发明名称 |
Audio distribution system |
摘要 |
A signal distribution and communication arrangement controls the broadcast of different types of signals through speakers located in various zones. The system includes a telephone interfaced with a door speaker controller to allow communication between the telephone and a door speaker. A page may be broadcast over the speakers and subsequently muted to allow private communication when the page is answered. Also included is a doorbell interface circuit that responds to a doorbell source. The doorbell source may be activated by any one of a plurality of doorbell switches.
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申请公布号 |
US5363434(A) |
申请公布日期 |
1994.11.08 |
申请号 |
US19920818664 |
申请日期 |
1992.01.09 |
申请人 |
SQUARE D COMPANY |
发明人 |
FARINELLI, ROBERT;STEVENSON, BRUCE B.;UNSELD, BILL R. |
分类号 |
H04M1/723;H04M9/00;H04M9/08;H04M11/02;H04R3/12;H04R5/02;H04R5/04;H04R27/00;(IPC1-7):H04R27/00 |
主分类号 |
H04M1/723 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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