Title:
【発明の名称】エコー除去装置
Document Type and Number:
Japanese Patent JP3381112
Kind Code:
B2
Abstract:
An echo removing apparatus for reducing the echo caused by sound generated turning from a speaker round to a microphone of a small-sized sound generated communication terminal, such as a portable telephone. A speaker output signal X(k), sent from a terminal 11 to a speaker 12, is sent to a smoothed power value calculation circuit 21 of a tap coefficient estimation circuit 21 where a smoothed input signal power value Px(k), which is a smoothed version of the square sun values, is found and sent to a tap coefficient updating circuit 22. Using the smoothed input signal power value Px(k), the tap coefficient updating circuit 22 updates tap coefficients of a filter 15. The filter 15 filters the speaker output signal X(k) to output a pseudo echo signal which is sent to a subtractor 14 where it is subtracted from a microphone input signal collected by a microphone 13. The filter tap coefficients may be prohibited form being fluctuated and echo removing characteristics of the echo removing apparatus may be stabilized without increasing the processing volume for tap coefficient estimation.
Inventors:
Akira Inoue
Application Number:
JP5002595A
Publication Date:
February 24, 2003
Filing Date:
March 09, 1995
Export Citation:
Assignee:
ソニー株式会社
International Classes:
H03H21/00; H04B3/23; H04M1/60; H04M9/08; H04R3/02; (IPC1-7): H04B3/23; H03H21/00; H04M1/60
Domestic Patent References:
| JP4119713A | ||||
| JP6338828A | ||||
| JP697711A | ||||
| JP5164815A |
Other References:
Ｋｅｎｓａｋｕ Ｆｕｊｉｉ ａｎｄ Ｊｕｒｏ Ｏｈｇａ，“Ａ ＦＡＳＴ ＡＤＡＰＴＩＶＥ ＡＬＧＯＲＩＴＨＭ ＳＵＩＴＡＢＬＥ ＦＯＲ ＡＣＯＵＳＴＩＣ ＥＣＨＯ ＣＡＮＣＥＬＬＥＲ”，Ｄｅｎｓｈｉ Ｔｏｋｙｏ，日本，ＩＥＥＥ Ｔｏｋｙｏ，１９９５年 ２月，Ｎｏ．３３，ｐｐ．２４４−２４９
Ｋｅｎｓａｋｕ Ｆｕｊｉｉ ａｎｄ Ｊｕｒｏ Ｏｈｇａ，“Ａ Ｆａｓｔ Ａｄａｐｔｉｖｅ Ａｌｇｏｒｉｔｈｍ Ｓｕｉｔａｂｌｅ ｆｏｒ Ａｃｏｕｓｔｉｃ Ｅｃｈｏ Ｃａｎｃｅｌｌｅｒ”，ＩＥＩＣＥ Ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｆｕｎｄａｍｅｎｔａｌｓ ｏｆ Ｅｌｅｃｔｒｏｎｉｃｓ，Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ ａｎｄ Ｃｏｍｐｕｔｅｒ Ｓｃｉｅｎｃｅｓ，日本，１９９２年，Ｖｏｌ．Ｅ７５−Ａ，Ｎｏ．１１，ｐｐ．１５０９−１５１５
Ｋｅｎｓａｋｕ Ｆｕｊｉｉ ａｎｄ Ｊｕｒｏ Ｏｈｇａ，“Ａ Ｆａｓｔ Ａｄａｐｔｉｖｅ Ａｌｇｏｒｉｔｈｍ Ｓｕｉｔａｂｌｅ ｆｏｒ Ａｃｏｕｓｔｉｃ Ｅｃｈｏ Ｃａｎｃｅｌｌｅｒ”，ＩＥＩＣＥ Ｔｒａｎｓａｃｔｉｏｎｓ ｏｎ Ｆｕｎｄａｍｅｎｔａｌｓ ｏｆ Ｅｌｅｃｔｒｏｎｉｃｓ，Ｃｏｍｍｕｎｉｃａｔｉｏｎｓ ａｎｄ Ｃｏｍｐｕｔｅｒ Ｓｃｉｅｎｃｅｓ，日本，１９９２年，Ｖｏｌ．Ｅ７５−Ａ，Ｎｏ．１１，ｐｐ．１５０９−１５１５
Attorney, Agent or Firm:
Akira Koike (2 outside)