Title:
VOICE CHANGEOVER DEVICE
Document Type and Number:
Japanese Patent JP3709739
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To facilitate a design by which a sufficient transmission reception gain can be obtained, S/N is increased and transmission reception blocking is suppressed.
SOLUTION: In this voice changeover device VS, an instantaneous power estimates value PB of a transmission signal and an instantaneous power estimate value PC of a reception signal are compared with signals PA', PB' obtained by a line feedback gain multiplier means 9 and a sound feedback gain multiplier means 10 receiving the estimate values PB, PC decide a speech state. As a result, since it is not required to take gains of four amplifiers G1-G4 into account in the case of preventing transmission blocking and reception blocking the design by which a sufficient transmission reception gain is obtained, the S/N is increased and the transmission reception blocking is suppressed is facilitated.
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| WO/1991/011060 | ECHO CANCELLER |
| JPS611152 | LOUDSPEAKER TELEPHONE SET |
Inventors:
Minoru Fukushima
Hiroaki Takeyama
Koichi Masuda
Shoji Takemasa
Hiroaki Takeyama
Koichi Masuda
Shoji Takemasa
Application Number:
JP11571299A
Publication Date:
October 26, 2005
Filing Date:
April 23, 1999
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
H04M9/08; H04B3/20; H04M9/10; (IPC1-7): H04M9/08; H04B3/20; H04M9/10
Domestic Patent References:
| JP10190815A | ||||
| JP64094755A | ||||
| JP61148946A | ||||
| JP63063249A |
Attorney, Agent or Firm:
Keisei Nishikawa
Atsuo Mori
Atsuo Mori