSTIC, SPEECH AND SIGNAL PROCESSING, vol. 6, 1998, pages 3685 - 3692, XP000951258
AYA TOKURA ET AL.: "Stereo shingo no muso kanka ni yoru 2 channel densokei no suitei", THE ACOUSTICAL SOCIETY OF JAPAN (ASJ) 3, 2001 NEN SHUUKI KENKYU HAPPYOKAI KOEN RONBUNSHU I, 2 October 2001 (2001-10-02), pages 699 - 700, XP002960744
TAKATOSHI OKUNO ET AL.: "Frame sokan to cross-spectrum shori ni yoru echo yokuatsu", THE ACOUSTICAL SOCIETY OF JAPAN (ASJ) 3, HEISEI 8 NENDO (1996) SHUNKI KENKYU HAPPYOKAI KOEN RONBUNSHU I, 26 March 1996 (1996-03-26), pages 543 - 544, XP002960745
TOSHIHIRO HORIUCHI ET AL.: "2 Ten juon shuseihun bunseki ni yoru sentakuteki shuon", 1998 NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS KISO KYOKAI SOCIETY TAIKAI KOEN RONBUNSHU, 7 September 1998 (1998-09-07), pages 135, XP002960746
Attorney, Agent or Firm:
Suzuki, Harutoshi (Fujisawa-shi, Kanagawa, JP)
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