Title:
An echo cancellation device, a meeting system using it, and the echo cancellation method
Document Type and Number:
Japanese Patent JP6064159
Kind Code:
B2
Abstract:
An echo cancellation apparatus is connectable to a speaker configured to output speaker signals and a microphone configured to receive a sound from the speaker and including a plurality of microphone elements. The echo cancellation apparatus includes: a generating unit configured to generate a plurality of sensitivity signals having different sensitivity patterns which represent directionality of the microphone, based on a plurality of microphone signals obtained from the respective microphone signals; a delay estimating unit configured to determine a shortest delay time as an estimated delay time, the shortest delay time being a shortest one of delay times between the speaker signals and the microphone signals, the delay times being obtained from the respective sensitivity signals; and an echo suppressing unit configured to suppress echoes of the plurality of microphone signals using the estimated delay time.
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Inventors:
Shinichi Takayama
Takeshi Nishikawa
Takeshi Nishikawa
Application Number:
JP2012079156A
Publication Date:
January 25, 2017
Filing Date:
March 30, 2012
Export Citation:
Assignee:
Panasonic IP Management Co., Ltd.
International Classes:
H04R3/02; H04N5/225
Domestic Patent References:
| JP2002084212A | ||||
| JP2007166482A | ||||
| JP7075195A | ||||
| JP2002062348A | ||||
| JP2002237769A | ||||
| JP2000341658A |
Foreign References:
| US20080273716 | ||||
| CN101273618A | ||||
| US20020048376 |
Attorney, Agent or Firm:
Kenji Kamada
Hiroo Maeda
Hiroo Maeda