INTERPHONE SYSTEM FOR MULTIPLE DWELLING HOUSE

摘要

PROBLEM TO BE SOLVED: To provide an interphone system for 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 noise components other than frequency band components of the voice can be eliminated by allowing a simultaneous broadcast signal to pass through a band pass filter 42 before the simultaneous broadcast signal is amplified by an amplifier 39 of the sound volume correction section 30, the effect of noise transmitted from a speaker 22 can be reduced by preventing the noise component other than the voice frequency band from being amplified by the amplifier 39. COPYRIGHT: (C)2007,JPO&INPIT