-
1.发明授权
公开(公告)号：US4368361A
公开(公告)日：1983-01-11
申请号：US173011
申请日：1980-07-28
CPC分类号： H04B1/586
摘要： "Transhybrid" loss is maximized in a transmission network of the active canceler type employed to couple receive and transmit unidirectional transmission paths to a bidirectional transmission path including 2-wire loaded type cable by controllably adjusting impedance elements of the canceler circuit in a prescribed sequence including adjustment of a network build out capacitor to obtain amplitude nulls of signals detected on the transmit path while supplying individual ones of a plurality of test signals to the receive path. The test signals include first and second signals having a plurality of equally spaced frequency components in first and second frequency bands, respectively, and a third signal having a predetermined single frequency. The adjustment sequence includes a plurality of iterative adjustments of predetermined impedance elements in predetermined groups until no changes in the impedance settings occur and multiple iterative adjustment of predetermined groups until no changes in the impedance settings occur. The impedance elements to be adjusted and the adjustment sequence are selected to rapidly converge the canceler circuit to an optimum transfer function for generating a correction signal which is substantially a replica of an error signal to be canceled from the transmit path.
摘要翻译： 用于通过以规定的顺序可控地调节消除器电路的阻抗元件将接收和发送单向传输路径耦合到包括2线负载型电缆的双向传输路径的有源消除器类型的传输网络中，“跨混合”损耗最大化，包括 调整网络建立电容器以获得在发送路径上检测到的信号的振幅零点，同时向接收路径提供多个测试信号中的各个测试信号。 测试信号包括分别在第一和第二频带中具有多个等间隔的频率分量的第一和第二信号，以及具有预定单个频率的第三信号。 调整序列包括对预定组中的预定阻抗元件的多次迭代调整，直到发生阻抗设置的变化和预定组的多次迭代调整，直到发生阻抗设置的变化为止。 要调整的阻抗元件和调整序列被选择以将抵消器电路快速收敛到最佳传递函数，用于产生校正信号，校正信号基本上是要从发送路径消除的误差信号的复制品。
-
2.发明授权
公开(公告)号：US4368362A
公开(公告)日：1983-01-11
申请号：US173020
申请日：1980-07-28
摘要： A bidirectional transmission path is typically coupled to unidirectional receive and transmit paths to effect amplification in repeaters or the like. A determination of whether the bidirectional path includes either loaded or nonloaded type 2-wire cable is made by inserting a test signal having a predetermined frequency and a predetermined amplitude into the receive path and measuring the peak amplitude of a transmit signal developed on the transmit path. If the transmit signal peak amplitude is greater than a predetermined threshold value, the 2-wire cable is considered loaded type, and if the transmit signal peak amplitude is less than the threshold value, the 2-wire cable is considered nonloaded type.
摘要翻译： 双向传输路径通常耦合到单向接收和发送路径以在中继器等中实现放大。 通过将具有预定频率和预定幅度的测试信号插入接收路径并测量在发送路径上产生的发送信号的峰值幅度来确定双向路径是否包括加载型或无负载型2线电缆 。 如果发射信号峰值幅度大于预定阈值，则2线电缆被认为是加载类型，如果发射信号的峰值幅度小于阈值，则2线电缆被认为是无负载型。
-
3.发明授权
公开(公告)号：US4365119A
公开(公告)日：1982-12-21
申请号：US173014
申请日：1980-07-28
CPC分类号： H04B3/238
摘要： "Transhybrid" loss is maximized in a transmission network of the active canceler type employed to couple receive and transmit unidirectional transmission paths to a bidirectional transmission path including 2-wire nonloaded type cable by controllably adjusting impedance elements of the canceler circuit in a prescribed sequence to obtain amplitude nulls of signals detected on the transmit path while supplying individual ones of a plurality of single frequency test signals to the receive path. The adjustment sequence comprises a first procedure including a plurality of iterative adjustments of predetermined impedance elements in predetermined groups until no changes in the impedance settings occur and multiple iterative adjustment of predetermined groups until no changes in the impedance settings occur. If frequencies become equal at which poles and zeros occur associated with predetermined ones of the impedance elements, the impedance values of those elements are fixed in prescribed relationship and a second procedure is employed to adjust others of the canceler elements. The impedance elements to be adjusted and the adjustment sequence are selected to rapidly converge the canceler circuit to an optimum transfer function for generating a correction signal which is substantially a replica of an error signal to be canceled from the transmit path.
摘要翻译： 用于将接收和发送单向传输路径耦合到包括2线无负载型电缆的双向传输路径的有源消除器类型的传输网络中，“跨混合”损耗最大化，可以通过以规定的顺序可控地调节消除器电路的阻抗元件， 获得在发送路径上检测到的信号的振幅零点，同时向接收路径提供多个单频测试信号中的单个频率测试信号。 调整序列包括第一程序，其包括预定组中预定阻抗元件的多次迭代调整，直到发生阻抗设置的变化和预定组的多次迭代调整，直到发生阻抗设置的变化为止。 如果与预定的阻抗元件相关联的极点和零点发生频率变得相等，则这些元件的阻抗值以规定的关系固定，并且采用第二过程来调节其它的加速器元件。 要调整的阻抗元件和调整序列被选择以将抵消器电路快速收敛到最佳传递函数，用于产生校正信号，校正信号基本上是要从发送路径消除的误差信号的复制品。
-
公开(公告)号：US4074087A
公开(公告)日：1978-02-14
申请号：US714306
申请日：1976-08-16
摘要： Hybridless bidirectional transmission networks typically include telephone line coupling transformers and unidirectional amplifiers for enhancing outgoing and incoming signals. Unwanted signal components in the outgoing direction, caused by cross coupling via the transformer of incoming signals, are minimized by employing a canceller network in circuit with the incoming and outgoing amplifiers. The canceller network has a complex transfer characteristic to compensate substantially for complex impedance components of the coupling transformer and 2-wire transmission facility and to generate a signal which is substantially a replica of the unwanted outgoing signal components. The replica signal and unwanted signal components are algebraically combined in the outgoing amplifier effectively to eliminate the unwanted signal components from the outgoing path. In a first embodiment the canceller network has an attenuation versus frequency characteristic yielding a prescribed second-order complex transfer characteristic while in a second embodiment the canceller network has an attenuation versus frequency characteristic yielding a prescribed fourth-order complex transfer characteristic. In the second embodiment values of predetermined pole-zero pairs are selectively adjustable to match impedance components of different 2-wire transmission facilities.
摘要翻译： 无混合双向传输网络通常包括用于增强输出和输入信号的电话线耦合变压器和单向放大器。 通过使用输入和输出放大器的电路中的消除网络，在输出方向上的不需要的信号分量通过输入信号的变压器的交叉耦合引起的最小化。 消除器网络具有复杂的传输特性，用于基本上补偿耦合变压器和2线传输设施的复杂阻抗分量，并产生基本上是不需要的输出信号分量的复制品的信号。 复制信号和不需要的信号分量有效地代表性地组合在输出放大器中，以消除来自输出路径的不需要的信号分量。 在第一实施例中，消除器网络具有产生规定的二阶复数传递特性的衰减对频率特性，而在第二实施例中，消除器网络具有产生规定的四阶复数传递特性的衰减对频率特性。 在第二实施例中，预定极 - 零对的值可选择性地可调，以匹配不同2线传输设施的阻抗分量。
-
-
-
搜索结果
4 条记录 (耗时 0.021 秒)
