GB1430142A - Automatic frequency control loop apparatus - Google Patents

Automatic frequency control loop apparatus

Info

Publication number
GB1430142A
GB1430142A GB1498773A GB1498773A GB1430142A GB 1430142 A GB1430142 A GB 1430142A GB 1498773 A GB1498773 A GB 1498773A GB 1498773 A GB1498773 A GB 1498773A GB 1430142 A GB1430142 A GB 1430142A
Authority
GB
United Kingdom
Prior art keywords
discriminator
frequency
output
control loop
reference frequency
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
Application number
GB1498773A
Other languages
English (en)
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.)
BBC BROWN BOVERI and CIE
BBC Brown Boveri AG Switzerland
Original Assignee
BBC BROWN BOVERI and CIE
BBC Brown Boveri AG Switzerland
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 BBC BROWN BOVERI and CIE, BBC Brown Boveri AG Switzerland filed Critical BBC BROWN BOVERI and CIE
Publication of GB1430142A publication Critical patent/GB1430142A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/06—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators
    • H03D3/08—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by combining signals additively or in product demodulators by means of diodes, e.g. Foster-Seeley discriminator
    • 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
    • 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
    • H03L7/02—Automatic control of frequency or phase; Synchronisation using a frequency discriminator comprising a passive frequency-determining element
    • 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
    • H03L7/14—Details of the phase-locked loop for assuring constant frequency when supply or correction voltages fail

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
GB1498773A 1972-03-30 1973-03-28 Automatic frequency control loop apparatus Expired GB1430142A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH466372A CH543193A (de) 1972-03-30 1972-03-30 Frequenzdetektor

Publications (1)

Publication Number Publication Date
GB1430142A true GB1430142A (en) 1976-03-31

Family

ID=4280291

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1498773A Expired GB1430142A (en) 1972-03-30 1973-03-28 Automatic frequency control loop apparatus

Country Status (7)

Country Link
US (1) US3873923A (enExample)
AT (1) AT326217B (enExample)
CH (1) CH543193A (enExample)
DE (1) DE2222903A1 (enExample)
FR (1) FR2178090B3 (enExample)
GB (1) GB1430142A (enExample)
NL (1) NL7304294A (enExample)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1421093A (en) * 1974-05-09 1976-01-14 Mullard Ltd Frequency discriminator circuit arrangement
GB1509913A (en) * 1974-05-21 1978-05-04 Racal Instruments Ltd Electrical circuit arrangements for converting an input signal of variable frequency to a signal of predetermined mean frequency
JPS51142201A (en) * 1975-06-02 1976-12-07 Onkyo Corp Automatic frequency control circuit
US4119926A (en) * 1977-12-08 1978-10-10 Nasa Apparatus and method for stabilized phase detection for binary signal tracking loops
FR2472302A1 (fr) * 1979-12-21 1981-06-26 Thomson Csf Circuit a asservissement de phase, et dispositif comportant un tel circuit notamment pour la television
NL8801143A (nl) * 1988-05-02 1989-12-01 Philips Nv Frequentiedemodulatieschakeling.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686574A (en) * 1970-08-19 1972-08-22 Hallicrafters Co Self-correcting afc system

Also Published As

Publication number Publication date
FR2178090B3 (enExample) 1976-03-26
AT326217B (de) 1975-11-25
DE2222903A1 (de) 1973-10-11
US3873923A (en) 1975-03-25
NL7304294A (enExample) 1973-10-02
ATA43573A (de) 1975-02-15
FR2178090A1 (enExample) 1973-11-09
CH543193A (de) 1973-10-15

Similar Documents

Publication Publication Date Title
GB1245504A (en) Improved phase lock loop
US2708746A (en) Approach signal system with selfadjusting control
GB1480544A (en) Band pass filter circuit
GB911611A (en) Radio diversity receiving system
GB1430142A (en) Automatic frequency control loop apparatus
GB1186907A (en) Improvements in or relating to Colour Television Receivers
GB1382960A (en) Vor receiver with adaptive filters and phase shifter for improved accuracy
GB609813A (en) Improvements in and relating to automatic frequency control of electrical oscillating systems and apparatus
GB1421370A (en) Band pass filter circuitry
GB1503544A (en) Defect compensation systems
GB1190459A (en) A Circuit Arrangement for Automatically Tuning a Communication Apparatus.
GB1104956A (en) Fm demodulator system
US3588752A (en) Tracking filter
US4118673A (en) Phase lock loop controlled offset local oscillator system
GB1009498A (en) Analogue multiplier
US2453988A (en) Automatic frequency control
US2609654A (en) Method of and system for obtaining a standard low frequency
US2669659A (en) Stabilized generator
GB1110153A (en) Improved angle-modulation signal system of the angle-lock type
GB1512292A (en) Apparatus and method for setting the tuning of a resonant circuit
JPS5673369A (en) Phase comparison system of decca receiving device
FR2250226A1 (en) Logic signal controlled frequency modulator - signals are applied to variable oscillator through digital analogue converter
GB1232507A (enExample)
SU445112A1 (ru) Устройство импульсной автоподстройки частоты
SU1684929A1 (ru) Устройство фазовой автоподстройки частоты

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee