公开(公告)号：US06370150B1

公开(公告)日：2002-04-09

申请号：US09189252

申请日：1998-11-10

申请人： Gerald Höfer ,  Pidder Kassel ,  Ulrich Tomalla

发明人： Gerald Höfer ,  Pidder Kassel ,  Ulrich Tomalla

IPC分类号： H04J1500

CPC分类号： H04Q11/0471

摘要： The S0-interface for ISDN base access connects a four-wire line with a receiver line pair and a transmitter line pair to an ISDN terminal device, subject to potential separation within the interface. Each of the receiver lines has a respective capacitor for potential separation and the transmitter lines have a transformer. An inductance is connected into each receiver line and each transmitter line on the interface side. Preferably, the receiver line pair is connected to a voltage amplifier on the device side. The voltage amplifier has a voltage amplification in the same ratio as the voltage amplification of the transformer in the transmitter line pair.

摘要翻译： 用于ISDN基地接入的S0接口将四线制线路与接收机线路对和发射机线路对连接到ISDN终端设备，在接口内存在潜在的分离。 每个接收器线路具有用于电势分离的相应电容器，并且发射器线路具有变压器。 电感连接到每个接收器线路和接口侧的每个发射器线路。 优选地，接收器线对连接到器件侧的电压放大器。 电压放大器具有与发射器线对中的变压器的电压放大率相同的电压放大。

公开(公告)号：US07010000B1

公开(公告)日：2006-03-07

申请号：US09831478

申请日：1999-11-02

申请人： Gerald Höfer

发明人： Gerald Höfer

IPC分类号： H04J3/12

CPC分类号： H04L43/00 ,  H04L43/10 ,  H04L43/16

摘要： The invention generally relates to a modem connected via a digital interface to a switched public telephone network and to a method for probing the line properties. The modem communicates with a second modem also connected via a digital interface to the same switched public telephone network. The public telephone network may incorporate voice compression devices (ADPCM G.726, G.723 etc.), digital pads (digital attenuators), robbed bit signalling and echo cancelling devices. The probing sequence of the invention uses large amplitude changes in a symbol sequence (each symbol having a duration of 125 μs). After that single amplitude change, the signal may return to the previous value or continue with the new amplitude value for a number of symbols. The number of symbols is selected to be larger than any expected impulse response of a digital impairment of the channel. The amplitude value change must be large enough to produce a sufficient result in the presence of digital pads with or without the presence of RBS.

摘要翻译： 本发明一般涉及通过数字接口连接到交换式公共电话网络的调制解调器和用于探测线路特性的方法。 调制解调器与还经由数字接口连接到同一交换式公用电话网络的第二调制解调器进行通信。 公共电话网络可以包括语音压缩设备（ADPCM G.726，G.723等），数字电话（数字衰减器），抢占位信令和回声消除装置。 本发明的探测序列使用符号序列中的大幅度变化（每个符号的持续时间为125μs）。 在单个幅度变化之后，信号可以返回到先前的值，或者继续用于多个符号的新的幅度值。 选择符号的数量大于信道的数字损伤的任何预期脉冲响应。 振幅值变化必须足够大，以便在存在或不存在RBS的情况下，在存在数字焊盘的情况下产生足够的结果。

公开(公告)号：US06600433B1

公开(公告)日：2003-07-29

申请号：US10009156

申请日：2002-03-12

申请人： Gerald Höfer

发明人： Gerald Höfer

IPC分类号： H03M1300

CPC分类号： H03M13/00 ,  H04J3/125 ,  H04L1/242 ,  H04L25/4927

摘要： Digital code words are transmitted via a digital communication network, e.g. from a digital modem (1) to an analog modem (5). Whenever an RBS technique is used for an RBS channel, a given bit, as a rule the LSB, of a corresponding code word is changed. In order to recognize and correct such RBS channels, training code words transmitted during a training phase are evaluated. If an RBS channel is detected, the given bit of the corresponding code word is set to a fixed value.

摘要翻译： 数字码字通过数字通信网络，例如， 从数字调制解调器（1）到模拟调制解调器（5）。 无论何时使用RBS技术用于RBS通道，相应代码字的给定位（通常为LSB）将被更改。 为了识别和校正这样的RBS信道，评估在训练阶段期间发送的训练码字。 如果检测到RBS信道，则相应代码字的给定位被设置为固定值。

公开(公告)号：US06978007B1

公开(公告)日：2005-12-20

申请号：US09390497

申请日：1999-09-03

申请人： Gerald Höfer ,  Peter Caldera ,  Paul Kunisch

发明人： Gerald Höfer ,  Peter Caldera ,  Paul Kunisch

IPC分类号： H04M3/00 ,  H04M3/40 ,  H04M1/738

CPC分类号： H04M3/005 ,  H04M3/40

摘要： The communications system has a transmission network for transmitting useful data and control data. Call numbers are input at a subscriber terminal. A subscriber line unit with an adjustable transmission characteristic is connected between the subscriber terminal and the transmission network. A recognition unit connected to the transmission network recognizes particular call number patterns and outputs particular control signals corresponding to call number patterns. A control unit connected between the recognition unit and the subscriber line unit sets the transmission characteristic of the subscriber line unit depending on the control signals provided by the recognition unit.

摘要翻译： 通信系统具有传输有用数据和控制数据的传输网络。 呼叫号码在用户终端输入。 具有可调传输特性的用户线路单元连接在用户终端和传输网络之间。 连接到传输网络的识别单元识别特定呼叫号码模式并输出对应于呼叫号码模式的特定控制信号。 连接在识别单元和用户线路单元之间的控制单元根据由识别单元提供的控制信号设置用户线路单元的传输特性。

公开(公告)号：US06658097B2

公开(公告)日：2003-12-02

申请号：US10037465

申请日：2001-12-21

申请人： Gerald Höfer ,  Herbert Zojer ,  Stephan Wimösterer

发明人： Gerald Höfer ,  Herbert Zojer ,  Stephan Wimösterer

IPC分类号： H04M1100

CPC分类号： H04M11/06 ,  H04L25/4927

摘要： Codec circuit for increasing the data transmission rate in a modem transmission with a first programmable digital filter (13) which is connected into a transmission signal path of the Codec circuit, a second programmable digital filter (22) which is connected into a reception signal path of the Codec circuit, a modem signal detection device (31) for detecting whether the transmission signal which is output on the transmission signal path or the reception signal which is received on the reception signal path is a modem signal, the modem signal detection device (31) switching the first and second digital filters (13, 22) to a widened filter bandwidth when a modem signal is detected.