HK1000437A1 - Automatic frequency control system - Google Patents

Automatic frequency control system

Info

Publication number
HK1000437A1
HK1000437A1 HK97102005A HK97102005A HK1000437A1 HK 1000437 A1 HK1000437 A1 HK 1000437A1 HK 97102005 A HK97102005 A HK 97102005A HK 97102005 A HK97102005 A HK 97102005A HK 1000437 A1 HK1000437 A1 HK 1000437A1
Authority
HK
Hong Kong
Prior art keywords
control system
frequency control
automatic frequency
automatic
frequency
Prior art date
Application number
HK97102005A
Other languages
English (en)
Inventor
Mcginn Michael
Original Assignee
Motorola Inc
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
Priority claimed from US07/080,934 external-priority patent/US4766391A/en
Priority claimed from US07/081,041 external-priority patent/US4796102A/en
Priority claimed from US07/081,085 external-priority patent/US4745370A/en
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of HK1000437A1 publication Critical patent/HK1000437A1/xx

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
    • H03F1/083—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements in transistor amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/16—Networks for phase shifting
    • H03H11/20—Two-port phase shifters providing an adjustable phase shift
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/06—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers
    • H03J7/065—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using counters or frequency dividers the counter or frequency divider being used in a phase locked 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
    • H03L7/08—Details of the phase-locked loop
    • H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
    • H03L7/12—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range using a scanning signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/455—Demodulation-circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Television Receiver Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Superheterodyne Receivers (AREA)
HK97102005A 1987-08-03 1997-10-22 Automatic frequency control system HK1000437A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/080,934 US4766391A (en) 1987-08-03 1987-08-03 Video demodulator system
US07/081,041 US4796102A (en) 1987-08-03 1987-08-03 Automatic frequency control system
US07/081,085 US4745370A (en) 1987-08-03 1987-08-03 Adjustable phase shift circuit

Publications (1)

Publication Number Publication Date
HK1000437A1 true HK1000437A1 (en) 1998-03-20

Family

ID=27373805

Family Applications (1)

Application Number Title Priority Date Filing Date
HK97102005A HK1000437A1 (en) 1987-08-03 1997-10-22 Automatic frequency control system

Country Status (5)

Country Link
EP (1) EP0302290B1 (de)
JP (1) JP2911458B2 (de)
KR (1) KR960016784B1 (de)
DE (1) DE3852441T2 (de)
HK (1) HK1000437A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01196946A (ja) * 1988-02-01 1989-08-08 Toshiba Corp 周波数制御装置
US4814887A (en) * 1988-05-23 1989-03-21 General Instrument Corporation Automatic frequency control
DE4332161A1 (de) * 1993-09-22 1995-03-23 Thomson Brandt Gmbh Hochfrequenzempfänger
EP0660512B1 (de) * 1993-12-22 1999-12-08 Philips Composants Et Semiconducteurs Phasenschiebverstärker und seine Verwendung in einer Zusammenführungsschaltung
JP4716302B2 (ja) * 2001-04-21 2011-07-06 九州日立マクセル株式会社 発光表示装置を備えた小型電気機器
JP2007232790A (ja) * 2006-02-27 2007-09-13 Inaba Denki:Kk 照明式表示装置
JP2008139511A (ja) * 2006-11-30 2008-06-19 Inaba Denki:Kk 照明式表示装置用表示板とそれを用いた照明式表示装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1073074B (it) * 1975-11-14 1985-04-13 Rca Corp Sintetizzatore di frequenze televisive,per portanti di frequenza non standardizzata
US4291413A (en) * 1979-09-28 1981-09-22 Rca Corporation Search type tuning system with direct address channel selection apparatus
US4358791A (en) * 1980-12-01 1982-11-09 Rca Corporation Phase locked loop tuning control system including a sync activated AFT signal seeking arrangement
US4575761A (en) * 1983-04-28 1986-03-11 Rca Corporation AFT arrangement for a double conversion tuner

Also Published As

Publication number Publication date
KR890004494A (ko) 1989-04-22
DE3852441T2 (de) 1995-06-29
EP0302290A3 (en) 1989-12-27
KR960016784B1 (ko) 1996-12-20
EP0302290B1 (de) 1994-12-14
JP2911458B2 (ja) 1999-06-23
EP0302290A2 (de) 1989-02-08
DE3852441D1 (de) 1995-01-26
JPS6455977A (en) 1989-03-02

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)