| 摘要 |
PURPOSE:To attain proper sound volume of output voice by controlling the gain in response to the level of an output signal of an electric signal converting means for converting the ambient noise into an electric signal and changing the sound volume of the output voice of the voice converting means. CONSTITUTION:When a start switch 1 is turned on, a microcomputer 4 stores numerical data outputted to a D/A converter 5 and transmits a control signal 10 to a voice reproducing device 7 to start sound reproduction. When the sound reproducer 7 outputs the reproduced voice to an amplifier 6, the reproducer 7 transmits a reproducing signal 11 to the microcomputer 4 for the notice. The data stored in the microcomputer 4 is data corresponding to the level of the ambient noise collected by a microphone speaker 2 and the larger the level is, the more the gain is increased by the value. Thus, the output voice of the sound reproducer 7 is amplified with a gain in response to the noise level before the start switch 1 is turned on by the amplifier 6 and a voice output is given from the microphone speaker 2. |
