发明名称 |
Audio distributing system |
摘要 |
A system for distributing signals from an audio source to key telephone station instruments is disclosed. By controlling the impedance relationship between the station instruments, lines and amplifier output, cross-feeding of signals from one station instrument to another or back-feeding of signals to the audio source is prevented.
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申请公布号 |
US4429187(A) |
申请公布日期 |
1984.01.31 |
申请号 |
US19810334189 |
申请日期 |
1981.12.24 |
申请人 |
GTE AUTOMATIC ELECTRIC LABS INC. |
发明人 |
BUTCHER, JAMES S. |
分类号 |
H04H20/76;H04M3/428;(IPC1-7):H04M1/21;H04M1/20 |
主分类号 |
H04H20/76 |
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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