[go: up one dir, main page]

SE8901293D0 - DUAL STANDARD FREQUENCY TRANSLATION GENERATOR, IN PARTICULAR FOR TELEVISION GRID NETWORKS - Google Patents

DUAL STANDARD FREQUENCY TRANSLATION GENERATOR, IN PARTICULAR FOR TELEVISION GRID NETWORKS

Info

Publication number
SE8901293D0
SE8901293D0 SE8901293A SE8901293A SE8901293D0 SE 8901293 D0 SE8901293 D0 SE 8901293D0 SE 8901293 A SE8901293 A SE 8901293A SE 8901293 A SE8901293 A SE 8901293A SE 8901293 D0 SE8901293 D0 SE 8901293D0
Authority
SE
Sweden
Prior art keywords
signal
oscillator
phase locked
locked loop
frequency translation
Prior art date
Application number
SE8901293A
Other languages
Swedish (sv)
Other versions
SE8901293L (en
Inventor
J-A Chabas
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 SE8901293D0 publication Critical patent/SE8901293D0/en
Publication of SE8901293L publication Critical patent/SE8901293L/en

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. <IMAGE>
SE8901293A 1988-05-05 1989-04-11 TRANSLATION GENERATOR FOR DOUBLE STANDARD FREQUENCY, SPECIFICALLY FOR THE TELEVISION NETWORK SE8901293L (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 (2)

Publication Number Publication Date
SE8901293D0 true SE8901293D0 (en) 1989-04-11
SE8901293L SE8901293L (en) 1989-11-06

Family

ID=9366009

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8901293A SE8901293L (en) 1988-05-05 1989-04-11 TRANSLATION GENERATOR FOR DOUBLE STANDARD FREQUENCY, SPECIFICALLY FOR THE TELEVISION NETWORK

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
GB2219157B (en) 1992-09-30
NO891623D0 (en) 1989-04-20
NO891623L (en) 1989-11-06
GB8910024D0 (en) 1989-06-21
ES2014083A6 (en) 1990-06-16
FR2631180B1 (en) 1991-03-29
DE3914693A1 (en) 1989-11-16
IT1233805B (en) 1992-04-17
DE3914693C2 (en) 1992-10-29
IT8983388A0 (en) 1989-04-26
SE8901293L (en) 1989-11-06
GB2219157A (en) 1989-11-29
FR2631180A1 (en) 1989-11-10

Similar Documents

Publication Publication Date Title
CA2063837A1 (en) Clock generation circuit for multistandard serial digital video with automatic format identification
KR840008729A (en) Automatic fine tuner for dual conversion tuner
EP0717491A3 (en) High precision, low phase noise synthesizer with vector modulator
EP0691746A4 (en)
MY115022A (en) Tuner for digital satellite receiver
US4618996A (en) Dual pilot phase lock loop for radio frequency transmission
SE7701809L (en) DOUBLE MOD FREQUENCY SYNTHESIS DEVICE FOR A TELEVISION VOTE DEVICE
EP0246658A3 (en) Transmitter/receiver apparatus
US4912773A (en) Communications system utilizing a pilot signal and a modulated signal
JPS54139316A (en) Am ssb transmitter/receiver
PL168665B1 (en) Apparatus for generating clocking signals for digital conversion circuitry in television receivers
JPS57125528A (en) Frequency synthesizer
SE8901293D0 (en) DUAL STANDARD FREQUENCY TRANSLATION GENERATOR, IN PARTICULAR FOR TELEVISION GRID NETWORKS
GB1407575A (en) Cable television converter
DE3477631D1 (en) Stabilized color television subcarrier regenerator circuit and method
US2999154A (en) Single sideband reception
US4318120A (en) Color TV buried subcarrier system
SE8704385L (en) A CONVERSION CONTROLLING CONNECTOR FOR A PHONE SYNTHETIC DETAILED FOR A PHONE SYSTEM
JPS54150016A (en) Channel selector
JPS6128449Y2 (en)
JPS57132444A (en) Carrier frequency controlling system for slave station applied to multidirection multiplex communication system
JPS57193188A (en) Television channel selecting device
JPH036070Y2 (en)
JPS5620355A (en) Clock signal forming circuit
JPS5585152A (en) Spare unit for radio line

Legal Events

Date Code Title Description
NAV Patent application has lapsed

Ref document number: 8901293-4

Effective date: 19931101