Title:
ECHO PROCESSING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2002/095975
Kind Code:
A1
Abstract:
An echo processing apparatus includes high−pass filter (11) for suppressing a low frequency band component of a reception signal, a loudspeaker (3) for outputting the low band−suppressed reception signal which has passed through the high−pass filter (11) as acoustics, an A&sol D converter (6) for converting an acoustic echo input from a microphone (4) to a digital transmission signal, and echo canceller means (7) for generating a pseudo echo signal in accordance with the low band−suppressed reception signal which has passed through the high−pass filter (11), subtracting the pseudo echo signal from the digital signal which has been converted by the A&sol D converter (6), and eliminating the acoustic echo output from the loudspeaker (3) and input to the microphone (4).
Inventors:
TAKAHASHI SHINYA (JP)
MATSUOKA BUNKEI (JP)
KAJIYAMA IKUO (JP)
MATSUOKA BUNKEI (JP)
KAJIYAMA IKUO (JP)
Application Number:
PCT/JP2002/004860
Publication Date:
November 28, 2002
Filing Date:
May 20, 2002
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
TAKAHASHI SHINYA (JP)
MATSUOKA BUNKEI (JP)
KAJIYAMA IKUO (JP)
TAKAHASHI SHINYA (JP)
MATSUOKA BUNKEI (JP)
KAJIYAMA IKUO (JP)
International Classes:
H04M1/60; H04M9/08; H04M19/08; H04R3/02; G10L21/0208; H04M1/725; (IPC1-7): H04B3/23; H04M1/60; H04R3/02; G10L21/02
Foreign References:
| JP2000101484A | 2000-04-07 | |||
| JPH01198155A | 1989-08-09 | |||
| JPH08256089A | 1996-10-01 | |||
| JPH0766756A | 1995-03-10 | |||
| JPH11289283A | 1999-10-19 |
Other References:
HIROSHI RIKIMARU: "Chokakukei ni okeru joho shori no kozo", SURI KAGAKU, vol. 36, no. 1, 1 January 1998 (1998-01-01), pages 22 - 33, XP002955036
YURIKO TSUKAHARA, SHIGENOBU MINAMI: "Echo canceller-noise canceller heiyo no okeru kadai to taisaku", 5 September 1994, 1994-NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SHUKI TAIKAI KOEN RONBUNSHU, B-331, XP002955037
See also references of EP 1300963A4
YURIKO TSUKAHARA, SHIGENOBU MINAMI: "Echo canceller-noise canceller heiyo no okeru kadai to taisaku", 5 September 1994, 1994-NEN THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS SHUKI TAIKAI KOEN RONBUNSHU, B-331, XP002955037
See also references of EP 1300963A4
Attorney, Agent or Firm:
Tazawa, Hiroaki (Kasumigaseki 3-Chome Chiyoda-ku, Tokyo, JP)
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