FR2385270A1 - Circuit d'equilibrage automatique de signaux transmis par un cable - Google Patents
Circuit d'equilibrage automatique de signaux transmis par un cableInfo
- Publication number
- FR2385270A1 FR2385270A1 FR7807995A FR7807995A FR2385270A1 FR 2385270 A1 FR2385270 A1 FR 2385270A1 FR 7807995 A FR7807995 A FR 7807995A FR 7807995 A FR7807995 A FR 7807995A FR 2385270 A1 FR2385270 A1 FR 2385270A1
- Authority
- FR
- France
- Prior art keywords
- signal
- cable
- signals
- balancing circuit
- signals transmitted
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/14—Control of transmission; Equalising characterised by the equalising network used
- H04B3/143—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers
- H04B3/145—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers variable equalisers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/10—Adaptations for transmission by electrical cable
- H04N7/102—Circuits therefor, e.g. noise reducers, equalisers, amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Picture Signal Circuits (AREA)
- Studio Circuits (AREA)
- Filters And Equalizers (AREA)
Abstract
L'invention concerne un circuit d'équilibrage de signaux sur un câble pour compenser automatiquement des signaux transmis par un câble qui subissent des pertes de réponse en amplitude et en fréquence pendant la transmission, et il comprend un moyen pour inclure un signal de référence ayant des composantes à basse et à haute frequence dans les signaux à transmettre, ainsi qu'un moyen d'addition. Selon l'invention, un moyen de traitement de signaux 26 produit un signal de correction; un moyen détecteur 30 produit un signal de contrôle; un moyen multiplicateur 24 réagit au signal de correction et au signal de contrôle pour restaurer l'amplitude du signal de sortie du moyen d'addition. L'invention s'applique notamment à la transmission de signaux d'appareils de prise de vue de télévision à distance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11903/77A GB1596774A (en) | 1977-03-21 | 1977-03-21 | Automatic cable equalizer circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2385270A1 true FR2385270A1 (fr) | 1978-10-20 |
FR2385270B1 FR2385270B1 (fr) | 1984-06-22 |
Family
ID=9994776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7807995A Granted FR2385270A1 (fr) | 1977-03-21 | 1978-03-20 | Circuit d'equilibrage automatique de signaux transmis par un cable |
Country Status (7)
Country | Link |
---|---|
US (1) | US4151490A (fr) |
JP (1) | JPS6056019B2 (fr) |
CA (1) | CA1083679A (fr) |
DE (1) | DE2812408C2 (fr) |
FR (1) | FR2385270A1 (fr) |
GB (1) | GB1596774A (fr) |
NL (1) | NL7803010A (fr) |
Families Citing this family (39)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5552645A (en) * | 1978-10-14 | 1980-04-17 | Nec Corp | Automatic equalizer |
US4393491A (en) * | 1980-11-05 | 1983-07-12 | Anaconda-Ericsson | Automatic self-test system for a digital multiplexed telecommunication system |
DE3148242A1 (de) * | 1981-12-05 | 1983-06-09 | Robert Bosch Gmbh, 7000 Stuttgart | Kabelentzerrerschaltung |
DE3248216A1 (de) * | 1982-12-27 | 1984-06-28 | Robert Bosch Gmbh, 7000 Stuttgart | Verfahren und schaltung zur automatischen einstellung der kabelentzerrung |
US4531165A (en) * | 1983-09-30 | 1985-07-23 | International Business Machines Corporation | Automatic amplitude equalizer based upon monitoring of channel power loss |
US4580176A (en) * | 1983-11-21 | 1986-04-01 | International Business Machines Corporation | Adaptive equalization circuit for magnetic recording channels utilizing signal timing |
US4724404A (en) * | 1985-11-01 | 1988-02-09 | Hughes Aircraft Company | Amplitude-weighting adaptive laser |
JPS62135118U (fr) * | 1986-02-19 | 1987-08-25 | ||
US5245291A (en) * | 1989-12-06 | 1993-09-14 | Hitachi Denshi Kabushiki Kaisha | Method and apparatus for detecting cable length |
US5159275A (en) * | 1989-12-06 | 1992-10-27 | Hitachi Denshi Kabushiki Kaisha | Method and apparatus for detecting cable length |
US5233418A (en) * | 1991-10-25 | 1993-08-03 | Tektronix, Inc. | Catv sweep system using a gated receiver |
FR2685832B1 (fr) * | 1991-12-31 | 1994-02-11 | Thomson Broadcast | Systeme correcteur de lignes de transmission. |
DE69327986T2 (de) * | 1992-06-03 | 2000-10-05 | Koninkl Philips Electronics Nv | System zur automatischen Kompensation der Kabeldämpfung |
FR2693609B1 (fr) * | 1992-07-07 | 1994-08-19 | Alcatel Reseaux Entreprise | Procédé de correction des pertes affectant un signal vidéo transmis par une liaison de type paire de fils et interface dotée d'un agencement de correction correspondant. |
DE69225709D1 (de) * | 1992-10-15 | 1998-07-02 | Ibm | Einrichtung und Verfahren zur adaptiven Entzerrung in Tokenringübertragungseinrichtungen unter Verwendung von ungeschirmten verdrillten Kabelpaaren |
US5887145A (en) * | 1993-09-01 | 1999-03-23 | Sandisk Corporation | Removable mother/daughter peripheral card |
US5506549A (en) * | 1994-11-14 | 1996-04-09 | Dsc Communications Corporation | Cable equalizer |
US5659581A (en) * | 1994-12-13 | 1997-08-19 | Paradyne Corporation | Modem receiver pre-emphasis |
JPH0918523A (ja) * | 1995-06-29 | 1997-01-17 | Fujitsu Ltd | 伝送装置における出力電圧自動調整方式 |
KR0157711B1 (ko) * | 1995-07-12 | 1998-11-16 | 김광호 | 데이타 통신단말장치에서 등화방법 |
US6466626B1 (en) | 1999-02-23 | 2002-10-15 | International Business Machines Corporation | Driver with in-situ variable compensation for cable attenuation |
US6940539B1 (en) * | 1999-04-30 | 2005-09-06 | General Electric Company | Variable cable length compensator for video imaging systems |
US6583684B1 (en) * | 2000-08-11 | 2003-06-24 | Broadband International, Inc. | Method of designing an equalizer and like electronic components |
US6927645B2 (en) * | 2000-08-11 | 2005-08-09 | Broadband International, Inc. | Electronic component structured to compensate for cable losses and method of production |
EP1237294B1 (fr) * | 2001-03-02 | 2008-10-15 | Cybex Computer Products Corporation | Verfahren und Vorrichtung zur Entzerrung der Kanaleigenschaften in einem Computerverlängerungssystem |
AU781568B2 (en) * | 2001-03-06 | 2005-06-02 | Avocent Huntsville Corporation | A method and apparatus for equalizing channel characteristics in a computer extension system |
JP4426222B2 (ja) * | 2003-07-10 | 2010-03-03 | 興和株式会社 | ケーブル延長装置 |
US7620101B1 (en) | 2003-09-24 | 2009-11-17 | Cypress Semiconductor Corporation | Equalizer circuit, communication system, and method that is adaptive to varying launch amplitudes for reducing receiver error |
US8031169B2 (en) * | 2003-12-17 | 2011-10-04 | Riip, Inc. | Automated system and method for high-frequency signal attenuation compensation |
US8341689B2 (en) * | 2005-09-07 | 2012-12-25 | Intersil Americas Inc. | Automatic frequency compensation of video signals transmitted across cables |
TWI392364B (zh) * | 2008-02-29 | 2013-04-01 | Analog Devices Inc | 用於影像補償之回饋系統及裝置 |
US8390740B2 (en) * | 2008-11-03 | 2013-03-05 | Intersil Americas Inc. | Systems and methods for cable equalization |
US8558955B2 (en) * | 2008-11-03 | 2013-10-15 | Intersil Americas Inc. | Cable equalization locking |
US8576966B2 (en) | 2010-02-01 | 2013-11-05 | Techwell, Inc. | Systems and methods for detecting tampering with video transmission systems |
US8767856B2 (en) | 2011-09-09 | 2014-07-01 | Intersil Americas LLC | Frame structure for a QAM system |
US8872978B2 (en) | 2011-06-09 | 2014-10-28 | Intersil Americas LLC | Cable equalization and monitoring for degradation and potential tampering |
JP5874519B2 (ja) * | 2012-05-02 | 2016-03-02 | ソニー株式会社 | 検出装置、給電装置、受電装置、給電システム及びプログラム |
JP6578731B2 (ja) * | 2015-04-30 | 2019-09-25 | 富士通株式会社 | 通信システム,制御装置および管理装置 |
CN105407253A (zh) * | 2015-11-03 | 2016-03-16 | 浙江大华技术股份有限公司 | 一种确定视频信号衰减数据的方法及装置 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2798900A (en) * | 1951-02-02 | 1957-07-09 | Philco Corp | Gain control system for color television receiver |
FR2168188A1 (fr) * | 1972-01-19 | 1973-08-31 | Cit Alcatel | |
US3772617A (en) * | 1972-11-02 | 1973-11-13 | Bell Telephone Labor Inc | Method and arrangement for setting the remanent flux density in magnetic circuits and equalizer utilizing same |
NL7609605A (nl) * | 1976-08-30 | 1978-03-02 | Philips Nv | Overdrachtsinrichting met een instelbaar net- werk. |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL166448B (nl) * | 1951-01-03 | Hartley Simon Ltd | Beluchter. | |
DE1259933B (de) * | 1962-06-20 | 1968-02-01 | Fernseh Gmbh | Schaltungsanordnung zur Entzerrung des Frequenzganges bei der UEbertragung von Videosignalen ueber ein Kabel |
US3336540A (en) * | 1965-04-15 | 1967-08-15 | Giannini Scient Corp | Two channel variable cable equalizer having passive amplitude equalization means in only one of the channels |
-
1977
- 1977-03-21 GB GB11903/77A patent/GB1596774A/en not_active Expired
- 1977-06-29 US US05/811,291 patent/US4151490A/en not_active Expired - Lifetime
-
1978
- 1978-03-13 CA CA298,746A patent/CA1083679A/fr not_active Expired
- 1978-03-17 JP JP53031624A patent/JPS6056019B2/ja not_active Expired
- 1978-03-20 FR FR7807995A patent/FR2385270A1/fr active Granted
- 1978-03-20 NL NL7803010A patent/NL7803010A/xx not_active Application Discontinuation
- 1978-03-21 DE DE2812408A patent/DE2812408C2/de not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2798900A (en) * | 1951-02-02 | 1957-07-09 | Philco Corp | Gain control system for color television receiver |
FR2168188A1 (fr) * | 1972-01-19 | 1973-08-31 | Cit Alcatel | |
US3772617A (en) * | 1972-11-02 | 1973-11-13 | Bell Telephone Labor Inc | Method and arrangement for setting the remanent flux density in magnetic circuits and equalizer utilizing same |
NL7609605A (nl) * | 1976-08-30 | 1978-03-02 | Philips Nv | Overdrachtsinrichting met een instelbaar net- werk. |
FR2363241A1 (fr) * | 1976-08-30 | 1978-03-24 | Philips Nv | Dispositif de transmission muni d'un circuit ajustable |
Also Published As
Publication number | Publication date |
---|---|
GB1596774A (en) | 1981-08-26 |
FR2385270B1 (fr) | 1984-06-22 |
JPS53116719A (en) | 1978-10-12 |
CA1083679A (fr) | 1980-08-12 |
DE2812408C2 (de) | 1985-08-08 |
DE2812408A1 (de) | 1978-09-28 |
US4151490A (en) | 1979-04-24 |
NL7803010A (nl) | 1978-09-25 |
JPS6056019B2 (ja) | 1985-12-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |