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    • 31. 发明授权
    • Radio communications device incorporating channel guard decode and
priority channel scanning
    • 无线电通信设备包含信道保护解码和优先信道扫描
    • US4984294A
    • 1991-01-08
    • US219125
    • 1988-07-15
    • Michael W. SmithMichael B. Heilman
    • Michael W. SmithMichael B. Heilman
    • H04W88/02
    • H04W88/022
    • A significantly improved scanning method and apparatus is disclosed which allows tone channel guard decode and scan to optimally coexist on the priority channel. In an exemplary embodiment of the present invention, tone channel guard decoding processing is divided into three processing windows. The first window (hereinafter referred to as SHORTLOOK) serves to indicate whether channel guard might be present. If the SHORTLOOK window processing indicates that the correct channel guard might be present, then a further processing window, hereinafter referred to as SECONDLOOK, is initiated. If at anytime during the SECONDLOOK time period, a second predetermined threshold is exceeded, the system is informed that the correct channel guard tone pattern is most probably present. The audio is then unmuted, even though the SECONDLOOK time period expires before the channel guard tone pattern is capable of being reliably detected in accordance with conventional standards. A LASTLOOK window is utilized when the SECONDLOOK window has detected a tone and opens the audio. During the LASTLOOK window, a further tone channel guard detect threshold is monitored. If this threshold is exceeded, then the priority channel audio is allowed to remain active, thereby serving as a check on the determinations made in the SHORTLOOK and SECONDLOOK windows.
    • 公开了一种显着改进的扫描方法和装置,其允许音频信道保护解码和扫描在优先级信道上最佳共存。 在本发明的一个示例性实施例中,音调信道保护解码处理被分为三个处理窗口。 第一个窗口(以下简称“SHORTLOOK”)用于指示信道保护是否存在。 如果SHORTLOOK窗口处理指示可能存在正确的信道保护,则启动进一步的处理窗口(以下称为SECONDLOOK)。 如果在SECONDLOOK时间段期间的任何时间,超过第二预定阈值,则通知系统最可能存在正确的信道保护音调模式。 音频然后被取消静音,即使SECONDLOOK时间段在信道保护音模式能够根据传统标准被可靠地检测之前到期。 当SECONDLOOK窗口检测到音色并打开音频时,将使用LASTLOOK窗口。 在LASTLOOK窗口期间,监视另一个音频信道保护检测阈值。 如果超过此阈值,则允许优先级通道音频保持活动状态,从而作为对在SHORTLOOK和SECONDLOOK窗口中进行的确定的检查。
    • 32. 发明授权
    • Radio trunking system with transceivers and repeaters using special
channel acquisition protocol
    • 具有收发器和中继器的无线中继系统采用专用信道采集协议
    • US4658435A
    • 1987-04-14
    • US721815
    • 1985-04-10
    • Jeffrey S. ChildressMark M. SihlanickMichael W. SmithPeyton L. Morgan, III
    • Jeffrey S. ChildressMark M. SihlanickMichael W. SmithPeyton L. Morgan, III
    • H04W4/10H04W84/08H04B1/40H04B7/15
    • H04W84/08H04W4/10H04W76/005
    • An arrangement for establishing communication between a first mobile radio transceiver and a second mobile radio transceiver through a repeater over a radio frequency channel selected from a plurality of such channels. A repeater distinguishes between two-tone signalling sequences and four-tone signalling sequences by determining the arrival rate over some predefined interval of a received signalling sequence. The repeater transmits a busy signal to alert mobile stations seeking to acquire a channel that the repeater is busy. The repeater interrupts the transmitted busy signal during a portion of the four-tone signalling sequence but not the two-tone signalling sequence to help prevent two-tone mobile stations from falsing on four-tone signalling sequences. The arrangement is thus made compatible with both two-tone signalling and four-tone signalling formats. A calling mobile transceiver may specify the length of signalling transmitted by the repeater, so that the mobile transceiver can cause the repeater to transmit signalling for a duration longer than the mobile transceiver itself would require.
    • 一种用于通过从多个这样的信道中选择的射频信道通过中继器在第一移动无线电收发机和第二移动无线电收发信机之间建立通信的装置。 中继器通过在接收到的信令序列的某个预定间隔上确定到达速率来区分双音信令序列和四音信令序列。 中继器发送忙信号以警告寻求获取中继器正忙的信道的移动站。 中继器在四音信令序列的一部分期间中断传输的忙信号,而不是双音信令序列,以帮助防止双音移动台在四音信令序列上伪造。 因此,该配置与双音信令和四音信令格式兼容。 呼叫移动收发机可以指定由中继器发送的信令的长度,使得移动收发机可以使得中继器在比移动收发器本身需要的持续时间更长的时间内发送信令。