GB1175311A – Improvements in or relating to Frequency Synchronism Detecting Circuits.
– Google Patents
GB1175311A – Improvements in or relating to Frequency Synchronism Detecting Circuits.
– Google Patents
Improvements in or relating to Frequency Synchronism Detecting Circuits.
Info
Publication number
GB1175311A
GB1175311A
GB075/68A
GB17568A
GB1175311A
GB 1175311 A
GB1175311 A
GB 1175311A
GB 075/68 A
GB075/68 A
GB 075/68A
GB 17568 A
GB17568 A
GB 17568A
GB 1175311 A
GB1175311 A
GB 1175311A
Authority
GB
United Kingdom
Prior art keywords
output
input
stable
circuit
gate
Prior art date
1966-12-30
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
GB075/68A
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.)
Alcatel CIT SA
Original Assignee
Alcatel CIT SA
Compagnie Industrielle de Telecommunication CIT Alcatel 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.)
1966-12-30
Filing date
1968-01-01
Publication date
1969-12-23
1968-01-01
Application filed by Alcatel CIT SA, Compagnie Industrielle de Telecommunication CIT Alcatel SA
filed
Critical
Alcatel CIT SA
1969-12-23
Publication of GB1175311A
publication
Critical
patent/GB1175311A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
H03L7/187—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 using means for coarse tuning the voltage controlled oscillator of 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
H03L7/20—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it
Abstract
1,175,311. Frequency discriminators. C. I. T. COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 1 Jan., 1968 [30 Dec., 1966], No. 175/68. Heading H3A. A circuit for producing different outputs according to whether oscillators 11 and 14 operate at the same frequency or not, comprises squaring circuits 12 and 15 which derive square waves from their respective inputs, a differentiating circuit 16 which produces a short pulse once in each cycle of oscillator 14, two input bistable circuits 13 and 17 supplied with the pulses and with the direct and inverted outputs of the squaring circuit 12, and two output bi-stable circuits 25 which energize an AND gate 18 only when the input frequencies differ. If the input frequencies are the same, one of the input bi-stables will produce a constant zero output (Fig. 2d or 2g, not shown) whilst the other produces a square wave at half the input frequency (Fig. 2e or 2f, not shown). If the frequencies differ there will occasionally be a ONE output from both bi-stables and this causes an output from AND gate 18 operating a relay 27 which may actuate an indicator or a frequency sweep circuit 28. A zero output from bi-stable 13 produces a ONE output from inverter 19a, which output is maintained by an integrating circuit 20a and inverted by unit 24a to provide a zero input to terminal S of output bi-stable 25a. This provides a zero output QIII which closes gate 18, and a ONE output QIII which opens gate 26a to allow any subsequent ONE from bi-stable 13 to change the state of the bi-stable 25a. On the occurrence of such a ONE signal the integrating circuit 20a is rapidly discharged through diode 21a.
GB075/68A
1966-12-30
1968-01-01
Improvements in or relating to Frequency Synchronism Detecting Circuits.
Expired
GB1175311A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
FR89590A
FR1525939A
(en)
1966-12-30
1966-12-30
Circuit used to detect synchronism between two frequencies
Publications (1)
Publication Number
Publication Date
GB1175311A
true
GB1175311A
(en)
1969-12-23
Family
ID=8623238
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB075/68A
Expired
GB1175311A
(en)
1966-12-30
1968-01-01
Improvements in or relating to Frequency Synchronism Detecting Circuits.
Country Status (7)
Country
Link
US
(1)
US3515997A
(en)
BE
(1)
BE708657A
(en)
DE
(1)
DE1591872A1
(en)
FR
(1)
FR1525939A
(en)
GB
(1)
GB1175311A
(en)
LU
(1)
LU55191A1
(en)
NL
(1)
NL6717787A
(en)
Families Citing this family (20)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
GB1279611A
(en)
*
1968-07-01
1972-06-28
George William Gurry
Improvements in circuit arrangements
US3573637A
(en)
*
1969-07-22
1971-04-06
Stromberg Datagraphix Inc
Timing system with output representing predetermined and constant phase displacement from variable requency input
US3611147A
(en)
*
1969-11-24
1971-10-05
Us Army
Phase-modulated binary data transmission system employing a variable frequency oscillator
US3646360A
(en)
*
1970-06-18
1972-02-29
Allen Bradley Co
Data interpretation network
FR2106876A5
(en)
*
1970-09-25
1972-05-05
Inst Francais Du Petrole
GB1364637A
(en)
*
1970-12-15
1974-08-21
Aisin Seiki
Method of and apparatus for indicating the lower and higher
US3736516A
(en)
*
1971-06-14
1973-05-29
Lorain Prod Corp
Variable frequency pulse generating circuit
US3723888A
(en)
*
1971-06-14
1973-03-27
Lorain Prod Corp
Phase responsive control circuit
US3755745A
(en)
*
1971-08-20
1973-08-28
Itt
Noise discrimination apparatus
IT981086B
(en)
*
1972-03-04
1974-10-10
Sony Corp
DISCRIMINATING SIGNAL CIRCUIT
US3755746A
(en)
*
1972-03-07
1973-08-28
Collins Radio Co
Frequency comparison indicating apparatus
FR2205775B1
(en)
*
1972-11-06
1980-04-30
Cit Alcatel
US3798555A
(en)
*
1972-11-16
1974-03-19
Motorola Inc
Pulse recovery system
US3829786A
(en)
*
1973-02-20
1974-08-13
Gen Electric
Dynamic constraint of a control signal
US3795867A
(en)
*
1973-04-02
1974-03-05
Gte Automatic Electric Lab Inc
Pulse detection arrangement
US3936758A
(en)
*
1973-12-03
1976-02-03
Exxon Production Research Company
Phase difference detector
SE382120B
(en)
*
1975-01-29
1976-01-12
Ericsson Telefon Ab L M
DEVICE FOR SATURATION OF SMALL FREQUENCY DIFFERENCES
US4245192A
(en)
*
1978-10-19
1981-01-13
Lockheed Corporation
Periodicity verification circuit
DE3486061T2
(en)
*
1983-11-17
1993-05-19
Toshiba Kawasaki Kk
OSCILLATOR CIRCUIT.
US5103162A
(en)
*
1991-03-21
1992-04-07
Westinghouse Electric Corp.
Apparatus for determining when a preselected phase relationship exists between two periodic waveforms
Family Cites Families (4)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US2933682A
(en)
*
1956-03-05
1960-04-19
Gen Dynamics Corp
Frequency measuring apparatus
US3012200A
(en)
*
1957-10-18
1961-12-05
Hurvitz Hyman
Frequency coincidence detector
US3205438A
(en)
*
1962-01-22
1965-09-07
Electro Mechanical Res Inc
Phase detector employing bistable circuits
DE1283270B
(en)
*
1966-06-03
1968-11-21
Standard Elektrik Lorenz Ag
Method for the electronic adjustment of the actual frequency of a tone or high frequency generator to a target frequency
1966
1966-12-30
FR
FR89590A
patent/FR1525939A/en
not_active
Expired
1967
1967-12-28
BE
BE708657D
patent/BE708657A/xx
unknown
1967-12-29
NL
NL6717787A
patent/NL6717787A/xx
unknown
1967-12-29
LU
LU55191D
patent/LU55191A1/xx
unknown
1967-12-29
DE
DE19671591872
patent/DE1591872A1/en
active
Pending
1968
1968-01-01
GB
GB075/68A
patent/GB1175311A/en
not_active
Expired
1968-01-02
US
US695038A
patent/US3515997A/en
not_active
Expired – Lifetime
Also Published As
Publication number
Publication date
BE708657A
(en)
1968-06-28
US3515997A
(en)
1970-06-02
FR1525939A
(en)
1968-05-24
LU55191A1
(en)
1969-08-08
NL6717787A
(en)
1968-07-01
DE1591872A1
(en)
1970-10-01
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Legal Events
Date
Code
Title
Description
1970-05-06
PS
Patent sealed [section 19, patents act 1949]
1972-07-26
PLNP
Patent lapsed through nonpayment of renewal fees
