| 摘要 |
PROBLEM TO BE SOLVED: To provide a loudspeaking speech apparatus capable of making a speech even at a place such as a bath room with many background noises and a large reverberation. SOLUTION: When a background noise level included in a transmission signal exceeds a threshold value, an operating mode of a voice switch 10 is set to a fixed mode, the sensitivity of the voice switch 10 is corrected and a sound volume of a speaker 2 is increased. As a result, even when a level of various noises produced in the bath room exceeds a prescribed threshold value, since a total loss amount calculation section 14 operated in the fixed mode fixes a total loss to a sufficiently greater initial value, production of unpleasant echo and howling can be suppressed, the voice switch 10 is easily switched from a transmission state to a reception state so as to prevent sole selection of the transmission state due to a high level noise in the bath room, since the sound volume of the speaker 2 is increased, a pleasant speech can be realized. COPYRIGHT: (C)2006,JPO&NCIPI
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