GB1421370A – Band pass filter circuitry
– Google Patents
GB1421370A – Band pass filter circuitry
– Google Patents
Band pass filter circuitry
Info
Publication number
GB1421370A
GB1421370A
GB2824273A
GB2824273A
GB1421370A
GB 1421370 A
GB1421370 A
GB 1421370A
GB 2824273 A
GB2824273 A
GB 2824273A
GB 2824273 A
GB2824273 A
GB 2824273A
GB 1421370 A
GB1421370 A
GB 1421370A
Authority
GB
United Kingdom
Prior art keywords
input
phase
output
filter
circuit
Prior art date
1972-06-14
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
GB2824273A
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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.)
1972-06-14
Filing date
1973-06-13
Publication date
1976-01-14
1973-06-13
Application filed by Fujitsu Ltd
filed
Critical
Fujitsu Ltd
1976-01-14
Publication of GB1421370A
publication
Critical
patent/GB1421370A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
H03H19/00—Networks using time-varying elements, e.g. N-path filters
Abstract
1421370 Automatic phase control in active filters FUJITSU Ltd 13 June 1973 [14 June 1972] 28242/73 Headings H3A and H3U A bandpass filter comprises: a first frequency changer FCV1 having a first input A to which an input signal may be applied; a second frequency changer FCV2 having an output F from which a filtered signal may be derived; a bandpass filter BPF connected between the output of the first frequency changer and a first input of the second; a phase detector PD connected to produce a control signal dependent on the phase difference between the input and output signals of filter BPF; a voltage controlled oscillator VCO controlled by the control signal so as to supply second input signals to the two frequency changers; and a phase shifter DL interposed between the voltage controlled oscillator and one of the second inputs. The phase shifter may produce a phase shift such that the output at F is in phase with the input at A or, if the output includes a circuit CB introducing delay, such that the output at I is in phase with the input. The circuit DL may be a delay line, a helical filter or an LC circuit. Figs. 3a, 3b (not shown) give details of the various circuits. The two frequency changers are diode bridge type, with transistor input and output stages, as is the phase detector. The band pass filter may be a helical filter, and the oscillator may be a transistorized Hartley oscillator tuned by a variable capacity diode.
GB2824273A
1972-06-14
1973-06-13
Band pass filter circuitry
Expired
GB1421370A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP5915372A
JPS5641010B2
(en)
1972-06-14
1972-06-14
Publications (1)
Publication Number
Publication Date
GB1421370A
true
GB1421370A
(en)
1976-01-14
Family
ID=13105107
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2824273A
Expired
GB1421370A
(en)
1972-06-14
1973-06-13
Band pass filter circuitry
Country Status (6)
Country
Link
US
(1)
US3805173A
(en)
JP
(1)
JPS5641010B2
(en)
CA
(1)
CA980435A
(en)
FR
(1)
FR2188363B1
(en)
GB
(1)
GB1421370A
(en)
IT
(1)
IT988963B
(en)
Families Citing this family (15)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3942126A
(en)
*
1973-11-18
1976-03-02
Victor Company Of Japan, Limited
Band-pass filter for frequency modulated signal transmission
JPS579530B2
(en)
*
1974-07-08
1982-02-22
US3950704A
(en)
*
1974-09-12
1976-04-13
The United States Of America As Represented By The Secretary Of The Navy
Video retimer system
JPS5175641A
(en)
*
1974-12-26
1976-06-30
Kogyo Gijutsuin
BOSEIZA ISOSEIBUTSU
JPS524157A
(en)
*
1975-06-02
1977-01-13
Nec Corp
Carrier regenerator
US4032852A
(en)
*
1976-01-02
1977-06-28
Rca Corporation
Filter which tracks changing frequency of input signal
JPS5366353A
(en)
*
1976-11-08
1978-06-13
Nec Corp
Carrier reproducer
US4114111A
(en)
*
1977-05-23
1978-09-12
Winters Paul N
Constant phase delay network having a coherent reference
JPS54100639A
(en)
*
1978-01-26
1979-08-08
Fujitsu Ltd
Band-pass filter circuit
US4316108A
(en)
*
1979-09-25
1982-02-16
Rogers Jr Walter M
Tracking filter for FM threshold extension
JPS5669381A
(en)
*
1979-11-07
1981-06-10
Showa Alum Ind Kk
Corrosion inhibitor of aluminum and its alloy
US4731587A
(en)
*
1985-12-10
1988-03-15
Hughes Aircraft Company
Enhanced quadrature notch filter
JPH078543A
(en)
*
1993-06-28
1995-01-13
Iwao Hishida
Sterilizing, disinfecting, and deodorizing composition
US7634243B1
(en)
2002-06-19
2009-12-15
Microtune (Texas), L.P.
System and method for providing a dual conversion tuner having a first IF filter without fixed center frequency
US7886239B2
(en)
*
2005-08-04
2011-02-08
The Regents Of The University Of California
Phase coherent differtial structures
Family Cites Families (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR1224933A
(en)
*
1958-02-18
1960-06-28
Gen Dynamics Corp
Frequency selection circuit
US3375451A
(en)
*
1965-06-17
1968-03-26
Nasa Usa
Adaptive tracking notch filter system
US3458823A
(en)
*
1967-03-20
1969-07-29
Weston Instruments Inc
Frequency coincidence detector
US3593150A
(en)
*
1969-12-03
1971-07-13
Kakusai Denshin Denwa Kk
Phase- and frequency-fluctuation included in a transmitted signal
JPS5323659B1
(en)
*
1970-08-04
1978-07-15
1972
1972-06-14
JP
JP5915372A
patent/JPS5641010B2/ja
not_active
Expired
1973
1973-06-12
US
US00369254A
patent/US3805173A/en
not_active
Expired – Lifetime
1973-06-12
IT
IT25099/73A
patent/IT988963B/en
active
1973-06-13
CA
CA173,991A
patent/CA980435A/en
not_active
Expired
1973-06-13
GB
GB2824273A
patent/GB1421370A/en
not_active
Expired
1973-06-14
FR
FR7321646A
patent/FR2188363B1/fr
not_active
Expired
Also Published As
Publication number
Publication date
US3805173A
(en)
1974-04-16
FR2188363A1
(en)
1974-01-18
DE2330357B2
(en)
1976-07-29
JPS5641010B2
(en)
1981-09-25
JPS4918550A
(en)
1974-02-19
DE2330357A1
(en)
1974-01-03
IT988963B
(en)
1975-04-30
CA980435A
(en)
1975-12-23
FR2188363B1
(en)
1976-05-07
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Legal Events
Date
Code
Title
Description
1976-05-26
PS
Patent sealed [section 19, patents act 1949]
1993-07-14
PE20
Patent expired after termination of 20 years
Effective date:
19930612
