公开(公告)号：EP0155001A3

公开(公告)日：1986-06-11

申请号：EP85102960

申请日：1985-03-14

Applicant: Siemens Aktiengesellschaft

Inventor： Fischer, Günter

IPC: H04L25/38 ,  H04L05/14

CPC classification number: H04L5/143

公开(公告)号：EP0098259A3

公开(公告)日：1985-10-09

申请号：EP83890101

申请日：1983-06-17

Applicant: VOEST-ALPINE Aktiengesellschaft

Inventor： Posch, Reinhard Dr.

IPC: H04L05/14

CPC classification number: G06F13/124 ,  G06F13/4221 ,  H04L5/143

公开(公告)号：EP0054609A3

公开(公告)日：1982-09-22

申请号：EP81105825

申请日：1981-07-23

Applicant: Licentia Patent-Verwaltungs-GmbH

Inventor： Hespelt, Volker, Dr.-Ing. ,  Till, Reinhard, Dr.-Ing.

IPC: H04B03/20 ,  H04B03/14 ,  H04L05/14 ,  H04L25/03

CPC classification number: H04B3/235

公开(公告)号：EP0202596A3

公开(公告)日：1988-08-17

申请号：EP86106554

申请日：1986-05-14

Applicant: SIP Società Italiana per l'Esercizio Telefonico p.a.

Inventor： Ambrosio, Renato ,  Brosio, Alberto ,  Fausone, Alfredo ,  Tofanelli, Adler

IPC: H04L05/14 ,  H04B03/23

CPC classification number: H04L5/1423 ,  H04B3/235

Abstract: The improvements to the system for bidirectional digital transmission with echo-cancellation allow the measurement of the received data signal (4) and the automatic adaptation of the attenuator (SA) and of the line equalizer (EQ). They are implemented by using circuits already present in a conventional system, as well as auxiliary circuits (SL, LC).

公开(公告)号：EP0156654A3

公开(公告)日：1988-06-01

申请号：EP85302233

申请日：1985-03-29

Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA

Inventor： Kamio, Masashi c/o Itami Works of Mitsubishi ,  Fukuda, Shiro c/o Itami Works of Mitsubishi ,  Murakami, Hidenobu c/o Itami Works of Mitsubishi

IPC: H04L05/14 ,  H04L11/00

CPC classification number: H04L29/06 ,  H04L5/1415 ,  H04L13/00

Abstract: A data signal (7) of a'data transmitting station (A) is output to another data transmitting station (B). A data signal (7) from the other station (B) is input to the first-mentioned station (A). Four statuses: transfer progression, transfer completion, reception allowance, and reception completion of each said data signal, are established depending upon signal levels and input/output timings of a single data control signal (8) which is output to the said other station (B) and a single data control signal (9) which is input from that station (B).

公开(公告)号：EP0186142A3

公开(公告)日：1988-03-30

申请号：EP85116260

申请日：1985-12-19

Applicant: GTE LABORATORIES INCORPORATED

Inventor： Cooperman, Michael ,  Sieber, Richard W.

IPC: H04L05/14

CPC classification number: H04L5/1423

Abstract: A two-wire bidirectional transmission system for transmitting electrical signals simultaneously in opposite directions between terminals over a pair of wires wherein the transmitter at one terminal transmits a voltage signal over one of said wires while the transmitter at the second terminal generates a voltage signal over the same wire, the second wire being grounded at each end. Impedance matching resistors, that is resistors matched to the impedance of the two wires, are coupled between each of the transmitters and the wire upon which the voltage signal is generated. A subtractor circuit is provided at each of the terminals for linearly subtracting a signal proportional to one-half of the voltage transmitted and thereby receiving at each terminal a voltage signal equal to one-half of the voltage transmitted by the opposite terminal.

公开(公告)号：EP0184325A3

公开(公告)日：1988-01-07

申请号：EP85307978

申请日：1985-11-04

Applicant: KEYSTONE INTERNATIONAL, INC.

Inventor： Bell, Clifford

IPC: H04L25/48 ,  H04L05/14 ,  H04L07/00 ,  H04Q09/14

CPC classification number: H04L5/1423 ,  H04L7/0083 ,  H04L25/49 ,  H04Q9/14

Abstract: A data system for transmitting multi-state data streams between a data transmitting station (1, 10) and a data receiving station (2), coupled together by a data transmission line (3). Associated with the data transmitting station (1, 10) is an encoder (10) for encoding the data stream prior to transmission and associated with the data receiving station (2) is a decoder (23, 24) for decoding the received signals. The encoder (10) comprises signal generating means (15, 16, 17) which selectively generates a first waveform (Fig. 2(b)(i)) corresponding to the integral of a positive pulse having a negative d.c. offset and a second waveform (Fig. 2(b)(ii)) corresponding to the integral of a negative pulse having a positive d.c. offset. The time average of each waveform and its associated d.c. offsets is substantially zero. The encoder (10) further comprises means (18) for reading the multi-state data stream and for outputting a composite waveform onto the data transmission line (3) consisting of a respective combination of the first and second waveforms for each state read from the multi-state data stream. The decoder (23, 24) comprises a differentiating circuit.

公开(公告)号：EP0156348A3

公开(公告)日：1987-09-02

申请号：EP85103513

申请日：1985-03-25

Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

Inventor： Mogavero Bruno, Carlo ,  Panarotto, Gianfranco ,  Tofanelli, Adler

IPC: H04B03/23 ,  H04L05/14

CPC classification number: H04L5/1423 ,  H04B3/235

Abstract: A system is provided which allows simultaneous interchange of digital information between exchange and subscribers on a single transmission line. Data flows are transmitted by packets separated by short silence intervals within which clock signals are extracted and echo-canceller adjusting is attained. Use of an adaptive equalizer and a single sampling operation per sampling period are possible (Figure 2).

公开(公告)号：EP0169713A3

公开(公告)日：1986-11-12

申请号：EP85305145

申请日：1985-07-18

Applicant: RACAL RESEARCH LIMITED

Inventor： Gill, Trevor Michael

IPC: H04L05/14 ,  H04B01/66

CPC classification number: H04B1/66 ,  H04B1/56 ,  H04J3/1688

Abstract: A system for providing duplex communications between two stations (2,4) is established by means of a voice encoder (12) which is capable of operating at distinct bit rates in dependence on whether or not there is an input voice signal to the voice encoder (12) and whether there is a received voice signal from the other station. The bit rate of the voice encoder (12) is controlled by a control unit (22) including a voice controlled switch. The control unit (22) outputs control data which is transmitted at a low bit rate to the other station. When only one party is speaking that party is allocated most of the channel bandwidth, until he is interrupted by the other party, in which case the channel bandwidth is equally divided between them until the first party stops talking when the other party is allocated most of the bandwidth available.

Abstract translation: 用于提供两个站（2,4）之间的双工通信的系统通过语音编码器（12）建立，语音编码器（12）能够根据是否存在对语音编码器的输入语音信号而以不同的比特率进行操作 （12），以及是否存在来自另一台站的接收到的语音信号。 语音编码器（12）的比特率由包括语音控制开关的控制单元（22）控制。 控制单元（22）将以低比特率发送的控制数据输出到另一个站。 当只有一方正在说该方被分配大部分信道带宽时，直到他被另一方中断，在这种情况下，信道带宽在它们之间被平均分配，直到第一方停止通话时，对方被分配了大部分 带宽可用。

公开(公告)号：EP0118110A3

公开(公告)日：1986-08-06

申请号：EP84102187

申请日：1984-03-01

Applicant: CSELT Centro Studi e Laboratori Telecomunicazioni S.p.A.

Inventor： Gandini, Marco ,  Sartori, Mario

IPC: H04L05/14

CPC classification number: H04L5/1423

Abstract: A digital transceiver for full-duplex transmission of logic signals, comprising a circuit (RTa, RTb, RT') for extracting the signal coming from the remote terminal, which circuit operates on the basis of the voltage present over the line and is driven by the signal generated by the local terminal. The circuit can be manufactured as an intergrated circuit (Fig.1).