FR2373917A1 - Filtre d'ondes de surface elastique - Google Patents
Filtre d'ondes de surface elastiqueInfo
- Publication number
- FR2373917A1 FR2373917A1 FR7736906A FR7736906A FR2373917A1 FR 2373917 A1 FR2373917 A1 FR 2373917A1 FR 7736906 A FR7736906 A FR 7736906A FR 7736906 A FR7736906 A FR 7736906A FR 2373917 A1 FR2373917 A1 FR 2373917A1
- Authority
- FR
- France
- Prior art keywords
- transducer
- wave filter
- surface wave
- elastic surface
- location
- 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.)
- Granted
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
-
- 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
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02874—Means for compensation or elimination of undesirable effects of direct coupling between input and output 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
- H03H9/14517—Means for weighting
- H03H9/1452—Means for weighting by finger overlap length, apodisation
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
Dans le filtre piézoélectrique selon l'invention la longueur de chevauchement des doigts 5 et 6 du transducteur 2 est maximale en un point de ce transducteur qui est plus éloigné de l'autre transducteur, (non représenté et dont l'emplacement est indiqué par la flèche A) que ne l'est le centre du transducteur 2, les longueurs de chevauchement et les pas de ce transducteur 2 variant de façon asymétrique, par rapport audit emplacement, dans des directions d'éloignement et de rapprochement vis-à-vis de l'autre transducteur. Application : filtre IF dans récepteurs de télévision en couleurs.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP51146504A JPS5931890B2 (ja) | 1976-12-08 | 1976-12-08 | 弾性表面波フイルタ |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2373917A1 true FR2373917A1 (fr) | 1978-07-07 |
FR2373917B1 FR2373917B1 (fr) | 1982-03-12 |
Family
ID=15409114
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7736906A Granted FR2373917A1 (fr) | 1976-12-08 | 1977-12-07 | Filtre d'ondes de surface elastique |
Country Status (5)
Country | Link |
---|---|
US (1) | US4223285A (fr) |
JP (1) | JPS5931890B2 (fr) |
DE (1) | DE2754494C2 (fr) |
FR (1) | FR2373917A1 (fr) |
GB (1) | GB1593300A (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55134587A (en) * | 1979-04-05 | 1980-10-20 | Sanyo Electric Co Ltd | Color television receiver |
JPS5648708A (en) * | 1979-09-28 | 1981-05-02 | Hitachi Ltd | Surface elastic wave filter |
US4321567A (en) * | 1980-03-24 | 1982-03-23 | Raytheon Company | Combining series sections weighting with withdrawal weighting in SAW transducers |
JPS5992613A (ja) * | 1982-11-19 | 1984-05-28 | Hitachi Ltd | 弾性表面波装置 |
US4531149A (en) * | 1983-06-24 | 1985-07-23 | Rca Corporation | Digital variable group delay equalizer for a digital television receiver |
GB2157522B (en) * | 1984-04-09 | 1987-08-19 | Philips Electronic Associated | Electrical filter comprising an acoustic surface wave device, and method of manufacturing such a filter |
US4825467A (en) * | 1986-11-25 | 1989-04-25 | International Telesystems, Inc. | Restricted access television transmission system |
US5654774A (en) * | 1995-06-06 | 1997-08-05 | Thomson Consumer Electronics, Inc. | Tuner for digital satellite receiver |
TW353245B (en) * | 1995-06-06 | 1999-02-21 | Thomson Consumer Electronics | Saw filter for a tuner of a digital satellite receiver |
WO2015192143A1 (fr) | 2014-06-13 | 2015-12-17 | Integrated Energy LLC | Systèmes, appareils et procédés de traitement des déchets |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2036374A5 (fr) * | 1969-03-12 | 1970-12-24 | Thomson Csf | |
US3675163A (en) * | 1970-08-26 | 1972-07-04 | Clinton S Hartmann | Cascaded f. m. correlators for long pulses |
GB1499330A (en) * | 1974-09-26 | 1978-02-01 | Plessey Co Ltd | Acoustic surface wave filters |
DE2524649C3 (de) * | 1975-06-03 | 1980-11-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Fernseh-ZF-Filter nach dem Oberflächenwellenprinzip |
US4047130A (en) * | 1976-08-27 | 1977-09-06 | Rockwell International Corporation | Surface acoustic wave filter |
-
1976
- 1976-12-08 JP JP51146504A patent/JPS5931890B2/ja not_active Expired
-
1977
- 1977-12-06 US US05/857,908 patent/US4223285A/en not_active Expired - Lifetime
- 1977-12-07 FR FR7736906A patent/FR2373917A1/fr active Granted
- 1977-12-07 DE DE2754494A patent/DE2754494C2/de not_active Expired
- 1977-12-07 GB GB51012/77A patent/GB1593300A/en not_active Expired
Non-Patent Citations (3)
Title |
---|
EXBK/76 * |
NV8090/73 * |
NV8099/76 * |
Also Published As
Publication number | Publication date |
---|---|
DE2754494A1 (de) | 1978-06-22 |
JPS5931890B2 (ja) | 1984-08-04 |
DE2754494C2 (de) | 1984-01-05 |
US4223285A (en) | 1980-09-16 |
JPS5371548A (en) | 1978-06-26 |
FR2373917B1 (fr) | 1982-03-12 |
GB1593300A (en) | 1981-07-15 |
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