ES2014083A6 - Frequency generators - Google Patents

Frequency generators

Info

Publication number
ES2014083A6
ES2014083A6 ES8901561A ES8901561A ES2014083A6 ES 2014083 A6 ES2014083 A6 ES 2014083A6 ES 8901561 A ES8901561 A ES 8901561A ES 8901561 A ES8901561 A ES 8901561A ES 2014083 A6 ES2014083 A6 ES 2014083A6
Authority
ES
Spain
Prior art keywords
signal
oscillator
phase locked
locked loop
derived
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.)
Expired - Fee Related
Application number
ES8901561A
Other languages
Spanish (es)
Inventor
Jean-Alain Chabas
Joel Remy
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.)
MARCONI ADRET
Original Assignee
MARCONI ADRET
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 MARCONI ADRET filed Critical MARCONI ADRET
Publication of ES2014083A6 publication Critical patent/ES2014083A6/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/08—Details of the phase-locked loop
    • H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside the loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
    • H03L7/00—Automatic control of frequency or phase; Synchronisation
    • H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/22—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop
    • H03L7/23—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using more than one loop with pulse counters or frequency dividers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/38—Transmitter circuitry for the transmission of television signals according to analogue transmission standards

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Radio Relay Systems (AREA)

Abstract

A high precision reference frequency usable for synthesizing the local oscillator frequencies of a transmission or re-transmission station especially in a TV grid network is derived from the received signal which may be heavily attenuated and modulated by a video signal and by the synchronization signals by first converting the received signal into an IF signal and eliminating the video signal in a fixed narrow band filter 22 and then the modulation and synchronization components in a first phase locked loop 24 to produce a signal which after frequency division at 25 is used to control via a second phase locked loop a pilot oscillator 18 producing the required output. The generator is adapted to handle signals corresponding to the French or the European-American standards by suitable frequency conversion twice at 9,21. Local oscillators 12, 12a are incorporated in PLLs responsive to an output of oscillator 18. The second phase locked loop is maintained in lock by a signal on line 240 even when input signal Fi fails. The input signal to first loop 24 may be derived instead from a stable reference oscillator via elements 31-33.
ES8901561A 1988-05-05 1989-05-05 Frequency generators Expired - Fee Related ES2014083A6 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8806027A FR2631180B1 (en) 1988-05-05 1988-05-05 BI-STANDARD FREQUENCY TRANSPOSITION GENERATOR, PARTICULARLY FOR TELEVISION MESH NETWORK

Publications (1)

Publication Number Publication Date
ES2014083A6 true ES2014083A6 (en) 1990-06-16

Family

ID=9366009

Family Applications (1)

Application Number Title Priority Date Filing Date
ES8901561A Expired - Fee Related ES2014083A6 (en) 1988-05-05 1989-05-05 Frequency generators

Country Status (7)

Country Link
DE (1) DE3914693A1 (en)
ES (1) ES2014083A6 (en)
FR (1) FR2631180B1 (en)
GB (1) GB2219157B (en)
IT (1) IT1233805B (en)
NO (1) NO891623L (en)
SE (1) SE8901293L (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2698221B1 (en) * 1992-11-17 1995-07-21 Erfatec PILOT OSCILLATOR FOR TV TRANSMITTER AND TRANSMITTER.
GB9505522D0 (en) * 1995-03-18 1995-05-03 Gen Electric Co Plc Commodity consumption registering meters
US6549242B1 (en) * 1997-04-04 2003-04-15 Harris Corporation Combining adjacent TV channels for transmission by a common antenna
CN104348537B (en) * 2014-10-29 2017-09-26 成都锐新科技有限公司 A kind of fast-forwarding system based on microwave equipment

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571621A (en) * 1983-06-15 1986-02-18 Microband Corporation Of America Television transmitter
NL8500675A (en) * 1985-03-11 1986-10-01 Philips Nv AM RECEIVER.
US4817197A (en) * 1986-07-18 1989-03-28 Nippon Telegraph And Telephone Corporation Mobile communication apparatus

Also Published As

Publication number Publication date
SE8901293L (en) 1989-11-06
FR2631180B1 (en) 1991-03-29
DE3914693A1 (en) 1989-11-16
IT8983388A0 (en) 1989-04-26
SE8901293D0 (en) 1989-04-11
DE3914693C2 (en) 1992-10-29
GB8910024D0 (en) 1989-06-21
GB2219157B (en) 1992-09-30
NO891623L (en) 1989-11-06
GB2219157A (en) 1989-11-29
IT1233805B (en) 1992-04-17
FR2631180A1 (en) 1989-11-10
NO891623D0 (en) 1989-04-20

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 20000201