Title:
【発明の名称】ハンズフリー会話機能を有する通話装置
Document Type and Number:
Japanese Patent JP3047300
Kind Code:
B2
Abstract:
This invention relates to a speaking device having a hand-free conversation function which comprises an echo canceler (3) that can cancel the echo given by the direct acoustic coupling between a speaker and a microphone caused by a system comprising the case of the device and the grounded surface thereof and a speech switching circuit (6) in which insertion loss of speech signal is so set that its upper limit is equal to the sufficient attenuation quantity for cancelling the echo caused by the indirect acoustic coupling determined by the spatial state where the speaking device is used. A good speech quality is obtained with the processing circuit of a low cost and small size by assigning the optimum shares of the functions to the echo canceler (3) and the speech switching circuit (6) respectively.
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Inventors:
Juro Ohga
Hiroyuki Masuda
Kensaku Fujii
Yoshihiro Sakai
Hiroyuki Masuda
Kensaku Fujii
Yoshihiro Sakai
Application Number:
JP50479291A
Publication Date:
May 29, 2000
Filing Date:
February 16, 1991
Export Citation:
Assignee:
富士通株式会社
International Classes:
H04M9/08; (IPC1-7): H04M1/60
Domestic Patent References:
| JP561649A | ||||
| JP6424657A |
Attorney, Agent or Firm:
Aoki Akira (3 outside)