发明名称 |
Communication system interconnecting telephone line and single-frequency simultaneous transmission/reception radio system |
摘要 |
A communication system for performing bidirectional communications substantially simultaneously between a telephone line and a radio communication system by using a single-frequency carrier. A base station includes a first radio transceiver and a line connector disposed between the first radio transceiver and the telephone line. A terminal station includes a second radio transceiver. Each of the first and second radio transceivers has a control unit, a transmitter unit including a signal compressor, a synchronizing signal generator and a modulator, and a receiver unit including a signal expander. The control unit sets the line connector to an interconnecting state in response to a connection request signal from the telephone line or the terminal station, while establishes a communication enabling state between the telephone line and the terminal station during a connection processing period. After the communication enabling state has been set up, a speech enabling state is established between the telephone line and the terminal station. The connection processing period is changed over to a speech period after the communication enable state has been established, to thereby allow communication between the telephone line and the terminal station.
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申请公布号 |
US5956650(A) |
申请公布日期 |
1999.09.21 |
申请号 |
US19950501179 |
申请日期 |
1995.07.11 |
申请人 |
HITACHI DENSHI KABUSHIKI KAISHA;TOHOKU ELECTRIC POWER CO., INC. |
发明人 |
SUZUKI, OSAMU;SHIRAISHI, MITSUO;OHIRA, SAKARI |
分类号 |
H04B1/56;H04B1/54;H04W4/10;H04W84/08;(IPC1-7):H04Q7/20 |
主分类号 |
H04B1/56 |
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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