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1. 发明授权

US4326287A Two wire bi-directional digital telephone link 失效
标题翻译：双线双向数字电话链路
公开(公告)号：US4326287A
公开(公告)日：1982-04-20
申请号：US164452
申请日：1980-06-30
申请人： Paul Abramson
发明人： Paul Abramson
IPC分类号： H04M11/06 , H04J3/06 , H04L5/14 , H04L5/16 , H04L7/033 , H04L7/04 , H04L25/02 , H04M11/00 , H04Q11/04
CPC分类号： H04Q11/04 , H04L5/1476 , H04J3/0638 , H04L7/033 , H04L7/044
摘要： This invention details a baseband bipolar pulse signaling technique employing only two wires for simultaneous bi-directional communications. A first polarity of pulses is utilized for communication of traffic in one direction; traffic in the return direction utilizes pulses of the opposite polarity. Each end of the communication link has both a sender and a receiver. One sender arbitrarily transmits only positive pulses; the receiver at this end of the system will recognize only negative pulses. The inverse set of conditions is enforced at the opposite end of the link. Means are included for synchronizing the application of pulses to the link at the other end in response to the receipt of pulses at that end to avoid overlap of receive pulses at the originating end of the line.
摘要翻译：本发明详细描述了仅使用两条线来同步双向通信的基带双极脉冲信令技术。脉冲的第一极性用于在一个方向上的通信通信; 返回方向的交通使用相反极性的脉冲。通信链路的每一端都具有发送者和接收者。一个发送者任意发送正脉冲; 系统这端的接收器只能识别负脉冲。在链接的另一端强制执行相反的条件集。包括用于响应于在该端处接收到脉冲来同步脉冲施加到另一端的链路的装置，以避免线路起始端的接收脉冲的重叠。

2. 发明授权

US4814634A Ternary signal multiplexor circuit 失效
标题翻译：三进制信号多路复用器电路
公开(公告)号：US4814634A
公开(公告)日：1989-03-21
申请号：US100061
申请日：1987-09-23
申请人： Paul Abramson , David E. Conner , Lee C. Haas
发明人： Paul Abramson , David E. Conner , Lee C. Haas
IPC分类号： H04J3/00 , H03K17/16 , H03K17/60 , H03K17/62 , H04J3/02 , H04J3/04 , H03K17/56 , H04L5/16
CPC分类号： H03K17/16 , H03K17/601 , H03K17/6242
摘要： The multiplexing circuit disclosed herein combines multiple input signals into a common output by allowing ternary signals to pass from multiple input circuits to a common output circuit. The circuit combines ternary signals with minimum feedback between input circuits. The circuit is passive, has minimum attenuation, and a small number of components.

3. 发明授权

US4005276A Digital voice signaling with digital echo detection and voice activity compression used to cancel echo 失效
标题翻译：具有数字回声检测和语音活动压缩的数字语音信号用于消除回波
公开(公告)号：US4005276A
公开(公告)日：1977-01-25
申请号：US560423
申请日：1975-03-20
申请人： Paul Abramson , Ulrich Appel
发明人： Paul Abramson , Ulrich Appel
IPC分类号： H04J3/17 , H04B3/20
CPC分类号： H04B3/20
摘要： A connection system for varied distance digital communication capable of handling telephone signals utilizes Voice Activity Compression (VAC) to effectively share a given number of digital transmission channels among a greater number of virtual telephone connections. The telephone signals are delta-modulated and demodulated in system connection stations. The VAC processing circuits with a small increment of decision logic provide echo suppression. Echo suppression is thereby rendered as a "value-added" service at a relatively small increment of station cost over the cost of VAC processing. Echo interference with original telephone signal activity in the send channels is reduced by digital control of gain in the demodulation stage. The system also provides connections without VAC handling subject to echo control.
摘要翻译：用于处理电话信号的不同距离数字通信的连接系统利用语音活动压缩（VAC）在更多数量的虚拟电话连接中有效地共享给定数量的数字传输信道。电话信号在系统连接站中进行增量调制和解调。具有小增量决策逻辑的VAC处理电路提供回波抑制。因此，以VAC处理成本为基础，以台站成本相对较小的增量将回波抑制作为“增值”服务。通过对解调阶段增益的数字控制，减少了发送信道中原始电话信号的回波干扰。该系统还提供无VAC处理的连接，可进行回波控制。

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