| 摘要 |
PROBLEM TO BE SOLVED: To suppress variance in sound volume of simultaneous broadcast among a plurality of house devices and to reduce an influence of noise sent out of a speaker. SOLUTION: Each house device 2 is equipped with a sound volume correcting unit 30 which corrects the sound volume of the simultaneous broadcast to a value within a predetermined range, so the variance in sound volume of the simultaneous broadcast among the plurality of house devices 2 can be suppressed. Further, a voiceless section attenuating unit 42 attenuates an input signal X(n) during detecting a voiceless section, so noise other than a sound signal for simultaneous broadcast is prevented from being amplified by an amplifier 39 to reduce the influence of the noise sent out of the speaker 22. Furthermore, the voiceless section attenuating unit 42 makes a transition time Tm shorter as the amplification degree G increases or a noise level estimated by a noise component estimating unit 44 increases, and then suppresses an increase of the noise during transition from a voiced section to a voiceless section to make the simultaneous broadcast easier to listen to. COPYRIGHT: (C)2008,JPO&INPIT
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