RO82015B - Procedeu si circuit de linie pentru interfatarea unui canal de abonat, bidirectional, care transmite semnale de comunicatie analoge cu un circuit digital - Google Patents

Procedeu si circuit de linie pentru interfatarea unui canal de abonat, bidirectional, care transmite semnale de comunicatie analoge cu un circuit digital

Info

Publication number
RO82015B
RO82015B RO93364A RO9336478A RO82015B RO 82015 B RO82015 B RO 82015B RO 93364 A RO93364 A RO 93364A RO 9336478 A RO9336478 A RO 9336478A RO 82015 B RO82015 B RO 82015B
Authority
RO
Romania
Prior art keywords
digital
signals
circuit
bidirectional
interface
Prior art date
Application number
RO93364A
Other languages
English (en)
Other versions
RO82015A (ro
Inventor
Robert Treiber
Original Assignee
International Standard Electric Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corporation filed Critical International Standard Electric Corporation
Publication of RO82015B publication Critical patent/RO82015B/ro
Publication of RO82015A publication Critical patent/RO82015A/ro

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/005—Interface circuits for subscriber lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/56—Balancing circuitry switched-on automatically in dependence on automatically-selected lines

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Bidirectional Digital Transmission (AREA)
  • Communication Control (AREA)

Abstract

Procedeu pentru interfatarea a cel putin un singur canal de abonat, bidirectional, care transmite semnale de comunicatie analoge cu un circuit digital, caracterizat prin aceea ca, cuprinde urmatoarele etape: convertirea semnalelor de comunicatie analoge, în semnale digitale, atenuarea selectiva a semnalelor digitale de la convertorul analog-digital prin scaderea din ele a semnalelor digitale aditionale care reprezinta semnale nedorite prezente în canal, astfel ca se obtine un semnal de iesire digital compus care reprezinta semnale de comunicatie analoage care au rezultat deci din combinarea semnalelor digitale de iesire cu semnale digitale aditionale, cuplarea semnalului de iesire digital compus la circuitul digital astfel ca semnalele de comunicatie nedorite sunt eliminate din semnalul de iesire digital compus.
RO7893364A 1977-03-02 1978-04-01 Procedeu si circuit de linie pentru interfatarea unui canal de abonatbidirectional care transmite semnale de comunicatie analoge cu un circuit digital RO82015A (ro)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77371377A 1977-03-02 1977-03-02

Publications (2)

Publication Number Publication Date
RO82015B true RO82015B (ro) 1984-06-25
RO82015A RO82015A (ro) 1984-09-29

Family

ID=25099087

Family Applications (1)

Application Number Title Priority Date Filing Date
RO7893364A RO82015A (ro) 1977-03-02 1978-04-01 Procedeu si circuit de linie pentru interfatarea unui canal de abonatbidirectional care transmite semnale de comunicatie analoge cu un circuit digital

Country Status (35)

Country Link
US (1) US4161633A (ro)
JP (1) JPS53134308A (ro)
AR (1) AR232064A1 (ro)
AT (1) AT375231B (ro)
AU (1) AU512524B2 (ro)
BE (1) BE864425R (ro)
BR (1) BR7801291A (ro)
CA (1) CA1096522A (ro)
CH (1) CH639806A5 (ro)
DD (1) DD134904A5 (ro)
DE (1) DE2808737C2 (ro)
DK (1) DK151434B (ro)
EG (1) EG13334A (ro)
ES (1) ES467422A1 (ro)
FI (1) FI74180C (ro)
FR (1) FR2382815B1 (ro)
GB (2) GB1583634A (ro)
GR (1) GR64131B (ro)
HK (1) HK46781A (ro)
HU (1) HU182505B (ro)
IE (1) IE46567B1 (ro)
IN (1) IN149976B (ro)
IT (1) IT1115591B (ro)
MX (1) MX145171A (ro)
NL (1) NL191006C (ro)
NO (1) NO150380C (ro)
NZ (1) NZ186579A (ro)
PL (1) PL125418B1 (ro)
PT (1) PT67724A (ro)
RO (1) RO82015A (ro)
SE (2) SE439084B (ro)
SU (1) SU1191001A3 (ro)
TR (1) TR20458A (ro)
YU (1) YU41471B (ro)
ZA (1) ZA781059B (ro)

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US4349703A (en) * 1980-03-31 1982-09-14 International Telephone And Telegraph Corporation Programmable ring signal generator
JPH0477493B2 (ro) * 1980-06-18 1992-12-08 Advanced Micro Devices Inc
US4351060A (en) * 1980-10-23 1982-09-21 International Telephone And Telegraph Corporation Automatic, digitally synthesized matching line terminating impedance
US4377858A (en) * 1980-10-23 1983-03-22 International Telephone And Telegraph Corporation Digital two-to-four wire converter for full duplex signals
US4381561A (en) * 1980-10-23 1983-04-26 International Telephone And Telegraph Corporation All digital LSI line circuit for analog lines
US4406004A (en) * 1980-11-05 1983-09-20 Anaconda-Ericsson, Inc. Ring scheduling apparatus for a digital multiplexed telecommunication system
US4393491A (en) * 1980-11-05 1983-07-12 Anaconda-Ericsson Automatic self-test system for a digital multiplexed telecommunication system
US4394743A (en) * 1980-12-18 1983-07-19 Bell Telephone Laboratories, Incorporated Tone generation method and apparatus using stored reference calibration coefficients
US4509037A (en) * 1981-06-12 1985-04-02 Gould Inc. Enhanced delta modulation encoder
CA1184660A (en) * 1981-06-12 1985-03-26 Robert W. Harris Enhanced delta modulation encoder
US4431868A (en) * 1981-07-09 1984-02-14 International Telephone And Telegraph Corporation Solid state telephone line interface circuit with ringing capability
JPS5854773A (ja) * 1981-09-28 1983-03-31 Nec Corp 加入者回路
DE3207677C2 (de) * 1982-03-03 1985-08-08 Siemens AG, 1000 Berlin und 8000 München Schaltungsanordnung zur Abwicklung von Zusatzfunktionen im Zusammenhang mit Grundbaugruppen bildenden Anschlußschaltungen
US4554416A (en) * 1983-03-08 1985-11-19 The United States Of America As Represented By The Secretary Of The Air Force Low voltage two wire to four wire telephone circuit converter apparatus
JPS61225929A (ja) * 1985-03-30 1986-10-07 Fujitsu Ltd デイジタルト−ンの生成方法
US4761812A (en) * 1985-12-10 1988-08-02 U.S. Holding Company, Inc. Constant power telephone line circuit
AR241360A1 (es) * 1986-06-30 1992-05-29 Siemens Ag Disposicion de circuito para desconectar los hilos de una linea de conexion de abonado de una red telefonica digital tiempo-multiplex con respecto a un circuito de alimentacion.
US4989221A (en) * 1987-03-30 1991-01-29 Codex Corporation Sample rate converter
EP0286835B1 (de) * 1987-04-14 1992-01-15 Siemens Aktiengesellschaft Verfahren und Schaltungsanordnung zur Einstellung der Teilnehmerleitungs-Nachbildungsimpedanzen von programmierbaren Gabelschaltung
US4809324A (en) * 1987-07-27 1989-02-28 Siemens Transmission Systems, Inc. Subscriber line interface circuit (SLIC) isolation from lighting-induced ground overshoots
US4924511A (en) * 1988-12-16 1990-05-08 Siemens Transmission Systems, Inc. Ring signal generator for generating ring signals of different frequencies and power levels in response to user selection
US4928306A (en) * 1989-02-28 1990-05-22 International Business Machines Corporation Dynamically configurable telephone
US4908857A (en) * 1989-05-22 1990-03-13 Siemens Transmission Systems, Inc. Isolated drive circuit
DE59003361D1 (de) * 1990-03-27 1993-12-09 Siemens Ag Zweidraht-Vierdraht-Umsetzer.
EP0448753B1 (de) * 1990-03-27 1993-11-03 Siemens Aktiengesellschaft Zweidraht-Vierdraht-Umsetzer
US5103387A (en) * 1991-01-31 1992-04-07 Northern Telecom Limited High voltage converter
DE19611941C1 (de) * 1996-03-26 1997-12-11 Siemens Ag Schaltungsanordnung zur Leitungsanpassung und Echounterdrückung
US6343126B1 (en) 1996-03-27 2002-01-29 Hello Direct, Inc. Method and apparatus for interfacing analog telephone apparatus to a digital, analog or hybrid telephone switching system
US5912964A (en) * 1996-03-27 1999-06-15 Hello Direct, Inc. Adaptive telephone handset interface
US5892823A (en) * 1996-03-27 1999-04-06 Hello Direct, Inc. Smart interface technology
US5815569A (en) * 1996-06-27 1998-09-29 Lucent Technologies Inc. Method for controlling power losses associated with line interface circuits in telecommunications networks
US7031454B1 (en) 1997-11-06 2006-04-18 Hello Direct, Inc. Method and apparatus for interfacing telephone apparatus to a digital, analog or hybrid telephone switching system
US6115469A (en) * 1998-08-25 2000-09-05 Unitrode Corporation Telephone line ring signal and DC power generator
US6573729B1 (en) * 2000-08-28 2003-06-03 3Com Corporation Systems and methods for impedance synthesis
US20070230355A1 (en) * 2006-03-30 2007-10-04 Advantest Corporation Test apparatus and test method
US8395434B1 (en) 2011-10-05 2013-03-12 Sandisk Technologies Inc. Level shifter with negative voltage capability
US9330776B2 (en) 2014-08-14 2016-05-03 Sandisk Technologies Inc. High voltage step down regulator with breakdown protection
WO2023056609A1 (zh) * 2021-10-08 2023-04-13 深圳市昊一源科技有限公司 接口转换装置、通话系统、回声对消方法和装置

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US3810182A (en) * 1971-08-12 1974-05-07 North American Rockwell Adaptive electronic hybrid transformer
GB1434239A (en) * 1972-08-10 1976-05-05 Siemens Ag Echo cancellers
US3949206A (en) * 1974-12-17 1976-04-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Filtering device
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US4032762A (en) * 1975-10-07 1977-06-28 Rockwell International Corporation Adjustable digital filter for high speed digital transmission

Also Published As

Publication number Publication date
ZA781059B (en) 1979-01-31
SE450680B (sv) 1987-07-13
FR2382815B1 (fr) 1986-12-12
YU41471B (en) 1987-08-31
AU3359678A (en) 1979-08-30
DE2808737A1 (de) 1978-09-07
DE2808737C2 (de) 1987-11-12
NO150380C (no) 1984-10-03
DK151434B (da) 1987-11-30
DD134904A5 (de) 1979-03-28
NO780629L (no) 1978-09-05
BE864425R (nl) 1978-09-01
JPS53134308A (en) 1978-11-22
PL205022A1 (pl) 1979-02-12
IT1115591B (it) 1986-02-03
IE780435L (en) 1978-09-02
GR64131B (en) 1980-01-26
NO150380B (no) 1984-06-25
GB1583635A (en) 1981-01-28
GB1583634A (en) 1981-01-28
IE46567B1 (en) 1983-07-27
YU49278A (en) 1982-06-30
CH639806A5 (de) 1983-11-30
PL125418B1 (en) 1983-05-31
NZ186579A (en) 1981-05-29
RO82015A (ro) 1984-09-29
HK46781A (en) 1981-09-25
IN149976B (ro) 1982-06-19
DK89378A (da) 1978-09-03
NL191006C (nl) 1994-12-01
AR232064A1 (es) 1985-04-30
SE8202318L (sv) 1982-04-13
NL191006B (nl) 1994-07-01
HU182505B (en) 1984-01-30
JPS6151840B2 (ro) 1986-11-11
IT7820545A0 (it) 1978-02-24
FI74180B (fi) 1987-08-31
AU512524B2 (en) 1980-10-16
BR7801291A (pt) 1978-12-12
EG13334A (en) 1981-06-30
SE439084B (sv) 1985-05-28
ATA127678A (de) 1983-11-15
CA1096522A (en) 1981-02-24
TR20458A (tr) 1981-07-23
FI74180C (fi) 1987-12-10
SU1191001A3 (ru) 1985-11-07
FR2382815A1 (fr) 1978-09-29
ES467422A1 (es) 1978-10-16
US4161633A (en) 1979-07-17
PT67724A (en) 1978-04-01
FI780695A7 (fi) 1978-09-03
MX145171A (es) 1982-01-12
SE7802271L (sv) 1978-09-03
NL7802234A (nl) 1978-09-05
AT375231B (de) 1984-07-10

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