| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone system for a multiple dwelling house that can suppress variations in the sound volume of simultaneous broadcast among a plurality of dwelling unit machines. SOLUTION: Since each dwelling unit machine 2 is provided with a sound volume correction section 30 that corrects the sound volume of the simultaneous broadcast to be kept within a prescribed range, variations in the sound volume among the dwelling unit machines 2 can be suppressed. Further, since a silence interval attenuation section 42 of the sound volume correction section 30 detects a silence interval of an input signal X(n) including a simultaneous broadcast voice signal and attenuates the input signal X(n) while detecting the silence interval, the sound volume correction section 30 prevents noise components other than the simultaneous broadcast voice signal from being amplified by an amplifier 39 and can reduce the effect of noise transmitted from the speaker 22. COPYRIGHT: (C)2007,JPO&INPIT
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