IT961484B - Perfezionamento nei filtri ad onde acustiche superficiali ad esempio filtri a frequenza intermedia per televisione - Google Patents

Perfezionamento nei filtri ad onde acustiche superficiali ad esempio filtri a frequenza intermedia per televisione

Info

Publication number
IT961484B
IT961484B IT5163672A IT5163672A IT961484B IT 961484 B IT961484 B IT 961484B IT 5163672 A IT5163672 A IT 5163672A IT 5163672 A IT5163672 A IT 5163672A IT 961484 B IT961484 B IT 961484B
Authority
IT
Italy
Prior art keywords
filters
television
improvement
acoustic wave
intermediate frequency
Prior art date
Application number
IT5163672A
Other languages
English (en)
Italian (it)
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of IT961484B publication Critical patent/IT961484B/it

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6423—Means for obtaining a particular transfer characteristic
    • H03H9/6426—Combinations of the characteristics of different transducers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Transducers For Ultrasonic Waves (AREA)
IT5163672A 1971-07-22 1972-07-19 Perfezionamento nei filtri ad onde acustiche superficiali ad esempio filtri a frequenza intermedia per televisione IT961484B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3436871A GB1357193A (en) 1971-07-22 1971-07-22 Acoustic surface wave devices

Publications (1)

Publication Number Publication Date
IT961484B true IT961484B (it) 1973-12-10

Family

ID=10364774

Family Applications (1)

Application Number Title Priority Date Filing Date
IT5163672A IT961484B (it) 1971-07-22 1972-07-19 Perfezionamento nei filtri ad onde acustiche superficiali ad esempio filtri a frequenza intermedia per televisione

Country Status (7)

Country Link
AU (1) AU4461772A (es)
DE (1) DE2233137A1 (es)
ES (1) ES405007A1 (es)
FR (1) FR2146823A5 (es)
GB (1) GB1357193A (es)
IT (1) IT961484B (es)
NL (1) NL7209887A (es)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2319245A1 (fr) * 1975-07-24 1977-02-18 Thomson Csf Transducteur perfectionne pour filtre a ondes de surface a fonction de transfert asymetrique et filtre comportant un tel transducteur
FR2328323A1 (fr) * 1975-10-17 1977-05-13 Thomson Csf Transducteur pour filtre a ondes de surface a diffraction reduite, et filtre comportant un tel transducteur
GB1554366A (en) * 1977-02-04 1979-10-17 Philips Electronic Associated Acoustic surface wave devices
FR2447644A1 (fr) * 1979-01-26 1980-08-22 Thomson Csf Transducteur d'ondes elastiques de surface et filtre comprenant un tel transducteur
WO1980002091A1 (en) * 1979-03-21 1980-10-02 Inst Radiotekh Elektron Filter based on the use of surface acoustic waves
US4321567A (en) * 1980-03-24 1982-03-23 Raytheon Company Combining series sections weighting with withdrawal weighting in SAW transducers
GB2120891B (en) * 1982-05-25 1986-07-02 Plessey Co Plc Interdigital transducer
KR900008524B1 (ko) * 1987-08-19 1990-11-24 삼성전자 주식회사 위성수신기의 지대지간섭 제거를 위한 탄성표면파 필터
EP0489195A1 (de) * 1990-12-05 1992-06-10 SIEMENS MATSUSHITA COMPONENTS GmbH & CO. KG Fernseh-ZF-Filter für Quasi-/Paralleltonanwendungen

Also Published As

Publication number Publication date
GB1357193A (en) 1974-06-19
NL7209887A (es) 1973-01-24
ES405007A1 (es) 1975-07-01
FR2146823A5 (es) 1973-03-02
AU4461772A (en) 1974-01-24
DE2233137A1 (de) 1973-02-08

Similar Documents

Publication Publication Date Title
IT973518B (it) Perfezionamento nei forni a radio frequenza
IT1041435B (it) Dispositivo ad onde acustiche superficiali particolarmente filtro selettore di frequenza
NL7514959A (nl) Akoestisch oppervlaktefilter.
IT945663B (it) Perfezionamento negli altoparlanti per frequenze medie
CA972834A (en) Acoustic surface wave filter
NL172810C (nl) Filter met akoestische oppervlakte-golven.
IT990300B (it) Perfezionamento negli oscillatori ad onde superficiali
IT972504B (it) Perfezionametno nei trasduttori elettroacustici
CA952233A (en) Acoustic surface wave apparatus
IT961484B (it) Perfezionamento nei filtri ad onde acustiche superficiali ad esempio filtri a frequenza intermedia per televisione
AR193276A1 (es) Filtro electrico a ondas superficiales
IT961468B (it) Filtro ad onda di superficie
JPS51148342A (en) Television if filter with surface acoustic wave principle
IT998646B (it) Disorimenatore di frequenza impiegante filtri non iterativi digitali
AU7398374A (en) Acoustic surface wave devices
IT952392B (it) Perfezionamento nei dispositivi a semi conduttore per micro onde
IT1000767B (it) Filtro elettromeccanico ad onde di superficie
IT975416B (it) Macchina e procedimento per la fabbricazione di sigarette con filtro
FI54852C (fi) Foerfarande och anordning foer framstaellning av filtermaterial foer tobaksroek
NL7507463A (nl) Akoestisch oppervlaktegolf-filter.
IT952541B (it) Perfezionamento nei dispositivi risonanti a cristallo piezoelettri co
IT1052385B (it) Perfezionamento nei trasduttori elettroacustici
IT958874B (it) Filtro a onda di superficie a fre quenza intermedia per ricevitore televisivo a colori
IT965193B (it) Perfezionamento nei trasduttori piezoelettrici
DK135828B (da) Fremgangsmåde ved rensning af en overflade for uopløseliggjort polyvinylalkohol og materiale til brug ved fremgangsmåden.