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公开(公告)号：US4127816A
公开(公告)日：1978-11-28
申请号：US710584
申请日：1976-08-02
CPC分类号： H04L1/243
摘要： A master station communicates with remote stations by respective transmit-receive pairs. Quadra-phase modulation is utilized, involving a carrier having two characteristic frequencies not present during bursts of a communicated signal, which bursts are known to last for a fixed duration. Signals on a receive pair are detected, and phase locked loops are tuned to the characteristic frequencies of the carrier and produce logical signals to indicate whether the characteristic frequencies are present. If not, a timer is energized to inhibit institution of a loopback condition for the duration of a data burst, after which the phase locked loops are permitted to enable the loopback.
摘要翻译： 主站通过相应的发送 - 接收对与远程站进行通信。 使用四相调制，涉及具有在通信信号的脉冲串期间不存在的两个特征频率的载波，这些脉冲串已知持续固定持续时间。 检测到接收对上的信号，并且将锁相环调谐到载波的特征频率，并产生逻辑信号以指示特征频率是否存在。 如果没有，定时器被激励以禁止在数据突发的持续时间内产生环回状态，之后允许锁相环使能环回。
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公开(公告)号：US4736939A
公开(公告)日：1988-04-12
申请号：US825323
申请日：1986-02-03
CPC分类号： B65H31/02 , B43M7/02 , B65H29/34 , B65H29/52 , B65H2404/692 , B65H2701/1916
摘要： An envelope transport guide is disclosed that organizes opened and emptied envelopes from an envelope opening machine. The guide has an entry surface coplanar with the pathway of the moving envelopes, and adjacent the opening machine for accepting each envelope. The envelopes turn, under the force of gravity, around some guiding means and slide off the entry surface into an organized stack in an angled collection receptacle.
摘要翻译： 公开了一种信封运输指南，其从信封打开机组织打开的和空的信封。 引导件具有与移动的信封的路径共面的入口表面，并且与打开机器相邻以接受每个信封。 信封在重力作用下转动到一些导向装置周围，并从进入表面滑入成角度收集容器中的有组织的堆叠中。
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