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1. 发明授权

US4608699A Simulcast transmission system 失效
标题翻译：联播传输系统
公开(公告)号：US4608699A
公开(公告)日：1986-08-26
申请号：US453846
申请日：1982-12-27
申请人： Percy P. Batlivala , Christopher N. Kurby
发明人： Percy P. Batlivala , Christopher N. Kurby
IPC分类号： H04H20/67 , H04L27/10
CPC分类号： H04H20/67 , H04L27/10
摘要： An improved simulcast transmission in which a signal transmitted by a master station provides a reference frequency signal, as well as a voice and data path, is described. The system can be configured such that a master station can transmit AFSK data and voice or FSK data and voice. In either case, the remote transmitter will retransmit FSK and voice.
摘要翻译：描述了由主站发送的信号提供参考频率信号以及语音和数据路径的改进的联播传输。可以配置系统，使得主站可以发送AFSK数据和语音或FSK数据和语音。在任一情况下，远程发射机将重发FSK和语音。

2. 发明授权

US4475246A Simulcast same frequency repeater system 失效
标题翻译：同步中频同步系统
公开(公告)号：US4475246A
公开(公告)日：1984-10-02
申请号：US451676
申请日：1982-12-21
申请人： Percy P. Batlivala , Richard S. Kommrusch
发明人： Percy P. Batlivala , Richard S. Kommrusch
IPC分类号： H04B1/52 , H04H20/67 , H04B7/14
CPC分类号： H04H20/67 , H04B1/525 , H04B7/15542 , H04B7/15564 , H04B7/1555
摘要： The simulcast communication system includes a transmitting station for transmitting a first signal at a given frequency and a same frequency repeater (SFR) having a receiver for receiving the first signal and a transmitter for retransmitting the received signal at the same given frequency. The SFR rebroadcasts the received signal with a time delay of T. The receiver of the SFR receives the retransmitted signal as a spillover signal. A mechanism is coupled to the transmitting station for generating a second signal which consists of the first signal delayed in time by T1 which is approximately equal to T. Another mechanism coupled to the SFR substantially cancels the spillover signal and the second signal since the second signal is in phase with the spillover signal. Thus, the signal retransmitted by the SFR differs in phase from the second signal transmitted by the transmitting station only by the propagation delay between the SFR and the transmitting station, whereby the likelihood that a mobile unit will experience simulcast distortion due to the reception of the second signal and the retransmitted signal can be minimized. This invention further contemplates that multiple SFR's may be employed wherein each SFR includes a mechanism for cancelling any other retransmitted signals by other SFR's as received at each SFR.
摘要翻译：联播通信系统包括用于以给定频率发送第一信号的发送站和具有用于接收第一信号的接收机的相同频率中继器（SFR）和用于以相同给定频率重发接收信号的发射机。 SFR以T的时间延迟重播广播接收到的信号。SFR的接收机接收重传的信号作为溢出信号。一种机制耦合到发射台，用于产生第二信号，该第二信号由时间延迟大约等于T的T1组成。另一种耦合到SFR的机制基本上消除了溢出信号和第二信号，因为第二信号与溢出信号同步。因此，由SFR重传的信号与发送站发送的第二信号的相位不同，SFR与发送站之间的传播延迟不同，因此移动单元将因接收到可以使第二信号和重发信号最小化。本发明进一步考虑可以采用多个SFR，其中每个SFR包括用于在每个SFR处接收到的其他SFR消除任何其他重发信号的机制。

3. 发明授权

US4479245A Same frequency repeater for a multiple repeater system 失效
标题翻译：用于多中继器系统的相同频率中继器
公开(公告)号：US4479245A
公开(公告)日：1984-10-23
申请号：US451678
申请日：1982-12-21
申请人： Percy P. Batlivala , Richard S. Kommrusch
发明人： Percy P. Batlivala , Richard S. Kommrusch
IPC分类号： H04B7/155 , H04B7/14
CPC分类号： H04B7/15542
摘要： This invention is directed to a same frequency repeater (SFR) for use in a multiple SFR system in which only one SFR at a given time is allowed to retransmit a received signal thereby preventing simulcast distortion which could occur due to multiple SFR retransmissions. The SFR includes a receiver for receiving a signal carrying information at a given frequency and a transmitter for rebroadcasting the received signal at the given frequency. A mechanism is provided for keying the transmitter upon the reception of a received signal. A detector senses if a predetermined pilot tone is carried by the received signal. A mechanism responsive to the detection of the pilot tone inhibits the keying of the transmitter if the pilot tone is detected before the transmitter is keyed. A tone generator encodes the output signal of the transmitter with the pilot tone. The keying mechanism preferably delays the keying of the transmitter for a time period having a duration inversely proportional to the magnitude of the received signal in response to a mechanism which senses the magnitude of the received signal. The present invention further contemplates a method for the operation of such an SFR.
摘要翻译：本发明涉及一种在多重SFR系统中使用的相同频率中继器（SFR），其中在给定时间只允许一个SFR重发接收信号，从而防止由于多次SFR重传而可能发生的同播失真。 SFR包括用于接收以给定频率携带信息的信号的接收机和用于以给定频率重新广播接收信号的发射机。提供了一种在接收到接收到的信号时对发射机进行键控的机制。检测器感测到所接收的信号是否承载预定的导频音。如果在发射机被键入之前检测到导频音，则响应于导频音的检测的机制禁止发射机的键控。音调发生器用导频音对发射机的输出信号进行编码。键控机构响应于感测接收信号的幅度的机制，优选地将发射机的键控延迟持续时间的持续时间与接收信号的幅度成反比的持续时间。本发明进一步考虑了一种用于操作这种SFR的方法。

4. 发明授权

US4475243A Isolation method and apparatus for a same frequency repeater 失效
标题翻译：相同频率中继器的隔离方法和装置
公开(公告)号：US4475243A
公开(公告)日：1984-10-02
申请号：US451984
申请日：1982-12-21
申请人： Percy P. Batlivala , Richard S. Kommrusch , Ronald H. Chapman
发明人： Percy P. Batlivala , Richard S. Kommrusch , Ronald H. Chapman
IPC分类号： H04B7/015 , H04B7/14 , H04B7/15 , H04B7/155
CPC分类号： H04B7/15564 , H04B1/525
摘要： An apparatus for minimizing the spillover signal from the transmitter to the receiver in a same frequency repeater includes a mechanism for generating a receiver first injection signal carrying the modulation component of the transmitter signal, and a first mixer for mixing the received signals and the first injection signal to produce a first IF signal having one unmodulated IF component signal and another modulated IF component signal. A correlation and cancellation circuit is utilized to cancel the unmodulated IF component signal. A mechanism is provided for generating a second injection signal which carries the modulation component of the transmitter signal. A second mixer mixes the first IF signal and the second injection signal to produce a second IF signal such that the modulation component of the spillover signal is substantially cancelled. Time synchronization mechanisms are preferably provided to adjust the phase of the modulation component of the transmitted signal as carried by the first and second injection signals such that it arrives at the first and second mixers in phase synchronization with the modulation component of the spillover signal. This invention also contemplates a method for canceling the modulation component of the spillover signal.
摘要翻译：一种用于在相同的频率转发器中将从发射机到接收机的溢出信号最小化的装置包括用于产生承载发射机信号的调制分量的接收机第一注入信号的机制，以及用于混合接收信号和第一次注入的第一混频器信号以产生具有一个未调制IF分量信号和另一个调制IF分量信号的第一IF信号。利用相关和消除电路来消除未调制的IF分量信号。提供了一种用于产生承载发射机信号的调制分量的第二注入信号的机制。第二混频器混合第一IF信号和第二注入信号以产生第二IF信号，使得溢出信号的调制分量基本上被消除。优选地提供时间同步机制以调整由第一和第二注入信号携带的发射信号的调制分量的相位，使得其与溢出信号的调制分量相位同步到达第一和第二混频器。本发明还考虑了一种用于消除溢出信号的调制分量的方法。

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