| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice transmission system capable of adjusting a voice output from a voice output means in a proper voice volume independently of a manual operation. SOLUTION: Each of voice terminals 2 is provided with a surrounding noise detection section 28 for detecting a surrounding noise level at an installed place. A control section 25 of each of the voice terminals 2A, 2B increases/decreases an amplification factor of a speaker amplifier 21b in response to the surrounding noise level detected by the surrounding noise detection section 28 to adjust the voice volume. Consequently, a received voice can easily be heard because the voice volume is increased even under an environment wherein the surrounding noise level is high. COPYRIGHT: (C)2008,JPO&INPIT
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