EP0926850A1 - Selektiver Begrenzer - Google Patents

Selektiver Begrenzer Download PDF

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Publication number
EP0926850A1
EP0926850A1 EP98204271A EP98204271A EP0926850A1 EP 0926850 A1 EP0926850 A1 EP 0926850A1 EP 98204271 A EP98204271 A EP 98204271A EP 98204271 A EP98204271 A EP 98204271A EP 0926850 A1 EP0926850 A1 EP 0926850A1
Authority
EP
European Patent Office
Prior art keywords
branch
line
clipper
reception
arrangement
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.)
Withdrawn
Application number
EP98204271A
Other languages
English (en)
French (fr)
Inventor
Joel Gressent
Pascal Rouet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
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 Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of EP0926850A1 publication Critical patent/EP0926850A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/78—CATV [Community Antenna Television] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/28—Arrangements for simultaneous broadcast of plural pieces of information
    • H04H20/33—Arrangements for simultaneous broadcast of plural pieces of information by plural channels

Definitions

  • the present invention relates to a clipper for clipping a signal at a determined frequency, in a set including other signals including the amplitude is lower than that of the said signal and whose frequencies are different.
  • a cable television signal distribution network comprising an arrangement for processing telephone signals, for example example of a so-called GSM type, layout including among other things an antenna transmission-reception and a circuit separating a reception channel from a transmission channel, the layout including in the reception lane a clipper
  • An object of the invention is to provide a frequency selective, simple and efficient.
  • the clipper includes, inserted in a line carrying all of the signals, a circulator whose first branch is connected to the line on its side upstream, the second branch is connected to the line on its downstream side, and the third branch is connected to a reference terminal via the series arrangement of a filter band pass centered on said determined frequency, a threshold element, and a adapted load.
  • a cable television signal distribution network includes advantageously a clipper according to the invention, inserted in the reception channel, the first branch of the circulator is connected on the antenna side, the second branch is connected to a downstream part of the track.
  • Figure 1 is a partial diagram of a signal distribution network television provided with a circuit for transmitting and receiving telephone signals of the type says GSM.
  • Figure 2 is a diagram of a selective clipper according to the invention.
  • the cable television signal distribution network part of which is shown in Figure 1 includes a line 10 connected at 21 to a server center known television programs, not shown, and in 22 to a known distributor, not shown, serving users.
  • a line 10 On this line 10 are placed amplifiers 18, 19, 20; they are of a model for CATV, known per se, which amplifies in both directions, to allow interactivity, that is to say data feedback from users to the server.
  • This television network is set up to allow the transport of signals GSM type telephones.
  • GSM standard defines two frequency bands 8 MHz each, separate for transmission and reception. These two bands are both located just below 1 GHz.
  • the layout includes an antenna 8, then a filter 12 which lets through on a suitable coaxial line 6 the above frequency band for reception.
  • a GSM mobile When a GSM mobile requests a link, it transmits an amplitude signal maximum at a predetermined frequency and, after a link has been established, it most of the time uses a lower amplitude. In some cases, the signal maximum amplitude can saturate a reception system. It is therefore necessary to have a selective clipper.
  • a selective limiter S.L On line 6 are placed in cascade a selective limiter S.L, an amplifier 16, a downward frequency converter D.C which brings the GSM signals into a lower frequency band suitable for the television network, and finally a filter 14 which lets pass a frequency band corresponding to those of the filter 12, after conversion in the D.C. converter
  • the signals are finally introduced into line 10 by a coupler 23. They are taken up elsewhere by a coupler 24 and applied, via an I.A adaptation interface, known per se, to a B.T.S base, also known in itself, which formats them (demodulation, decoding, error correction) and delivers in analog form to the switched telephone network.
  • telephone signals are set up form (modulation, coding, addition of correcting codes) by the B.T.S database and are supplied to the television network, at a frequency compatible with the latter.
  • These signals intended to be transmitted by the antenna 8, are introduced on line 10 by the coupler 24 and taken off elsewhere by coupler 23 and filtered by a filter 15 which lets pass on a suitable coaxial line 7.
  • a filter 15 which lets pass on a suitable coaxial line 7.
  • U.C which brings the signals back into the GSM transmission frequency band
  • an amplifier 17 and finally a filter 13, connected on the air 8.
  • a GSM transmit-receive terminal uses a specific sub-band; this sub-band can for example comprise seven channels whose frequencies are spaced by 200 kHz.
  • a predetermined frequency F a is reserved for calls from mobiles to this terminal.
  • the television network must transmit together the seven channels of a sub-band (after conversion), including the frequency F a .
  • a mobile When picked up, a mobile transmits with a maximum amplitude, which is reduced as soon as the terminal detects the call and responds, in particular by indicating how much the amplitude must be reduced, which is a function of the quality of connection between the mobile and terminal.
  • the received signal can be very strong, and disturb the transmission of the other six channels by the television network. It is to avoid this that the selective clipper SL is provided.
  • the selective clipper in Figure 2 located on line 6, includes a circulator C inserted in the line.
  • the first branch 1 of this circulator is connected to the line 6, on the side of the antenna; the second branch 2 is connected to the downstream part of the line 6 going to the amplifier 16.
  • the third branch 3 is connected to a terminal reference (ground) via the series arrangement of a bandpass filter 9, a threshold element 4, and a load 5.
  • the reference terminal here is the mass, but it could also be for example a power source, provided that the necessary decoupling is provided.
  • the circulator can be a commercial model, fitted with coaxial connectors for connections of its three branches.
  • the bandpass filter 9 can be a model of the commerce, for example reactance, of sufficiently high degree.
  • Threshold element 4 here consists of two head-to-tail Schottky diodes; it could also be constituted any other known element becoming passing beyond a voltage threshold, and usable at a frequency of about one gigahertz.
  • Load 5 is a resistor whose the nominal value is equal to the characteristic impedance of line 6, minus the dynamic resistance presented by the threshold element when the threshold is exceeded; it could also, if necessary, be a more complex element, than the man of the profession knows how to determine, in order to charge the pump perfectly.
  • the operation is based on a particular property of a circulator: the latter normally transmits a signal from its first branch to its second branch when its third branch is charged with an impedance that is not adapted; on the contrary, it transmits the signal to the third branch when it is suitable.
  • the filter 9 When the frequency is F a , the filter 9 is on, and if the amplitude of the signal exceeds the conduction threshold of the diodes, the latter then have a low dynamic impedance: the third branch of the circulator is then connected to the adapted impedance constituted by the load 5, through the filter 9 and the diodes; the signal therefore passes from the first branch 1 to the third branch 3.
  • the filter 9 When the frequency is different from the frequency F a , the filter 9 is non-conducting and prevents the third branch of the circulator from being connected to the load 5; there is mismatching and the signal passes from the first branch 1 to the second branch 2.
  • the amplitude of the signal does not exceed the threshold of the diodes 4, the latter have a high impedance, which further prevents the third branch of the circulator to be connected to load 5; the signal passes from the first branch 1 to the second branch 2. In the end, only a signal at frequency F a of high amplitude is sent to the third branch.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Transceivers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Details Of Television Systems (AREA)
EP98204271A 1997-12-23 1998-12-16 Selektiver Begrenzer Withdrawn EP0926850A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716307A FR2773024A1 (fr) 1997-12-23 1997-12-23 Ecreteur selectif
FR9716307 1997-12-23

Publications (1)

Publication Number Publication Date
EP0926850A1 true EP0926850A1 (de) 1999-06-30

Family

ID=9514960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98204271A Withdrawn EP0926850A1 (de) 1997-12-23 1998-12-16 Selektiver Begrenzer

Country Status (4)

Country Link
US (1) US6374087B1 (de)
EP (1) EP0926850A1 (de)
JP (1) JPH11317640A (de)
FR (1) FR2773024A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104301910A (zh) * 2014-09-15 2015-01-21 河南普世通信科技有限公司 一种catv共缆多制式室分复用方法与系统

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL129031A (en) * 1999-03-17 2003-02-12 Handelman Doron Network control system for optical communication networks
US7167620B2 (en) * 2003-07-16 2007-01-23 Doron Handelman Devices and methods for all-optical processing and storage
KR100668653B1 (ko) * 2004-08-18 2007-01-12 한국전자통신연구원 시분할 이중화 방식의 무선 시스템에서의 송수신 신호분리 장치 및 그 방법
US7570844B2 (en) * 2005-01-18 2009-08-04 Doron Handelman Photonic integrated circuit device and elements thereof
JP2009284192A (ja) * 2008-05-22 2009-12-03 Fujitsu Ltd 利得温度補償回路
KR101083759B1 (ko) 2009-10-12 2011-11-18 주식회사 피플웍스 순시 피크 신호의 리미터 장치
US9294143B1 (en) * 2014-06-13 2016-03-22 L-3 Communications Corp. Circulator used as a high power TX/RX switch

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044357A (en) * 1975-12-04 1977-08-23 Westinghouse Electric Corporation FM/CW radar including a novel receiver protector of general utility
DE2811730A1 (de) * 1977-03-18 1978-09-21 Lignes Telegraph Telephon Hoechstfrequenz-leistungsbegrenzer
US4325140A (en) * 1978-10-06 1982-04-13 The United States Of America As Represented By The Scretary Of The Air Force Full duplex communication system apparatus using frequency selective limiters
FR2718890A1 (fr) * 1994-04-13 1995-10-20 Tekelec Airtronic Sa Agencement limiteur de puissance microonde.

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US4380822A (en) * 1981-11-02 1983-04-19 Motorola, Inc. Transmit-receive switching circuit for radio frequency circulators
US4641365A (en) 1984-08-23 1987-02-03 Rca Corporation Overpower protection for a radio frequency transceiver
US5129099A (en) * 1989-03-30 1992-07-07 Electromagnetic Sciences, Inc. Reciprocal hybrid mode rf circuit for coupling rf transceiver to an rf radiator
WO1992000634A1 (en) * 1990-06-22 1992-01-09 Motorola, Inc. Full duplex/half duplex power radio
EP0535590B1 (de) * 1991-09-30 1998-02-04 Nec Corporation Zweiwegzwischenverstärker mit optischer Verstärkung
GB9423027D0 (en) * 1994-11-15 1995-01-04 Univ Bristol Full-duplex radio transmitter/receiver
US5896563A (en) * 1995-04-27 1999-04-20 Murata Manufacturing Co., Ltd. Transmitting and receiving switch comprising a circulator and an automatic changeover switch which includes an impedance circuit
US5504609A (en) * 1995-05-11 1996-04-02 Ciena Corporation WDM optical communication system with remodulators
US5815803A (en) * 1996-03-08 1998-09-29 The United States Of America As Represented By The Secretary Of The Navy Wideband high isolation circulatior network
FR2749946B1 (fr) * 1996-06-14 1998-07-31 Alsthom Cge Alcatel Dispositif de mise en forme de signaux optiques binaires et son utilisation pour modifier lesdits signaux
US5923647A (en) * 1996-09-06 1999-07-13 Ericsson Inc. Circulator usage in time division duplex radios
KR19980065967A (ko) * 1997-01-17 1998-10-15 김광호 시스템 성능 개선을 위한 다중채널 시분할교신방식의 신호 송수신 장치
US6272327B1 (en) * 1998-06-18 2001-08-07 Lucent Technologies Inc. High power wireless telephone with over-voltage protection
KR100269177B1 (ko) * 1998-08-04 2000-10-16 윤종용 장파장 광섬유 증폭기
US6226275B1 (en) * 1999-08-25 2001-05-01 Utstarcom, Inc. Wide band high power ultralinear RF transreceiver

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044357A (en) * 1975-12-04 1977-08-23 Westinghouse Electric Corporation FM/CW radar including a novel receiver protector of general utility
DE2811730A1 (de) * 1977-03-18 1978-09-21 Lignes Telegraph Telephon Hoechstfrequenz-leistungsbegrenzer
US4325140A (en) * 1978-10-06 1982-04-13 The United States Of America As Represented By The Scretary Of The Air Force Full duplex communication system apparatus using frequency selective limiters
FR2718890A1 (fr) * 1994-04-13 1995-10-20 Tekelec Airtronic Sa Agencement limiteur de puissance microonde.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104301910A (zh) * 2014-09-15 2015-01-21 河南普世通信科技有限公司 一种catv共缆多制式室分复用方法与系统
CN104301910B (zh) * 2014-09-15 2019-08-09 河南普世通信科技有限公司 一种catv共缆多制式室分复用方法与系统

Also Published As

Publication number Publication date
JPH11317640A (ja) 1999-11-16
US6374087B1 (en) 2002-04-16
FR2773024A1 (fr) 1999-06-25

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