| 摘要 |
PROBLEM TO BE SOLVED: To provide a call device which can prevent howling and be miniaturized, and can obtain a sense of integrity as a system when used as one mode of a functional device in a wiring system. SOLUTION: The call device is provided with a power source connector 11A for receiving power supply from a power source connector 11A' of an extended functional module 10b electrically connected to a power line L1 via a gate device 3; an information connector 11B for exchanging information signals with an information connector 11B' of the extended functional module 10b electrically connected to an information line L2; a speaker SP for outputting voice information transmitted via the information connector 11B; and microphones M1, M2 for transmitting the voice information via the information connector 11B. The microphones M1, M2 each have directivity of a small angle in the same direction as that of a voice to be output from the speaker SP, and have mutually different distances from the speaker SP. COPYRIGHT: (C)2007,JPO&INPIT |
