FR2375764A1 - Circuit de filtre - Google Patents

Circuit de filtre

Info

Publication number
FR2375764A1
FR2375764A1 FR7738441A FR7738441A FR2375764A1 FR 2375764 A1 FR2375764 A1 FR 2375764A1 FR 7738441 A FR7738441 A FR 7738441A FR 7738441 A FR7738441 A FR 7738441A FR 2375764 A1 FR2375764 A1 FR 2375764A1
Authority
FR
France
Prior art keywords
filter
differential amplifier
filter arrangement
output
signal
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.)
Withdrawn
Application number
FR7738441A
Other languages
English (en)
Inventor
Rainer Fehr
Pierre-Andre Grandchamp
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.)
F Hoffmann La Roche AG
Original Assignee
F Hoffmann La Roche AG
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 F Hoffmann La Roche AG filed Critical F Hoffmann La Roche AG
Publication of FR2375764A1 publication Critical patent/FR2375764A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/02—Frequency selective networks
    • H03H17/0283—Filters characterised by the filter structure
    • H03H17/0286—Combinations of filter structures
    • H03H17/0289—Digital and active filter structures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

Circuit de filtre comportant un ampificateur différentiel 12 pour former le signal de différence 19 entre un signal d'entrée 11 et un signal 17 qui est obtenu par transmission du signal de sortie 16 du circuit de filtre à travers un circuit de réaction sélectif en fréquence. Le circuit de réaction comprend un filtre numérique 15 qui est connecté à l'amplificateur différentiel 12 par l'intermédiaire d'un convertisseur numérique-analogique 14 et entre la sortie de l'amplificateur différentiel et la sortie du circuit de filtre est monté un convertisseur analogique-numérique 13. Application notamment aux appareils à ultrasons.
FR7738441A 1976-12-22 1977-12-20 Circuit de filtre Withdrawn FR2375764A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1618376A CH610157A5 (en) 1976-12-22 1976-12-22 Filter arrangement

Publications (1)

Publication Number Publication Date
FR2375764A1 true FR2375764A1 (fr) 1978-07-21

Family

ID=4415120

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7738441A Withdrawn FR2375764A1 (fr) 1976-12-22 1977-12-20 Circuit de filtre

Country Status (8)

Country Link
JP (1) JPS5379352A (fr)
CH (1) CH610157A5 (fr)
DE (1) DE2703879A1 (fr)
DK (1) DK571577A (fr)
FR (1) FR2375764A1 (fr)
IT (1) IT1088474B (fr)
NL (1) NL7713734A (fr)
SE (1) SE7714466L (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011878A1 (fr) * 1978-12-04 1980-06-11 F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft Procédé et dispositif pour la détermination de vitesses d'écoulement, ainsi que leur application dans un appareil de diagnostic à ultra-sons
FR2551214A1 (fr) * 1983-08-26 1985-03-01 Centre Nat Rech Scient Procede et dispositif de mesure de la vitesse locale au sein d'un milieu fluide porteur d'inclusions en suspension
FR2580076A1 (fr) * 1985-04-05 1986-10-10 Ggr Ultrasonic
EP0361264A1 (fr) * 1988-09-30 1990-04-04 Siemens Aktiengesellschaft Partie d'entreé numérique pour un appareil ultrasonique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2258057A1 (fr) * 1974-01-16 1975-08-08 Westinghouse Electric Corp

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2258057A1 (fr) * 1974-01-16 1975-08-08 Westinghouse Electric Corp

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0011878A1 (fr) * 1978-12-04 1980-06-11 F. HOFFMANN-LA ROCHE & CO. Aktiengesellschaft Procédé et dispositif pour la détermination de vitesses d'écoulement, ainsi que leur application dans un appareil de diagnostic à ultra-sons
DK153438B (da) * 1978-12-04 1988-07-18 Hoffmann La Roche Fremgangsmaade og apparat til bestemmelse af stroemningshastigheder og anvendelse heraf i et ultralyd-diagnoseapparat
FR2551214A1 (fr) * 1983-08-26 1985-03-01 Centre Nat Rech Scient Procede et dispositif de mesure de la vitesse locale au sein d'un milieu fluide porteur d'inclusions en suspension
FR2580076A1 (fr) * 1985-04-05 1986-10-10 Ggr Ultrasonic
EP0197854A1 (fr) * 1985-04-05 1986-10-15 Cgr Ultrasonic Dispositif d'imagerie par ultrasons
EP0361264A1 (fr) * 1988-09-30 1990-04-04 Siemens Aktiengesellschaft Partie d'entreé numérique pour un appareil ultrasonique
US4975885A (en) * 1988-09-30 1990-12-04 Siemens Aktiengesellschaft Digital input stage for an ultrasound apparatus

Also Published As

Publication number Publication date
DE2703879A1 (de) 1978-07-06
JPS5379352A (en) 1978-07-13
CH610157A5 (en) 1979-03-30
NL7713734A (nl) 1978-06-26
SE7714466L (sv) 1978-06-23
DK571577A (da) 1978-06-23
IT1088474B (it) 1985-06-10

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Legal Events

Date Code Title Description
ST Notification of lapse