[go: up one dir, main page]

GB2077559B - Variable characteristic filters - Google Patents

Variable characteristic filters

Info

Publication number
GB2077559B
GB2077559B GB8115768A GB8115768A GB2077559B GB 2077559 B GB2077559 B GB 2077559B GB 8115768 A GB8115768 A GB 8115768A GB 8115768 A GB8115768 A GB 8115768A GB 2077559 B GB2077559 B GB 2077559B
Authority
GB
United Kingdom
Prior art keywords
variable characteristic
characteristic filters
filters
variable
characteristic
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
GB8115768A
Other versions
GB2077559A (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.)
NAT RES DEV
National Research Development Corp of India
Original Assignee
NAT RES DEV
National Research Development Corp of India
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 to GB8018571A priority Critical patent/GB2077557A/en
Application filed by NAT RES DEV, National Research Development Corp of India filed Critical NAT RES DEV
Priority to GB8115768A priority patent/GB2077559B/en
Publication of GB2077559A publication Critical patent/GB2077559A/en
Application granted granted Critical
Publication of GB2077559B publication Critical patent/GB2077559B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks
    • H03H11/12—Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1291—Current or voltage controlled filters
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06—Measuring blood flow
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/06—Frequency selective two-port networks including resistors

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Hematology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
GB8115768A 1980-06-06 1981-05-22 Variable characteristic filters Expired GB2077559B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8018571A GB2077557A (en) 1980-06-06 1980-06-06 Variable characteristic filters
GB8115768A GB2077559B (en) 1980-06-06 1981-05-22 Variable characteristic filters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8018571A GB2077557A (en) 1980-06-06 1980-06-06 Variable characteristic filters
GB8115768A GB2077559B (en) 1980-06-06 1981-05-22 Variable characteristic filters

Publications (2)

Publication Number Publication Date
GB2077559A GB2077559A (en) 1981-12-16
GB2077559B true GB2077559B (en) 1984-07-11

Family

ID=26275753

Family Applications (2)

Application Number Title Priority Date Filing Date
GB8018571A Withdrawn GB2077557A (en) 1980-06-06 1980-06-06 Variable characteristic filters
GB8115768A Expired GB2077559B (en) 1980-06-06 1981-05-22 Variable characteristic filters

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB8018571A Withdrawn GB2077557A (en) 1980-06-06 1980-06-06 Variable characteristic filters

Country Status (1)

Country Link
GB (2) GB2077557A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3137843A1 (en) * 1981-09-23 1983-03-31 Robert Bosch Gmbh, 7000 Stuttgart FILTER AND DEMODULATION CIRCUIT
DE3618170A1 (en) * 1986-05-30 1987-12-03 Rohde & Schwarz Arrangement for suppressing the transmission frequency of a radio-frequency transmitter at the input of an adjacent receiver
JPS63154163A (en) * 1986-12-18 1988-06-27 富士通株式会社 Ultrasonic cw doppler blood flowmeter
IT1238521B (en) * 1989-11-07 1993-08-18 Marelli Autronica CIRCUIT FOR THE PROCESSING OF THE SIGNAL GENERATED BY AN ELECTROMAGNETIC ROTATION SENSOR WITH VARIABLE RELUCTANCE
JPH0760988B2 (en) * 1993-02-15 1995-06-28 日本電気株式会社 Filter circuit
EP0951144B1 (en) * 1993-07-27 2003-10-01 Fujitsu Limited Filter circuit
US5751185A (en) * 1993-07-27 1998-05-12 Fujitsu Limited Low pass filter circuit utilizing transistors as inductive elements

Also Published As

Publication number Publication date
GB2077559A (en) 1981-12-16
GB2077557A (en) 1981-12-16

Similar Documents

Publication Publication Date Title
DE3175861D1 (en) Variable colour filters
GB2091541B (en) Filter assembly
YU278881A (en) Cigarett filter
JPS5791711A (en) Filter
JPS56121604A (en) Improved filter
GB2082398B (en) Dielectric filter
JPS56163706A (en) Filter
JPS56111081A (en) Filter
GB2080695B (en) Engine-fuel filter
GB2080141B (en) Filter elements
GB2092374B (en) Variable capacitor
JPS5753131A (en) Filter unit
JPS56112112A (en) Adaptive filter
JPS57122913A (en) Filter
GB2088678B (en) Adaptive filter
GB2092825B (en) Variable capacitor
GB2077559B (en) Variable characteristic filters
JPS5759609A (en) Filter
JPS56138380A (en) Filter
GB2067087B (en) Filter
JPS5721809A (en) Filter
JPS5721810A (en) Filter
GB2092372B (en) Variable capacitor
ZA818656B (en) Filter assembly
JPS56153708A (en) Variable resistor

Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930522