ECHO CANCELLATION APPARATUS, ECHO CANCELLATION METHOD AND PROGRAM THEREFOR

Title:

ECHO CANCELLATION APPARATUS, ECHO CANCELLATION METHOD AND PROGRAM THEREFOR

Document Type and Number:

Japanese Patent JP2015019183

Kind Code:

A

Abstract:

PROBLEM TO BE SOLVED: To provide an echo cancellation apparatus, method and program to which an FG/BG scheme is applicable in wave-number domains.SOLUTION: A reproduction signal in a wave-number domain is multiplied by a first filter coefficient, thereby generating a first echo replica in the wave-number domain. The first echo replica in a time domain is subtracted from a sound recording signal in the time domain, thereby calculating a first error signal. The reproduction signal in the wave-number domain is multiplied by a second filter coefficient, thereby generating a second echo replica in the wave-number domain. The second echo replica in the time domain is subtracted from a sound recording signal in the time domain, thereby calculating a second error signal. While using the first error signal in the wave-number domain and the reproduction signal in the wave-number domain, the first filter coefficient within a first echo replica generation part is updated. For each number of waves of each frequency, the first error signal and the second error signal are compared. When it is determined that echo in the first error signal is erased more than in the second error signal, the first filter coefficient within the first echo replica generation part is transferred to a second echo replica generation part.

Inventors:

EMURA AKIRA
HIWAZAKI YUUSUKE
OMURO NAKA

Application Number:

JP2013144098A

Publication Date:

January 29, 2015

Filing Date:

July 10, 2013

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE

International Classes:

H04B3/23

Domestic Patent References:

JP2003008480A	2003-01-10
JP2000244372A	2000-09-08
JP2001016142A	2001-01-19
JP2008124914A	2008-05-29
JP2003008480A	2003-01-10
JP2000244372A	2000-09-08
JP2001016142A	2001-01-19
JP2008124914A	2008-05-29

Foreign References:

US20090116638A1	2009-05-07
US20090116638A1	2009-05-07

Other References:

JPN6015016775; Ｈｅｒｂｅｒｔ　Ｂｕｃｈｎｅｒ　ｅｔ　ａｌ．: 'ＷＡＶＥ-ＤＯＭＡＩＮ　ＡＤＡＰＴＩＶＥ　ＦＩＬＴＥＲＩＮＧ：　ＡＣＯＵＳＴＩＣ　ＥＣＨＯ　ＣＡＮＣＥＬＬＡＴＩＯＮ　ＦＯＲ　ＦＵＬＬ-ＦＵＰＬＥＸ　ＳＹＳＴＥＭＳ　ＢＡＳＥＤ　ＯＮ　ＷＡＶＥ-ＦＩＥ' ＩＥＥＥ　Ｉｎｔｅｒｎａｔｉｏｎａｌ　Ｃｏｎｆｅｒｅｎｃｅ　ｏｎ　Ａｃｏｕｓｔｉｃｓ，　Ｓｐｅｅｃｈ，　ａｎｄ　Ｓｉｇｎａｌ　Ｐｒｏｃｅｓｓｉｎｇ，　２００４　（ＩＣＡＳＳＰ　'０４）Ｖｏｌ．　４, 200405, ｐｐ．ＩＶ-１１７〜ＩＶ-１２０
JPN6015016775; Ｈｅｒｂｅｒｔ　Ｂｕｃｈｎｅｒ　ｅｔ　ａｌ．: 'ＷＡＶＥ-ＤＯＭＡＩＮ　ＡＤＡＰＴＩＶＥ　ＦＩＬＴＥＲＩＮＧ：　ＡＣＯＵＳＴＩＣ　ＥＣＨＯ　ＣＡＮＣＥＬＬＡＴＩＯＮ　ＦＯＲ　ＦＵＬＬ-ＦＵＰＬＥＸ　ＳＹＳＴＥＭＳ　ＢＡＳＥＤ　ＯＮ　ＷＡＶＥ-ＦＩＥ' ＩＥＥＥ　Ｉｎｔｅｒｎａｔｉｏｎａｌ　Ｃｏｎｆｅｒｅｎｃｅ　ｏｎ　Ａｃｏｕｓｔｉｃｓ，　Ｓｐｅｅｃｈ，　ａｎｄ　Ｓｉｇｎａｌ　Ｐｒｏｃｅｓｓｉｎｇ，　２００４　（ＩＣＡＳＳＰ　'０４）Ｖｏｌ．　４, 200405, ｐｐ．ＩＶ-１１７〜ＩＶ-１２０

Attorney, Agent or Firm:

Naoki Nakao
Yukio Nakamura
Munehiro Yoshimura

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