Title:
NURSE CALL SYSTEM
Document Type and Number:
Japanese Patent JP2014158595
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To secure excellent cancelling effect by varying an adjustment value as a parameter exhibiting the cancelling effect of an echo canceler corresponding to the number of active microphones.SOLUTION: In an echo canceler 40 which is connected to a plurality of microphones 3 and a speaker 2 and prevents echo and howling due to acoustic coupling from the speaker 2 to the microphones 3, a register 400 for varying the adjustment value as a parameter exhibiting the cancelling effect corresponding to the number of active microphones 3 is provided.
Inventors:
KUSUNOKI HIROKAZU
SHINKAI TAKASHI
SHINKAI TAKASHI
Application Number:
JP2013030730A
Publication Date:
September 04, 2014
Filing Date:
February 20, 2013
Export Citation:
Assignee:
AIPHONE CO LTD
International Classes:
A61G12/00; H04M1/60; H04M9/08
Domestic Patent References:
JPH06350487A | 1994-12-22 | |||
JPH08150182A | 1996-06-11 | |||
JP2011055104A | 2011-03-17 | |||
JP2007522705A | 2007-08-09 | |||
JP2000196493A | 2000-07-14 |
Foreign References:
WO2005076663A1 | 2005-08-18 | |||
US20110205062A1 | 2011-08-25 | |||
WO2005076663A1 | 2005-08-18 | |||
US20110205062A1 | 2011-08-25 |
Attorney, Agent or Firm:
Moriya Kazuo
Hiromichi Watabe
Hiromichi Watabe