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1. 发明授权

US4430755A Portable radio telephone 失效
标题翻译：便携式收音机
公开(公告)号：US4430755A
公开(公告)日：1984-02-07
申请号：US263797
申请日：1981-05-14
申请人： Mark Nadir , Gordon W. James , William J. Kuznicki , Jerome A. Nieds
发明人： Mark Nadir , Gordon W. James , William J. Kuznicki , Jerome A. Nieds
IPC分类号： H04W4/06 , H04W72/02 , H03J7/18
CPC分类号： H04W88/02 , H04W24/00 , H04W4/06 , H04W72/0413
摘要： A system for radio-telephone communication between a user at a remote location and the commercial telephone system or between two users at remote locations comprises a fixed terminal that is connected by wire lines or the like to the commercial telephone system and a plurality of portable radio units. The terminal is equipped for duplex operation on a plurality of channels, each of which uses separate frequency bands for transmitting and receiving. Each of the portable units is a simplex transceiver adapted to receive on each of the frequencies of transmission from the terminal and to broadcast on each of the frequencies received by the terminal. The terminal places a channel acquisition tone on an unused channel that is the next to be used. The terminal calls portable unit by shifting channel acquisition tone to another channel and broadcasting an identifier to the portable unit. The called portable unit responds to its individual identifier by sounding an audible alert and producing an audible verbal message if one is sent from the terminal. A portable can also originate a message by calling the terminal. A delay period provides time for the portable to recognize its identifier before beginning to scan for channel acquisition tone. Circuits and logic in the portable produce a busy signal if the user attempts to call at a time when the portable is not receiving channel acquisition tone. A reset in the portable unit provides means for the user to terminate the call.
摘要翻译：用于远程位置的用户与商业电话系统之间或远程位置的两个用户之间的无线电话通信系统包括通过有线线路等连接到商用电话系统的固定终端和多个便携式无线电单位。该终端装备在多个信道上进行双工操作，每个信道使用单独的频带进行发送和接收。每个便携式单元是适于从终端接收每个发射频率并在终端接收的每个频率上广播的单工收发器。终端在未使用的通道上放置一个通道采集音，该通道是下一个要使用的通道。终端通过将信道获取音转换到另一频道并将标识符广播到便携式单元来呼叫便携式单元。所呼叫的便携式单元通过发出可听到的警报来响应其个人标识符，并且如果从终端发送了可听见的语音消息则产生可听见的口头消息。便携式还可以通过呼叫终端来发起消息。在开始扫描频道获取音之前，延迟时间提供便携式识别其标识符的时间。如果用户在便携式设备没有接收频道采集音的时候尝试呼叫，则便携式电路和逻辑产生忙信号。便携式单元中的复位提供用于终止呼叫的手段。

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