GB1114118A - Automatic frequency control systems - Google Patents

Automatic frequency control systems

Info

Publication number
GB1114118A
GB1114118A GB2867965A GB2867965A GB1114118A GB 1114118 A GB1114118 A GB 1114118A GB 2867965 A GB2867965 A GB 2867965A GB 2867965 A GB2867965 A GB 2867965A GB 1114118 A GB1114118 A GB 1114118A
Authority
GB
United Kingdom
Prior art keywords
oscillator
automatic frequency
frequency control
control systems
divider
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
GB2867965A
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.)
CAMPAGNIE FRANCAISE THOMSON HO
Compagnie Francaise Thomson Houston SA
Original Assignee
CAMPAGNIE FRANCAISE THOMSON HO
Compagnie Francaise Thomson Houston SA
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 CAMPAGNIE FRANCAISE THOMSON HO, Compagnie Francaise Thomson Houston SA filed Critical CAMPAGNIE FRANCAISE THOMSON HO
Publication of GB1114118A publication Critical patent/GB1114118A/en
Expired 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
    • H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
    • H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
    • H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K23/00—Pulse counters comprising counting chains; Frequency dividers comprising counting chains
    • H03K23/64—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two
    • H03K23/66—Pulse counters comprising counting chains; Frequency dividers comprising counting chains with a base or radix other than a power of two with a variable counting base, e.g. by presetting or by adding or suppressing pulses

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Selective Calling Equipment (AREA)

Abstract

1,114,118. Automatic frequency control systems. COMPAGNIE FRANCAISE THOMSON - HOUSTON - HOTCHKISS BRANDT. 6 July, 1965 [8 July, 1964], No. 28679/65. Heading H3A. [Also in Division G4] An automatic frequency control system wherein an oscillator 11, Fig. 1, feeds a divider 12 to provide an input to discriminator 13 at the same frequency as a reference oscillator 15, is characterized in that the division ratio of divider 12 is set by electronic switches which may be controlled by a digital input signal. This input signal may be fed via a series-parallel converter (25, Fig. 2, not shown) to control three triggers (241-243) which in turn control three electronic changeover switches (221-223) controlling a three-stage binary counter (211- 213) and a re-setting AND gate (23). The A.F.C. loop may include a search oscillator 17 acting on the variable reactance 14 controlling the frequency of oscillator 11.
GB2867965A 1964-07-08 1965-07-06 Automatic frequency control systems Expired GB1114118A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR981056A FR1411080A (en) 1964-07-08 1964-07-08 Improvements to electronic frequency control devices

Publications (1)

Publication Number Publication Date
GB1114118A true GB1114118A (en) 1968-05-15

Family

ID=8834141

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2867965A Expired GB1114118A (en) 1964-07-08 1965-07-06 Automatic frequency control systems

Country Status (6)

Country Link
BE (1) BE665802A (en)
DE (1) DE1466039A1 (en)
ES (1) ES315032A1 (en)
FR (1) FR1411080A (en)
GB (1) GB1114118A (en)
NL (1) NL6508715A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146500A (en) * 1983-08-30 1985-04-17 Tokico Ltd Digital to analog convertor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2146500A (en) * 1983-08-30 1985-04-17 Tokico Ltd Digital to analog convertor

Also Published As

Publication number Publication date
BE665802A (en) 1965-12-23
DE1466039A1 (en) 1969-11-27
FR1411080A (en) 1965-09-17
ES315032A1 (en) 1966-01-01
NL6508715A (en) 1966-01-10

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