公开(公告)号：US4115668A

公开(公告)日：1978-09-19

申请号：US792096

申请日：1977-04-29

申请人： Ambroz K. Skrovanek ,  Fred E. Clark, Jr.

发明人： Ambroz K. Skrovanek ,  Fred E. Clark, Jr.

IPC分类号： H04B3/20

CPC分类号： H04B3/20

摘要： An interface unit for a four wire telephone circuit includes an echo suppressor. A filter circuit is connected to the transmit line drop side to detect voice and SF signals and to selectively couple a regenerated SF signal and the voice signal to the line side of the transmit line. A passive filter is selectively coupled to the receive side to attentuate voice echo but bypass SF signals.

摘要翻译： 用于四线电话电路的接口单元包括回波抑制器。 滤波器电路连接到发射线路降侧，以检测语音和SF信号，并将再生的SF信号和语音信号选择性地耦合到发射线的线路侧。 无源滤波器选择性地耦合到接收侧以注意声音回声但是旁路SF信号。

公开(公告)号：US4438408A

公开(公告)日：1984-03-20

申请号：US408900

申请日：1982-08-17

申请人： Ambroz K. Skrovanek ,  Carl A. Evert

发明人： Ambroz K. Skrovanek ,  Carl A. Evert

IPC分类号： H03G3/04 ,  H03H11/24 ,  H03G1/00 ,  H03H7/24

CPC分类号： H03H11/24 ,  H03G3/04

摘要： Disclosed is an apparatus having a signal attenuating portion for setting the gain or loss in amplitude of an electrical signal received by the apparatus, and alternatively, provides a gain of unity without a change of setting. The apparatus employs a plurality of switching devices which may be selectively opened and closed to provide the apparatus with a fixed gain of unity and alternatively predetermined losses or gains to the input signals.

摘要翻译： 公开了一种具有信号衰减部分的装置，用于设置由装置接收的电信号的幅度的增益或损失，或者提供一致的增益而不改变设置。 该装置采用多个开关装置，这些开关装置可以选择性地打开和关闭，以向装置提供固定的单位增益和对输入信号的预定的损失或增益。

公开(公告)号：US4147900A

公开(公告)日：1979-04-03

申请号：US785680

申请日：1977-04-07

申请人： Mauro L. Gaetano ,  Ambroz K. Skrovanek

发明人： Mauro L. Gaetano ,  Ambroz K. Skrovanek

IPC分类号： H04B3/08

CPC分类号： H04B3/08

摘要： A telephone network protective coupler for connecting terminal equipment to a telephone central office by means of a telephone line. The coupler includes two hybrid circuits which are interconnected to form a transmitting path and a receiving path. A power limiter in the transmitting path can be programmed remotely by selection of an external programming resistor without the direct introduction of noise into the transmitting path. The programming feature permits the gain of the transmitting portion of the device to be varied in steps from 0 to -12dB., and the maximum power output to be varied correspondingly in steps from 0 to -12 dBm. in order to arrive at an optimum signal power level of -12dBm. at the central office. The power limiter includes a controller gain amplifier for varying the attenuation of the transmitting path to a.c. signals, a remotely adjustable attenuator connected to a d.c. voltage source, and a gain control circuit connected to the amplifier and to the attenuator and responsive to adjustment of the attenuator for controling the gain of the amplifier. The power limiter further includes a rectifier for rectifying the a.c. signals after passage through the amplifier, and a maximum power control circuit connected to the rectifier and the attenuator and responsive to the adjustment of the attenuator for keeping the ratio of the amplitude of the rectified a.c. signals to the output voltage of the attenuator less than or substantially equal to a fixed constant.

摘要翻译： 一种电话网络保护耦合器，用于通过电话线将终端设备连接到电话中心局。 耦合器包括互连以形成传输路径和接收路径的两个混合电路。 传输路径中的功率限制器可以通过选择外部编程电阻器进行远程编程，而不会将噪声直接引入到传输路径中。 编程功能允许器件的发送部分的增益从0到-12dB的步进变化，并且最大功率输出将相应地从0变化到-12dBm。 以达到-12dBm的最佳信号功率电平。 在中央办公室。 功率限制器包括一个控制器增益放大器，用于将发送路径的衰减改变为a.c. 信号，一个远程可调衰减器连接到直流 电压源和连接到放大器和衰减器的增益控制电路，并响应衰减器的调节来控制放大器的增益。 功率限制器还包括整流器，用于整流交流 通过放大器的信号，以及连接到整流器和衰减器的最大功率控制电路，并且响应于衰减器的调整，以保持整流的交流电压的幅度比。 信号到衰减器的输出电压小于或基本上等于固定常数。

公开(公告)号：US4110711A

公开(公告)日：1978-08-29

申请号：US766588

申请日：1977-02-08

申请人： Maur L. Gaetano ,  Ambroz K. Skrovanek

发明人： Maur L. Gaetano ,  Ambroz K. Skrovanek

IPC分类号： H03H7/38

CPC分类号： H03H7/38

摘要： A transmission line having a fixed characteristic impedance, e.g., 600 ohms, is coupled to a receiver through an input transformer working into a very small impedance, e.g., 10 ohms or less. As compared to a conventional arrangement, where an input transformer works into a load nearly as high as the characteristic impedance of the line, the new arrangement has considerably better low frequency response and delay distortion characteristics. The new arrangement permits a much smaller transformer to be used if desired while retaining favorable low frequency response and delay distortion characteristics.

摘要翻译： 具有固定特性阻抗（例如600欧姆）的传输线通过工作在非常小的阻抗（例如10欧姆或更小）的输入变压器耦合到接收器。 与传统布置相比，其中输入变压器工作在几乎与线的特性阻抗一样高的负载中，新布置具有相当好的低频响应和延迟失真特性。 如果需要，新的布置允许使用小得多的变压器，同时保持有利的低频响应和延迟失真特性。