INTERPHONE DEVICE, SERVER, INTERPHONE MANAGEMENT SYSTEM, AND SPEAKING METHOD IN INTERPHONE DEVICE

摘要

PROBLEM TO BE SOLVED: To enable an interphone device which gives notice of a visit to detect there being a visitor by a non-electric method without adding any function nor equipment to an existent interphone.;SOLUTION: A ringing detection sensor 2 which detects a bell ringing from its sound is provided nearby a bell ringing part 33 of the existent interphone device. An interphone main body part 1 recognizes that a visitor presses a bell button 31 through the detection by the ringing detection sensor 2.;COPYRIGHT: (C)2006,JPO&NCIPI