FR858268A - Improvements to electro-acoustic transmitters and similar devices - Google Patents
Improvements to electro-acoustic transmitters and similar devicesInfo
- Publication number
- FR858268A FR858268A FR858268DA FR858268A FR 858268 A FR858268 A FR 858268A FR 858268D A FR858268D A FR 858268DA FR 858268 A FR858268 A FR 858268A
- Authority
- FR
- France
- Prior art keywords
- electro
- similar devices
- acoustic transmitters
- transmitters
- acoustic
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/025—Magnetic circuit
-
- 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
- G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
- G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
- H04R2209/022—Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB858268X | 1938-05-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR858268A true FR858268A (en) | 1940-11-21 |
Family
ID=10590715
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR858268D Expired FR858268A (en) | 1938-05-04 | 1939-05-01 | Improvements to electro-acoustic transmitters and similar devices |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE434080A (en) |
FR (1) | FR858268A (en) |
NL (1) | NL61472C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339820A2 (en) * | 1988-04-26 | 1989-11-02 | Saad Gabr | Electromagnetic transducer |
-
0
- NL NL61472D patent/NL61472C/xx active
- BE BE434080D patent/BE434080A/xx unknown
-
1939
- 1939-05-01 FR FR858268D patent/FR858268A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0339820A2 (en) * | 1988-04-26 | 1989-11-02 | Saad Gabr | Electromagnetic transducer |
EP0339820A3 (en) * | 1988-04-26 | 1991-03-20 | Saad Gabr | Electromagnetic transducer |
Also Published As
Publication number | Publication date |
---|---|
BE434080A (en) | |
NL61472C (en) |
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